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Description of the Larva of Telebasis Digificollis (Odonata: Zygoptera: Coenagrionidae)

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Description of the Larva of Telebasis Digificollis (Odonata: Zygoptera: Coenagrionidae) See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/250370257 Description of the larva of Telebasis digiticollis (Odonata: Zygoptera: Coenagrionidae) Article in The Canadian Entomologist · February 2005 DOI: 10.4039/N04-046 CITATIONS READS 6 186 2 authors: Rodolfo Novelo-Gutiérrez José Antonio Gómez-Anaya Institute of Ecology INECOL Institute of Ecology INECOL 102 PUBLICATIONS 656 CITATIONS 20 PUBLICATIONS 257 CITATIONS SEE PROFILE SEE PROFILE Some of the authors of this publication are also working on these related projects: Determination of new Odonata species in a Colombian Tropical rainforest: an integrative approach. View project Dragonflies of Tatama NP / Libélulas del PNN Tatamá View project All content following this page was uploaded by Rodolfo Novelo-Gutiérrez on 17 October 2014. The user has requested enhancement of the downloaded file. 61 Description of the larva of Telebasis digificollis (Odonata: Zygoptera: Coenagrionidae) Rodolfo Novelo-Gutiérrez,1 José Antonio Gómez-Anaya Instituto de Ecología, A.c., Departamento de Entomología, Apartado Postal 63, 91070 Xalapa, Veracruz, México Abstract-A detailed description and illustrations of the larva of Telebasis digiticollis Calvert, 1902 are provided. A comparison with other larvae of the genus is made. Telebasis digiticollis is distinguished by I premental seta, 6-7 setae on the labial palp, a well-developed and convex ligula, 7-8 spiniform setae on the lateral margins of the prementum, and forceps-like mal e gonapophyses. The larva of T. digiticollis is more like that of T. boomsmae Garrison, 1994 than like other larvae of the genus. Larvae were found living in a lagoon densely covered by aquatic phanerogams such as Eichhornia sp. (Pontederiaceae) and Typha sp. (Typhaceae). Résumé-Une déscription détaillée et illustrée des larves de Telebasis digiticollis Calvert, 1902 a été faite. Les principales caractéristiques des larves de T. digiticollis sont prémentum avec I soie, palpi avec 6-7 soies palpales, ligula tres développé et convexe, marges latérales du pré­ mentum avec une rangée de 7-8 soies épiniformes et la gonapophyse du miile en forme de for­ ceps. La larve de T. digiticollis est plus proche de celle de T. boomsmae Garrison, 1994 que des autres larves connue du genre. Elles ont été récoltées dan une lagune couverte par des phanéroga­ mes aquatiques tels que Eichhornia sp. (Pontederiaceae) et Typha sp. (Typhaceae). Introduction the criteria of Snodgrass (1954) and Westfall and May (1996). The New World genus Telebasis Selys, 1865 (Odonata: Zygoptera: Coenagrionidae) com­ prises 42 known species (Bick and Bick 1995, 1996; Garrison 1997; Daig1e 2002a, 2002b; Tennessen 2002), 8 of which occur in Mexico Telebasis digiticollis Calvert (Bick and Bick 1995). In spite of the modera te (Figs. 1-8, 10) diversity of this genus, 1itt1e is known about the larval stages. To date, 1arvae of only 6 species Material examined have been described: T. boomsmae Garrison, Six exuviae (5 d', 1 ~, reared), 12 last-instar 1994 (Garrison 1994), T. byersi Westfall, 1957 larvae (4 d', 8 ~). MEXICO. Veracruz: (Westfall 1957), T. demararum (Williamson, Municipio de Emiliano Zapata, Miradores 1917) (Geijskes 1941), T. salva (Hagen, 1861) (l9°29'N, 96°46'W, 1agoon, 1000 m), 2.v.1997, (Needham 1904; Westfall 1957), T. sanguinalis R. Arce lego (1 d', 2 ~, and several young in­ Calvert, 1909 (Geijskes 1943), and T. vulnerata stars); 21.ix.l997, R. Arce leg. (6 ~ and 2 small (Hagen, 1861) (García-Díaz 1938). The larvae instars); 11.v.l999, R. Novelo 1eg. (8 d', 1 ~). of T. corallina (Selys, 1876), T. dominicana Deposited at Colección Entomológica del (Selys, 1857), and T. filiola (Perty, 1834) were Instituto de Ecología, A.C., Xalapa. keyed by Westfall and May (1996), but no for­ mal descriptions were made. In this paper we Description provide the description of the larva of Exuviae and last-instar larvae (Fig. 1) yel­ T. digiticollis Calvert, 1902 based upon reared lowish brown (a1coholic specimens), sorne indi­ specimens. We use the terms epiproct and viduals green when a1ive; larvae stocky with paraprocts for the caudal lamellae, following broad head, a few definite markings on body; abdomen slender, with relatively short caudal lamellae (epiproct and paraprocts). Received 26 May 2004. Accepted I November Head. Almost twice as broad as long and 2004. wider than thorax and abdomen, occipital lCorresponding author margin widely concave, cephalic lobes rounded (e-mail: [email protected]). and covered with short, stout, stiff setae, remainder Can. Entomol. 137: 61-66 (2005) © 2005 Entomological Society of Canada 62 Can. Entomol. Vol. 137,2005 Figs. 1-5. Morphology of the larva of Telebasis digiticollis: 1, dorsal aspect of last-instar larva; 2, right antenna, dorsal view; 3, right (a) and left (b) mandibles, ventrointernal view; 4, maxilla: left galeolacinia, ventral view (a), and detail of the ventral row of teeth and setae of galeolacinia, dorsal view (b); 5, labium: prementum, dorsal view (a), and detail of the left palp, frontoventral view (b). 3 a t eth b ~setae./f : a 5 bL­ of head smooth; compound eyes large, prominent. ventral cusp, molar lobe poorly developed, con­ Antennae 7-segmented (Fig. 2), the third seg­ sisting of one and two small cusps on right and ment the longest; relative length of anten­ left mandibles, respectively. Maxilla: galeo­ nomeres: 0.45, 0.75, 1.0, 0.85, 0.60, 0.40, 0.25; lacinia with six teeth, the three dorsal teeth scape and pedicel bicolored: dark laterally and large and moderately incurved, the ventroapical pale dorsally; antennomeres 3-5 and 7 yellow, tooth the largest, the remaining two ventral the sixth one reddish yellow; apex of each teeth the smallest, appearing merely as robust flagellomere with long delicate setae arranged spines (Fig. 4); maxillary palp incurved, sharply in circ1e. Mandibles (Fig. 3) with five incisor pointed, with sorne stiff long setae on its exter­ cusps and one extra cusp at base of largest nal surface. Labium: prementum-postmentum © 2005 Entomological Society of Canada Novelo-Gutiérrez and Gómez-Anaya 63 Figs. 6-9. Details of the larval morphology of Telebasis species: 6, male gonapophyses of T. digitieollis (a and b) and T. salva (e and á) (a and d, ventral view; b and e, left lateral view); 7, female gonapophyses of T. digiticollis (a, ventral view; b, lateral view); 8, male cerci of T. digitieollis (a-c) and T. salva (d) (a, lateral view; b, dorsolateral view; e and d, dorsal view); 9, dorsolateral view of abdominal segment 4 of T. salva showing the of long setae. a 7 a 8 d articulation reaching anterior rnargin of denticulate apical rnargin and a ventral branch rnesosternurn; prernenturn (Fig. 5) slightly lon­ with a well-developed end hook; rnovable hook ger than Íts widest part, lateral rnargins slightly long and sharply pointed. sinuated and gradually diverging toward apex, a Tborax. Tan, with an inferolateral, longitudi­ row of seven or eight spiniforrn setae on apical nal, light brown band along prothorax and two fifths, one prernental seta only, but with rnesokatepisternurn; pronoturn trapezoidal, pos­ vertical row of four minute setae to each side of tero lateral angles rounded and covered with rnidline; lígula broadly triangular, its border sorne scattered long setae, its posterior rnargin finely serrulate; labial palp with six or seven straight at rniddle. Wing pads reaching basal long setae, its apical lobe divided into a half of abdominal segrnent 4. Legs usually pale, squarely truncate dorsal branch with a finely although sorne specirnens with subapical dark © 2005 Entomological Society of Canada 64 Can. Entomol. Vol. 137,2005 Fig. 10. Caudal appendages (gills) of Telebasis digiticollis: (a) left paraproct, lateral view; (b) epiproct, left lateral view. 10 ring on femora, short (e.g., hind legs scarcely 26, lateral series 19-22; epiproct (Fig. lOb): reaching posterior margin of abdominal seg­ dorsal series 11-13, ventral series 6-7. ment 9); dorsal and ventral borders of femora Measurements (mm). Total length (exclud­ with rows of sparse spiniform setae, profemora ing caudal appendages) 10.5-13.0; abdomen also with row of spiniform setae on anterior 6.3-8.4; maximum width of head 3.2-3.3; hind (external) surface; internal and external borders femur (dorsal) 2.4-2.7; epiproct 3.0-3.6; of tibiae with row of sparse spiniform setae, paraproct 3.2-3.9. apical ends of tibiae with tridentate, scalelike setae; tarsi with robust, spiniform setae on ven­ Remarks tral surface. Telebasis spp. are typical inhabitants of lentic Abdomen. Light brown, with narrow, pale, environments such as ponds, swamps, and la­ middorsal line on segments 4-8, gradually nar­ goons, as well as still waters at stream edges, rowing rearward, lateral margins of segments where floating vegetation grows abundantly; the 1-5 slightly convex, straight on 6-10; posterior larvae are frequently found clinging to the un­ margins of tergites 7-10 and sternites 8-10 derside of Eichhornia Kunth (Pontederiaceae), with a row of spiniform setae, remaining ones Pistia L. (Araceae), and Lemna L. (Lemnaceae) smooth. Male gonapophyses slightly forceps­ species (Dunkle 1990). Sorne authors have re­ like (Fig. 6), sharply pointed, reaching basal ported a high abundance of larvae living in half of sternite 10, with row of four or five these aquatic macrophytes (e.g., T. byersi ventrobasal spiniform setae. Female gona­ (Lounibos et al. 1990) and T. salva (Novelo­ pophyses (Fig. 7) slightly surpassing posterior Gutiérrez et al. 2002)). Larvae of T. digiticollis margin of sternite 10, sharply pointed, lateral were found in a small pond contiguous to a big valvae with ventral row of three or four robust, lagoon; the pond was partially covered by spiniform setae. Male cerci as in Figure 8. Cau­ aquatic phanerogams such as Eichhornia sp.
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