Contributions to Zoology 89 (2020) 373-392 CTOZ brill.com/ctoz
Taxonomy, ecology and distribution of the mosquitoes (Diptera: Culicidae) of the Dutch Leeward Islands, with a key to the adults and fourth instar larvae
Jordy G. van der Beek Naturalis Biodiversity Center, Leiden, the Netherlands [email protected]
Klaas-Douwe B. Dijkstra Naturalis Biodiversity Center, Leiden, the Netherlands
Berry B. van der Hoorn Naturalis Biodiversity Center, Leiden, the Netherlands
Sam P. Boerlijst Institute of Environmental Sciences, Leiden University, Leiden, the Netherlands
Loes Busscher Naturalis Biodiversity Center, Leiden, the Netherlands
Maud L. Kok Naturalis Biodiversity Center, Leiden, the Netherlands
Marieta A.H. Braks Netherlands National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands Francis Schaffner Francis Schaffner Consultancy, Riehen, Switzerland
Gerald J. Davelaar Ministry of Public Health, Social Development and Labour, Sint Maarten, Caribbean Netherlands
Maria Henry Ministry of Public Health, Social Development and Labour, Sint Maarten, Caribbean Netherlands
© van der Beek et al., 2020 | doi:10.1163/18759866-bja10005 This is an open access article distributed under the terms of the cc by 4.0 license. Downloaded from Brill.com09/26/2021 02:03:44AM via free access
Koen Hulshof Netherlands National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands. Public Health Department, Saba, Caribbean Netherlands
Teresa E. Leslie Eastern Caribbean Public Health Foundation, Sint Eustatius, Caribbean Netherlands
Maarten Schrama Naturalis Biodiversity Center, Leiden, the Netherlands Institute of Environmental Sciences, Leiden University, Leiden, the Netherlands
Abstract
Assessing mosquito biodiversity is important for disease surveillance and ecosystem health assessments. Such studies are particularly needed in regions like the Caribbean, which have experienced a series of recent mosquito borne disease outbreaks but received little attention regarding its invertebrate biodiver- sity. Here, we report on results from a mosquito survey on the Dutch Leeward Islands (Sint Eustatius, Sint Maarten and Saba), carried out in April and October 2018, which is the first integrative survey since those conducted by Van der Kuyp (1947) and Wagenaar Hummelinck (1949). Moreover, we present a novel key for adults and fourth instar larvae of the mosquitoes of the Dutch Leeward Islands. Overall, eleven species were recorded, eight on Sint Maarten, five on Saba and two on Sint Eustatius. Two new potential disease vectors, Culex nigripalpus and Aedes taeniorhynchus, were recorded on Sint Maarten. One previously re- corded species, Cx. habilitator, was not retrieved from any of the islands, which is further discussed in the paper. Species indicative of natural forest which previously occurred on all three islands were absent from Sint Eustatius and Sint Maarten but still present on Saba. In contrast, species indicative of human inhabi- tation, Ae. aegypti and Cx. quinquefasciatus, were highly abundant on Sint Maarten and Sint Eustatius and present in low numbers on Saba. Overall, the results of this study emphasize the importance of biodiver- sity surveys and indicate that frequent mosquito inventories may contribute to a better understanding of mosquito community composition and distribution of potential vector species.
Keywords biodiversity assessment – Culex nigripalpus – mosquito survey – Saba – Sint Eustatius – Sint Maarten
Introduction such as dengue, chikungunya, malaria, Zika, Rift Valley and West Nile fever (Rueda, 2008). Mosquitoes (Diptera: Culicidae) present a ma- As a result of anthropogenic disturbance of jor risk for human health worldwide (WHO, mosquito habitats, urbanization, internation- 2017). Not only are they often a nuisance, but al trade and travel and spread of invasive mos- can also serve as vectors for a wide range of hu- quitoes, the distributions of mosquito species man and livestock pathogens causing diseases have exhibited majorDownloaded changes from Brill.com09/26/2021 over the past 02:03:44AM via free access
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Figure 1 Sample sites of mosquitoes on Sint Eustatius, Saba and Dutch Sint Maarten during the 2018 Naturalis expeditions. The sampling methods referred to as “Other” comprise of different manual methods to sample adults and larvae. Sites with a BG-sentinel trap or other sampling method that was within 50 m of a Mosquito Magnet site are not separately shown on this map. Map created with QGIS, basemap. © OpenStreetMap contributors and the GIS user community.
Figure 2 Different habitat types that were sampled during the 2018 survey. Natural habitats: a) Bromelias, b) inflorescences of Heliconia sp. c) rock pool/beach pool, d) crab hole; Semi-natural habitats: e) temporary/permanent pond, Artificial habitats: f) bucket, g) well, h) car tire, i) abandoned swimming pool, j) cistern. Photos courtesy of K.-D.B. Dijkstra, J.G. van der Beek and K. Hulshof.
Downloaded from Brill.com09/26/2021 02:03:44AM via free access 378 VAN DER BEEK et al. extracted reference barcodes are available in Results the “Culicidae Caribbean (MEDLI)” project on BOLD (www.boldsystems.org). A total of 831 adult mosquitoes was trapped To inspect whether the mosquito species and examined during the 2018 survey. The communities differ between the islands and number of larvae was not assessed, because whether the different habitat types contain only a subsample of larvae was collected from different mosquito communities, nonmetric each of the habitats. Eleven species of mos- multidimensional scaling (NMDS) analyses quitoes, belonging to six genera, were record- were conducted in RStudio (version 1.2.5019) ed on all islands combined. Eight species were with R version 3.6.1 (supplementary figs. S1 recorded from Sint Maarten, five from Saba and S2). Results are discussed in the (species and only two from Sint Eustatius (table 1). The specific) sections below. most collected species were Cx. quinquefasci- atus (56 % of adults) and Ae. aegypti (35 % of Taxonomic treatment adults). Aedes taeniorhynchus and Cx. nigri- Species names follow the generic and sub- palpus were recorded for the first time for the generic classification of Harbach & Howard island of Sint Maarten. (2007), except for the species from the tribe There were some notable differences in lar- Aedini (in this case all Aedes and Psorophora val habitat use between species (table 2; sup- species). Nomenclature of the latter follows plementary figs. S1 and S2). Six species were Wilkerson et al. (2015), where most genera are observed only in natural and semi-natural returned to sub-generic status. habitats: Cx. bisulcatus; Cx. habilitator, Cx. ni- gripalpus, De. magnus, Ps. pygmaea and Tx. cf. Construction of morphological guadeloupensis. Some of these species were identification keys observed in a single habitat type only: Cx. bi- To facilitate identification, we constructed a sulcatus only occurred in plant containers, dichotomous, literature-based identification and De. magnus in crab holes. None of the ob- key for the mosquitoes of the Dutch Leeward served species were completely restricted to Islands, which is included after the Discus- artificial habitats, although the occurrence in sion. Aside from the species recorded from semi-natural habitats was rare for the larvae the islands, the invasive mosquito Ae. albopic- of Ae. aegypti and Cx. quinquefasciatus (less tus is included, because it is likely to spread than 9 % of positive sites). across the Caribbean, as well as Ae. tortilis, a species present on the neighboring islands. The key is based on previous keys from the Discussion Caribbean region (Lane, 1953; Van der Kuyp, 1954; Pratt, 1969; Belkin et al., 1970; Darsie et al., Historically, eleven mosquito species were re- 2010; Gustave et al., 2018). Additional charac- corded on the Dutch Leeward Islands. During ters were added from species (re)descrip- the 2018 survey, ten of these were retrieved. In tions, standard reference works and (sub)ge- addition, Ae. taeniorhynchus and Cx. nigripal- neric revisions (Bram, 1967; Berlin, 1969a; pus were recorded for the first time for Sint Berlin & Belkin, 1980). Where possible, the key Maarten. For each of the separate islands the was improved after examination of collection percentage of retrieved species was markedly material from the 2018 survey and material al- lower than in the survey by Van der Kuyp ready present in the collection of Naturalis Bio- (1954). Five (83%) of the previously recorded diversity Center (Leiden, The Netherlands). species were foundDownloaded again on from Saba, Brill.com09/26/2021 six (75%) 02:03:44AM via free access
Table 1 Overview of the mosquito species of the Dutch Leeward Islands. This table includes the results of the 2018 Naturalis survey (●) as well as that of Van der Kuyp (1954) (○) Sint Maarten Saba Sint Eustatius Aedes (Howardina) busckii (Coquillett, 1906) ● ○ Aedes (Ochlerotatus) taeniorhynchus (Wiedemann, 1821) ●1 ●2 Aedes (Stegomyia) aegypti (Linnaeus, 1762) ● ● ● Anopheles (Nyssorhynchus) albimanus Wiedemann, 1820 ● Culex (Culex) bahamensis Dyar & Knab, 1906 ● ○ Culex (Culex) habilitator Dyar & Knab, 1906 ○3 Culex (Culex) nigripalpus Theobald, 1901 ●1 Culex (Culex) quinquefasciatus Say, 1823 ● ● ● Culex (Micraedes) bisulcatus (Coquillett, 1906) ○ ● ○ Deinocerites magnus (Theobald, 1901) ● Psorophora (Grabhamia) pygmaea (Theobald, 1903) ● Toxorhynchites (Lynchiella) cf. guadeloupensis (Dyar & Knab, 1906) ● 1New record for Sint Maarten. 2Record by Cornel et al. (2020). 3Doubtful record, see the discussion.
Table 2 Overview of the habitats used by the different mosquito species of the Dutch Leeward Islands, based only on data from the islands of Sint Eustatius, Sint Maarten and Saba. The table includes the results of the 2018 Naturalis survey (●) as well as that of Van der Kuyp (1954) (○) Natural and semi-natural habitats Artificial habitats inflorescences Bromeliads Heliconia holes Tree Crabholes pools Rock Beach pools ponds Permanent ponds and ditches Temporary Artificial containers and cisterns troughs Wells, Ae. aegypti ○ ● ● Ae. busckii ● ○ ● Ae. taeniorhynchus ● ○ An. albimanus ●1 ○ Cx. bisulcatus ● Cx. bahamensis ● ○ ● Cx. habilitator2 ○ Cx. nigripalpus ● ● Cx. quinquefasciatus ● ● ● De. magnus ● Ps. pygmaea ● Tx. cf. guadeloupensis ● ● 1No larvae were found during this survey. This habitat type represents the most prominent larval habitat of this species on neighboring islands. Downloaded from Brill.com09/26/2021 02:03:44AM 2Doubtful record, see the discussion. via free access
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Smithsonian Institution is needed (National Culex (Culex) bisulcatus (Coquillett, 1906) Museum of Natural History, Washington D.C., Culex bisulcatus was synonymized with Cx. USA – NMNH). americanus (NeveuLemaire, 1902) by Dyar (1928), but restored by Stone (1967) as a valid Culex (Culex) nigripalpus Theobald, 1901 species. Berlin (1969a: 30–34) re-analyzed the Culex nigripalpus has been recorded for the material of Van der Kuyp and concluded that first time from the Dutch Leeward Islands in the material belongs to Cx. bisulcatus. Materi- our survey at two localities on Sint Maarten al from the Leeward Islands matches the topo- (2 ♀, 1 ♂, Rolandus Channel, 18°01’53.9“ N, typic material from Guadeloupe, except for 63°02’17.7” W, April 20th, 2018; 1 ♀, Belvedere, the number of setae on the 9th tergite lobe of 18°03’26.9“ N, 63°02’14.4” W, April 20th, 2018, the male genitalia, which are more numerous next to an open drain and small pond). on those of the Leeward Islands (Berlin, When Van der Kuyp sampled the Rolandus 1969a). Up to now, this taxonomic problem Channel in the late 1940s, Cx. nigripalpus was has not been addressed using modern genetic not observed (Van der Kuyp, 1953, 1954), but analysis. Due to a lack of genetic reference Cx. habilitator was recorded at this locality. material, we were unable to address this prob- The larvae of that species look very similar to lem in the current study. In this study, larvae those of Cx. nigripalpus. Therefore, Cx. nigri- of Cx. bisulcatus were only observed in bro- palpus may have been present during Van der meliads on Saba. The species was previously Kuyp’s inventory but was misidentified as Cx. also recorded on Sint Eustatius and Sint habilitator. Maarten (Van der Kuyp, 1948, 1949, 1953, 1954), but was not retrieved from these locations Culex (Culex) quinquefasciatus Say, 1923 despite considerable efforts. There are two Culex quinquefasciatus is strongly associated possible explanations for this. First, climato- with urbanization, as it prefers artificial con- logical conditions were suboptimal for this tainers and polluted groundwater as larval species during our visit. This may be an expla- habitats (Belkin et al., 1970). The species had nation for Sint Eustatius, where most of the been already introduced into the New World sampled phytotelmata were dry in compari- from Africa before 1800 (Belkin, 1962). As ex- son to the summer when they may be filled pected, Cx. quinquefasciatus was present in with water. Second, the number of bromeliads urban habitats on all three islands. Because of was strongly reduced due to urbanization and the complexity of the Cx. pipiens complex, of recent hurricanes on Sint Maarten (Richard- which Cx. quinquefasciatus is a member, we son et al., 2015), as we observed many brome- did not delve deeper into the identification of liads on fallen branches. Despite sampling this species on the Dutch Leeward Islands. All dozens of bromeliads on Sint Peter Hill and (sub)tropical populations from the New World the South Reward, the only remaining habitat have been considered to be Cx. quinquefascia- on Sint Maarten, no larvae were found. tus although Culex pipiens s.s. was also intro- duced to the Americas (Harbach, 2012). The Deinocerites magnus (Theobald, 1901) two lack clear morphological differences and Adults of De. magnus were collected in or interbreed within their non-native range close to crab holes at several localities on Sint (Cornel et al., 2012). Only a genetic study of Maarten. Van der Kuyp (1948, 1949, 1953, 1954) the Caribbean populations can reveal their identified this species as De. cancer, but it was identity. later identified as De. magnus by Adames
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(1971) after examining Van der Kuyp’s original portoricensis (as mentioned in the identifica- material. Deinocerites cancer has not been re- tion key by Belkin et al. (1970)). This may indi- corded from other islands of the Lesser Antil- cate that Saba hosts two Toxorhynchites spe- les (Gaffigan et al., 2019). cies. On Montserrat where these two species of Toxorhynchites occur, Tx. portoricensis oc- Psorophora (Grabhamia) pygmaea curs only in tree holes and Tx. guadeloupensis (Theobald, 1903) only in bromeliads (Belkin et al., 1970). To fur- Van der Kuyp (1953, 1954) recorded Ps. pyg- ther address this issue and identify the Saba maea from the Rolandus Channel on Sint species with absolute certainty, more refer- Maarten. During the 2018 survey, this species ence material and additional molecular work was not observed at this location, but was are required. found in shallow ponds on a flooded lawn in the Belvedere district, but only during the Overall shifts in mosquito community rainy season. The species is known to require composition on Sint Maarten between 1947 recently flooded plains for their eggs to hatch and 2018 (Belkin et al., 1970), which explains why they Due to its different geological history and were not observed during the dry season. Sint natural habitats, the mosquito fauna of Sint Maarten has lowlands with poorly drained Maarten contains a number of species indic- mineral soils, in strong contrast with the soils ative of lowland freshwater or brackish habi- of Sint Eustatius and Saba which consist of tats, including An. albimanus, Ps. pygmaea, better drained sandy-loam and are more steep and Cx. bahamensis. Well-draining soils, per- (Veenenbos, 1955). This makes it unlikely that manent high groundwater levels and an rainwater pools form long enough for the lar- abundance of land crabs provides the ideal vae of Ps. pygmaea to develop on Sint Eustati- habitat for De. magnus in almost all lowland us and Saba. areas on the island. In addition, during the 2018 survey, we observed Cx. nigripalpus and Toxorhynchites (Lynchiella) cf. guadeloupensis Ae. taeniornhynchus in these habitats, both (Dyar & Knab, 1906) of which we report new for the island of Sint During the 2018 survey, two Toxorhynchites Maarten. There were a number of other no- larvae were collected on Saba. A fourth instar table differences between 1947 and 2018. larva was sampled from a tree hole next to First, the ‘indicators of anthropogenic activi- Ladder Hill Road (17°37’49.9” N, 63°15’11” W) ty’ such as Ae. aegypti and Cx. quinquefascia- and an early instar larva was collected from a tus were very abundant and likely increased bromeliad next to Bud’s Mountain Trail (17°37’ due to a combination of urbanization as a N, 63°14’ W). The characteristics of these spec- result of major population growth (1951: imens are in accordance with the ones men- 1,478 inhabitants vs 2014: 40,552 inhabit- tioned in Augier et al. (2003). Therefore, we ants) and devastation by hurricanes. With assume that these specimens belong to Tx. increasing urbanization, most of the indige- guadeloupensis. This is in line with the finding nous forest is lost and consequently also spe- of a Tx. quadeloupensis larva in July 1949 by cies associated with these habitats, such as Van der Kuyp (1954) in a bromeliad on Mount Cx. bisulcatus. Scenery. However, both of our specimens have a ventral brush on the 10th segment consisting A tale of two islands of 9-10 tufts, which would suggest that the Despite the similarity in geology and natural specimens are more similar to those of Tx. history of the islandsDownloaded of Sint from Brill.com09/26/2021 Eustatius and 02:03:44AM via free access
Saba, we observed a striking difference in the whereas this species was absent from the more current species communities compared with remote wells and cisterns on Saba. Overall, those in 1947. Although both ‘natural forest in- we conclude that the striking dissimilarity in dicators’ (Cx. bisulcatus and Ae. busckii) were mosquito species composition between the is- present on both islands during the 1947 survey lands of Sint Eustatius and Saba may be a com- (carried out in the same time of the year; Van bination of under-sampling, loss of suitable der Kuyp 1954), they are currently absent from habitat, and a difference in mosquito control Sint Eustatius but relatively abundant on Saba. approach. This difference may partly be due to limita- tions in sampling effort on Sint Eustatius, where we have not managed to sample all bro- Key to the adults meliads on the rim of the volcano and the sam- pling campaign lasted only one week during Morphological identification key to the adult the dry season. This makes it difficult to draw mosquitoes of the Dutch Leeward Islands. firm conclusions on the actual loss of species. Alternatively, it may be also be caused by a 1 Proboscis stiff; bent downwards; nar- more pronounced effect of climate change on rowed towards tip ������������������������������������� the natural forest on the volcano of Sint Eusta- ����� Toxorhynchites cf. guadeloupensis tius (621 m asl) compared to Saba (872 m asl), – Proboscis flexible; not bent down- which may have caused the potential mosqui- wards; equal in width or swollen at tip to habitat to have shifted beyond the altitude ����������������������������������������������������������������������2 of the volcano on Sint Eustatius. Indeed, we 2(1) Wings veins with spots of dark and have not observed any water filled phytotel- light scales. Scutellum evenly rounded mata on Sint Eustatius, whereas on Saba most on hind margin; with hairs evenly phytotelmata contained water. To test this hy- spaced. Female: palpi about as long as pothesis and to confirm if these species are re- the length of proboscis. Male: palpi ally absent from Sint Eustatius, additional club-shaped �������Anopheles albimanus sampling is required. The second aspect re- – Wing veins with only dark scales. Scu- garding the difference between these islands is tellum with three lobes on hind mar- the fact that adults of Ae. aegypti and Cx. quin- gin; each lobe bearing a separate group quefasciatus were collected much more fre- of hairs. Female: palpi less than half quently on the island of Sint Eustatius (100% the length of the proboscis. Male: tips of all collections on this island) than on Saba of palpi sometimes swollen, but never (3.6% of all collections on this island). This club-shaped �����������������������������������������������3 may be due to the fact that the vector control 3(2) Postspiracular hairs present. Female: unit is able to visit every household on aver- apex of abdomen blunt, i.e. segment 7 age every 40 days on Saba which is not the case not narrowed, segment 8 short, but not on Sint Eustatius. Sint Eustatius has a popula- retracted �����������������������������������������������������4 tion twice the size of Saba, yet Saba’s vector – Postspiracular hairs absent. Female: control unit is twice the size of that in Sint Eu- apex of abdomen more or less pointed, statius, as a result of budgetary constraints. In i.e. segment 7 narrow, segment 8 short addition, Ae. aegypti has colonized some of the and retracted ���������������������������������������������9 more remote fresh and brackish water wells 4(3) Prespiracular hairs present ��������������������� on Sint Eustatius, including one site which �������������������������������Psorophora pygmaea – Prespiracular hairs absent ���������������������5 was previously inhabited by Cx. bahamensis, Downloaded from Brill.com09/26/2021 02:03:44AM via free access
5(4) Tarsal segments of hind leg completely 12(11) Upperside of abdomen with large bas- dark scaled ��������������������������Aedes tortilis al white bands; each band distinctly – Tarsal segments of hind leg with at longer in the middle than at the sides. least some white scaled markings �������6 Mesepimeron with large patch of 6(5) Upperside abdomen dark without bas- scales medially �������������������������������������������� al white bands �������������������Aedes busckii ���������������������������Culex quinquefasciatus – Upperside abdomen dark with basal – Upperside of abdomen unbanded or at white bands �����������������������������������������������7 most narrow bands, shortest in the 7(6) Proboscis with median white ring...... middle. Mesepimeron without large ����������������������������� Aedes taeniorhynchus patch of scales medially ��������������������������� – Proboscis entirely dark, or with a few ������������������������������������� Culex nigripalpus light scales at tip ���������������������������������������8 13(11) Proboscis with a complete white ring 8(7) Mesonotum with two median grey in middle. Upperside of abdomen with stripes; sides with broad white stripes basal white bands, deepest in the mid- in first half of mesonotum; pattern of dle (forming triangular spots). Tibia of mesonotum pattern forming a lyre hind leg with white stripe on under- shape. Clypeus with white scales...... side. Female: palpi with white mark- ���������������������������������������������Aedes aegypti ings, mesonotum with pattern of white – Mesonotum with one median white scales ��������������������������Culex bahamensis stripe; sides without white stripes on – Proboscis with a usually incomplete first half of mesonotum; pattern of white ring. Upperside of abdomen mesonotum never lyre shaped. Clype- with basal white bands, shortest in the us bare �������������������������� Aedes albopictus middle; sometimes absent. Tibia of 9(3) Antenna much longer than proboscis; hind leg without white stripe on un- flagellar segment 1 twice as long as derside. Female: palpi entirely dark clypeus and distinctly longer than seg- scaled, without white markings, me- ment 2 ������������������ Deinocerites magnus sonotum without white scales ��������������� – Antenna shorter than proboscis; flagel- ���������������������������������������Culex habilitator lar segment 1 of antenna subequal or shorter than clypeus and about the same length as second ��������������������������10 Key to the fourth-instar larvae 10(9) Thorax with at most with a few scales along sternopleuron (stp) bristles. Morphological identification key to the fourth Male: palpi about one third the length instar larvae of mosquitoes of the Dutch Lee- of proboscis ����������������� Culex bisulcatus ward Islands. – Thorax with distinct scale patches on 1 Respiratory siphon absent; at least sternopleuron (stp). Male: palpi at some abdominal terga with seta 1 pal- least as long as proboscis ����������������������11 mate ���������������������Anopheles albimanus 11(10) Hind legs entirely dark scaled, without – Respiratory siphon present as a strong- distinct pale ring over joints of tarsal ly chitinized air-tube on segment 8; segments �������������������������������������������������� 12 seta 1 on abdominal terga never pal- – Hind legs with distinct pale ring over mate �������������������������������������������������������������2 joints of tarsal segments, sometimes 2(1) Respiratory siphon without pecten very narrow ���������������������������������������������� 13 teeth; comb scales absent, replaced by Downloaded from Brill.com09/26/2021 02:03:44AM via free access
a large sclerotized plate bearing hairs 11(10) Comb scale with a prominent single �����Toxorhynchites cf. guadeloupensis denticle, with strong preapical spines – Respiratory siphon with pecten teeth; on sides, giving it a trident like shape comb scales present ��������������������������������3 ���������������������������������������������Aedes aegypti 3(2) Respiratory siphon with at least three – Comb scale with a single denticle, tufts ������������������������������������������������������������� 4 with a lateral fringe of fine spicules – Respiratory siphon with only a single ��������������������������������������� Aedes albopictus tuft ��������������������������������������������������������������� 9 12(10) Saddle on segment 10 forms an incom- 4(3) Head widest at about the level of base plete ring; ventral brush with five or six of antennae; abdominal segment 10 pairs of hairs; comb scales long and with two separated sclerotized plates slender ��������������������������������Aedes busckii ������������������������������� Deinocerites magnus – Saddle on segment 10 forms a com- – Head widest in posterior half; abdomi- plete ring; ventral brush with seven to nal segment 10 with a single sclero- nine pairs of hairs; comb scale broad tized plate ��������������������������������������������������5 ��������������������������������������������������������������������13 5(4) Setae of thorax and abdomen stellate 13(12) Saddle on segment 10 with small spic- ����������������������������������������Culex bisulcatus ules on caudal fifth. Lateral abdominal – Setae of thorax and abdomen not stel- hair (6) on segment 3 to 5 usually triple late �������������������������������������������������������������� 6 (double to 5-branched ������������������������������ 6(5) Respiratory siphon with six aligned �����������������������������Aedes taeniorhynchus tufts; a single pair of anal gills ���������������� – Saddle on segment 10 smooth on cau- ������������������������������������ Culex bahamensis dal fifth. Lateral abdominal hair (6) on – Respiratory siphon with three to four segment 3 to 5 usually single ������������������ setae or tufts placed lineally, with one �����������������������������������������������Aedes tortilis seta or tuft dorsally out of line; two pairs of anal gills ��������������������������������������7 7(6) Siphon index less than 5 �������������������������� Conclusion �������������������������� Culex quinquefasciatus – Siphon index at least 5.5 ����������������������� 8 Here we report on the results of a mosquito 8(7) Tufts on respiratory siphon single or survey of the Dutch Leeward islands (Sint double (apical tuft rarely triple �������������� Maarten, Sint Eustatius and Saba) carried out ������������������������������������� Culex nigripalpus in 2018 which was the first extensive survey – Tufts on respiratory siphon double or since 1949. Using a variety of collection meth- triple �����������������������������Culex habilitator ods, we observed two new disease vector spe- 9(3) Ventral brush of segment 10 covers al- cies for the island of Sint Maarten, Ae. taenio- most the full length of this segment ����� rhynchus and Cx. nigripalpus, vectors for ������������������������������ Psorophora pygmaea dog heartworm (Manrique-Saide et al., 2010) – Ventral brush of segment 10 covers and West Nile virus (Barrera et al., 2008), re- less than half of length of this segment spectively. One previously recorded species, ��������������������������������������������������������������������10 Cx. habilitator was not observed. We did not 10(9) Comb scales arranged in a single row find Ae. albopictus. The species richness of ���������������������������������������������������������������������11 the mosquito fauna of Sint Eustatius seems to – Comb scales arranged in multiple rows have decreased compared to previous surveys or a patch �������������������������������������������������12 and is currently dominated by Ae. aegypti and Downloaded from Brill.com09/26/2021 02:03:44AM via free access
Cx. quinquefasciatus, of which the former has References also colonized some of the more remote (even brackish) locations previously inhabited by the Adames, A.J. (1971) Mosquito studies (Diptera, Cu- native Cx. bahamensis. In contrast, the fauna licidae). XXIV. A revision of the crabhole mos- on Saba has remained quite similar compared quitoes of the genus Deinocerites. Contrib. Am. to the 1949 survey (Van der Kuyp, 1954), with Entomol. Inst. 7, 1–154. a species pool dominated by species charac Arnell, H.J. (1976) Mosquito Studies (Diptera, Cu- teristic of relatively undisturbed forests. Re- licidae) XXXIIL A Revision of the scapularis sults of this study emphasize the need for regu- group of Aedes (Ochlerotatus). Contrib. Am. En- lar species inventories of mosquitoes in the tomol. Inst. 13, 1–144. Caribbean. Augier, L.M., Juri, M.J.D. & Molina, G.A. (2003) Re- descripción de la larva y la pupa de Toxo- rhynchites (Lynchiella) guadeloupensis (Diptera: Culicidae). Rev. la Soc. Entomológica Argentina Acknowledgements 62, 99–106. Barrera, R., Bingham, A.M., Hassan, H.K., Amador, We are greatly indebted to a number of peo- M., Mackay, A.J. & Unnasch, T.R. (2012) Verte- ple without whom this study would not have brate hosts of Aedes aegypti and Aedes mediovit- been possible. We are particularly grateful to tatus (Diptera: Culicidae) in rural Puerto Rico. J. everyone on the islands for great logistical Med. Entomol. 49, 917–921. support, especially Clarisse Buma on Sint Eu- Barrera, R., Hunsperger, E., Muñoz-Jordán, J.L., statius and Randall Johnson on Saba. Special Amador, M., Diaz, A., Smith, J., Bessoff, K., Be- thanks to Delia Goilo from the Curaçao Bio- itran, M., Vergne, E., Verduin, M., Lambert, A. & medical & Health Research Institute and Em- Sun, W. (2008) Short report: First isolation of ily Khazan from the School of Natural Re- West Nile virus in the Caribbean. Am. J. Trop. sources and Environment at University of Med. Hyg. 78, 666–668. Florida for joining the expedition team for Bass, C.M. & Bass, D. (2011) Aquatic invertebrate one week and providing some indispens- community structure in water-filled bracts of able help. We thank Dr. Yoosook Lee, Dr. Travis Heliconia caribaea (Heliconiaceae) on Saba, Collier and Allison Weakley from the Vector West Indies. Living World, J. Trinidad Tobago Genetics Laboratory of the Department of F. Nat. Club 2011, 60–65. Pathology, Microbiology and Immunology of Belkin, J.N. (1962) The Mosquitoes of the South Pa- the University of California for sharing their cific (Diptera, Culicidae). Vols. 1 and 2. University species records from Saba. This study was sup- of California Press, California. ported by a donation by the Gieskes Strijbis Belkin, J.N. & Heinemann, S.J. (1975) Collection re- fund, the Leiden University LUSTRA+ scholar- cords of the project “Mosquitoes of Middle ship and the Saba Sea & Learn Foundation. America”. 3. Bahama Is. (BAH), Cayman Is. (CAY), We thank Menno Schilthuizen and one anon- Cuba (CUB), Haiti (HAC, HAR, HAT) and Lesser ymous reviewer for the useful comments. Antilles (LAR). Mosq. Syst. 7, 367–393. Belkin, J.N. & Heinemann, S.J. (1976) Collection records of the project “Mosquitoes of Middle Supplementary material America”. 4. Leeward Islands: Anguilla (ANG), Antigua (ANT), Barbuda (BAB), Monserrat Supplementary material is available online at: (MNT), Nevis (NVS), St. Kitts (KIT). Mosq. Syst. 8, https://doi.org/10.6084/m9.figshare.12085773 123–162. Downloaded from Brill.com09/26/2021 02:03:44AM via free access
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Making mosquito taxonomy useful: A stable RECEIVED: 20 JANUARY 2020 | REVISED AND classification of tribe Aedini that balances util- ACCEPTED: 31 MARCH 2020 ity with current knowledge of evolutionary re- EDITOR: R. VONK lationships. PLoS One 10, 1–26.
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