Lasalleistichus a New Genus of Tetrastichinae (Hymenoptera: Eulophidae) from the Neotropical Region, Including Four New Species
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Journal of Natural History ISSN: (Print) (Online) Journal homepage: https://www.tandfonline.com/loi/tnah20 Lasalleistichus a new genus of Tetrastichinae (Hymenoptera: Eulophidae) from the Neotropical region, including four new species Christer Hansson To cite this article: Christer Hansson (2020) Lasalleistichus a new genus of Tetrastichinae (Hymenoptera: Eulophidae) from the Neotropical region, including four new species, Journal of Natural History, 54:9-12, 621-633, DOI: 10.1080/00222933.2020.1715500 To link to this article: https://doi.org/10.1080/00222933.2020.1715500 Published online: 24 Jan 2020. Submit your article to this journal Article views: 98 View related articles View Crossmark data Full Terms & Conditions of access and use can be found at https://www.tandfonline.com/action/journalInformation?journalCode=tnah20 JOURNAL OF NATURAL HISTORY 2020, VOL. 54, NOS. 9–12, 621–633 https://doi.org/10.1080/00222933.2020.1715500 Lasalleistichus a new genus of Tetrastichinae (Hymenoptera: Eulophidae) from the Neotropical region, including four new species Christer Hansson Scientific Associate, Natural History Museum, London, UK; Biological Museum (Entomology), Lund, Sweden ABSTRACT ARTICLE HISTORY A new genus, Lasalleistichus, is described based on material from Received 2 August 2019 the Neotropical region (Brazil, Costa Rica, Peru). This new genus Accepted 7 January 2020 includes four species: L. albiclava, L. albifasciatus, L. fuscicoxa, Published online 24 January L. longicaulis, all spp. n. and described here. The group is mainly 2020 female based, males are known only for L. albiclava. There is no KEYWORDS biological information available for this group. Brazil; Costa Rica; Peru http://www.zoobank.org/urn:lsid:zoobank.org:pub:82E08F36-E2C4-42FF-AD12-11B49C272AC6 Introduction Even though some crucial papers pertaining to Neotropical Tetrastichinae have been published relatively recently, this group remains very poorly studied in this part of the world. LaSalle et al. (2006) listed 29 genera of the Tetrastichinae from the Neotropical region, but hardly any of them have been revised or otherwise investigated in the Neotropics. However, most genera on the list were treated by LaSalle (1994) in his study on North American genera of this subfamily, thus paving the way for further studies in the Americas. In spite of these recent achievements much remains to be done on the classification at genus level, and even more so at species level. Here a new tetrastichine genus is described, a genus with fore wings with a large fuscous median spot and an elongate gastral petiole, and both features are very uncom- mon in the Tetrastichinae. Lasalleistichus includes four species from Costa Rica, Brazil and Peru. This genus is almost exclusively female based, the male is known only for one of the species. The biology is unknown, and since the host spectrum for the Tetrastichinae as a whole is very extensive, including more than 100 families in 10 orders of insects, mites, spider egg sacks, nematodes, and acting as gall makers and inquilines in galls (LaSalle 1994), speculation on this subject is futile at this stage. Acronyms MZLU: Biological Museum, Entomology, Lund University, Sweden MZUCR: Museo de Zoología, Universidad de Costa Rica CONTACT Christer Hansson [email protected] © 2020 Informa UK Limited, trading as Taylor & Francis Group Published online 24 Jan 2020 622 C. HANSSON NHM: Natural History Museum, London, United Kingdom Terminology The terms used here are the same as used by LaSalle (1994), with the following exceptions or addenda: CC = costal cell; flg = flagellum; Gt1-7 = gastral tergites 1, 2, etc.; HE = eye height; l = length; mesoscutellum is used instead of scutellum; msc = mesoscutum; MS = malar space; mss = mesosoma; ped = pedicel; ppd = propodeum; smg = submedian grooves; sct = mesoscutellum; submedian grooves on mesoscutellum are used instead of submedian lines; w = width. Lasalleistichus, gen. n. Figures 1(a–f), 2(a–e), 3(c–d) Type species Lasalleistichus albiclava, sp. n. Diagnosis. Antennae attached in middle of frons (Figure 1(c)), scape reaching to upper level of, or slightly above level of vertex, pedicel long and slender, female with clava predominantly white (Figure 1(c)); male antenna with F1–F4 with subbasal whorls of setae (Figure 3(c)); ventral plaque on male scape with same pale colour as remaining scape (Figure 3(c)); mesoscutellum with submedian grooves wide apart and diverging towards posterior part, part between grooves smooth or with very fine and weak reticulation (Figure 1(e)), without sublateral grooves, with two pairs of setae, both in posterior one- half of mesoscutellum; fore wing with a large infuscate spot medially (Figure 1(d)); petiole 1.0–2.2× as long as wide, with or without a short anterolateral spine on each side, and with irregular longitudinal carinae on dorsal surface. Description. Antennae in both sexes attached in middle of frons, halfway between anterior ocellusandmouthmargin(Figures 1(c), 3(c)); scape reaching to upper level of vertex, or slightly above this level; pedicel long and slender; female with three funiculars with F1 distinctly longer than F2, and three clavomeres with a weak constriction between C1 and C2 (Figure 1(c)), male with four funiculars and three clavomeres, with a dorso-basal whorl of long setae on F1–F4, setae longer than flagellomere attached to (Figure 3(c)). Head with malar sulcus complete and ±straight; without subocular fovea and genal carina; clypeal margin bidentate (Figure 1(c)); frons shiny with very weak sculpture, with scattered setae below the level of toruli and with a row of setae along eyes; vertex with very weak reticulation; occipital margin rounded. Pronotum with very weak reticulation and shiny, without a transverse carina close to posterior margin of collar. Mesoscutum with an incomplete (present in only posterior part) to complete median groove; with 3 + 3 long and strong adnotaular setae, the two posterior setae attached away from notauli (Figure 1(e)). Axillae advanced half their length in front of transscutal articulation (Figure 1(e)). Mesoscutellum flat with submedian grooves strong, wide apart and diverging strongly towards posterior part (Figure 1(e)); without sublateral grooves; without frenal groove; with 2 + 2 long and strong setae, both attached outside submedian grooves in posterior one-half of mesoscutellum. Dorsellum smooth and JOURNAL OF NATURAL HISTORY 623 Figure 1. (a) Lasalleistichus albiclava, ♀ holotype habitus lateral. (b) L. albifasciatus, ♀ holotype habitus lateral. (c–e) L. albiclava ♀: (c) paratype head frontal; (d) paratype fore wing; (e) holotype habitus dorsal. (f) L. albifasciatus, ♀ holotype habitus dorsal. Scales: (a–b, e–f) 1 mm; (c–d) 0.5 mm. 624 C. HANSSON Figure 2. (a) Lasalleistichus albiclava, ♂ paratype habitus lateral. (b) L. fuscicoxa, ♀ holotype habitus lateral. (c) L. longicaulis, ♀ holotype habitus lateral. (d) L. albiclava, ♂ paratype habitus dorsal. (e) L. fuscicoxa, ♀ holotype habitus dorsal. Scale 1 mm. shiny, without median carina or groove. Propodeum with a wide and short fovea just behind dorsellum and a complete and strong narrow median carina that expands to a triangular shape posteriorly; without paraspiracular carinae; spiracles large and not covered by a flap; callus with 2–3 setae. Coxae with very weak reticulation. Fore wing with a large infuscate spot JOURNAL OF NATURAL HISTORY 625 Figure 3. (a) Palmistichus ixtlilxochitli, ♀ nontype habitus lateral. (b) Agmostigma frontale, ♀ holotype habitus lateral. (c) Lasalleistichus albiclava, ♂ paratype head lateral. (d) L. longicaulis, ♀ holotype habitus dorsal. Scales: (a–b, d) 1 mm; (c) 0.5 mm. medially; with 3–4 setae on the dorsal surface of a submarginal vein; postmarginal vein absent; costal cell very narrow, 17–32× as long as wide; speculum open below and towards thebaseofthewing.Petiole1.0–2.2× as long as wide, with or without a short anterolateral spine and with irregular longitudinal carinae on the dorsal surface. Gaster 1.7–1.9× as long as 626 C. HANSSON wide, with longest cercal seta 2.4–3.0× as long as next longest (these ratios shall be regarded with some caution as curved setae are difficult to measure), and curved or sinuate but never kinked. Female hypopygium reaching half the length of gaster. Distribution. New World tropics, from Costa Rica to Brazil. Hosts/biology. Unknown. Etymology. Named after John La Salle, friend and fellow eulophid taxonomist who had a special interest in the Tetrastichinae. Gender masculine. Key to species (females) 1. Petiole 2.2× as long as wide (Figure 3(d)) ..... ..... L. longicaulis sp. n. (male unknown) Petiole at most 1.3× as long as wide .......................................................................................... 2 2. Fore coxa dark brown to black (Figure 2(b)) ........ L. fuscicoxa sp. n. (male unknown) Fore coxa predominantly white (Figure 1(a,b)) ...................................................................... 3 3. Gt1 with a white band along the posterior margin (Figure (1b,f)) ....................................... ........................................................................................... L. albifasciatus sp. n. (male unknown) Gaster completely dark (Figure 1(a,e)) .......................... L. albiclava sp. n. (male known) Lasalleistichus albiclava, sp. n. (Figures 1(a,c–e), 2(a,d), 3(c)) Diagnosis. Mesoscutum ±flat with engraved and weak reticulation (Figure 1(e)); fore and mid coxae completely white (Figure 1(a)); propodeum with weak reticulation