Triaenodes mindatensis, Mey & Malicky, 2021

Mey, Wolfram & Malicky, Hans, 2021, Records and descriptions of caddisflies from Natma Taung National Park and adjacent localities in the Chin Hills of Myanmar (Insecta, Trichoptera), Deutsche Entomologische Zeitschrift 68 (1), pp. 139-164 : 139

Triaenodes mindatensis sp. nov. Fig. 9H-L

Type material.

Holotype ♂ (pinned), Myanmar, Chin, Chin Hills, Natma Taung National Park, 2 miles south of Mindat, 1280 m a.s.l., 12.x.2002, at light, leg. W. Mey, genitalia slide Mey 52/20 (MfN).

Etymology.

The specific epithet refers to the name of the type locality near the township of Mindat.

Diagnosis.

In the male genitalia, the new species is closely related to T. trivulcio Schmid, 1994, described from Manipur and T. dusrus Schmid, 1965, described from Yunnan, but differs by the trilobate form of the inferior appendages, which are pointed in T. trivulcio and deeply split in T. dusrus . The forewings of T. mindatensis sp. nov. are brown and bear some dark apical spots. Related species are also T. pentheus Malicky, 2005 and T. menestheus Malicky, 2005, which seem to be widely distributed in South-East Asia ( Malicky 2005). The morphology of the inferior appendages is species specific and represents the main diagnostic feature in separating species in this genus.

Description.

Length of forewing 8 mm. Head and thorax light brown, hairs of setal warts brown, maxilary palpi covered with long grey-brown hairs, labial palpi short, light brown; antennae yellow-brown, scape with longer hairs apically, flagellum smoothly haired, indistinctly flecked on articulations; legs yellow-brown, smooth, spurs 1.2.2; forewings densely clothed by brown hairs, some darker spots at apex extending into fringes, hindwings membranous, apical area with sparse hairs, fork 1 seemingly absent.

Male genitalia (Fig. 9H-L ). Pleural regions of segment IX semi-sclerotised, ventral region projecting caudad, subquadrat in ventral view; pre-anal appendages large, foliaceous, two times longer than wide, somewhat triangular in dorsal view; segment X with long, median process, slightly curved and surpassing tip of segment X; inferior appendages terminating in three lobes, one small middle lobe and larger ventral and dorsal lobes; recurved process of basal plate short, not extending beyond ventral lobes of inferior appendages. Phallic apparatus slender, evenly curved, parallel-sided, with pair of lateral ridges near middle, apical region bulbous, with small endothecal sclerites.

Distribution.

Myanmar, Chin Hills.

Biology.

Sub-mountainous species (1280 m a.s.l.) with flight period in autumn. Adults are attracted by light. The larvae of Triaenodes species are usually inhabitants of stagnant waters.

Figures

Figure 9. Male genitalia (scale: 0.5 mm) and wing venation. A. Wing venation of Hydromanicus abdominalis sp. nov., ♂ holotype (scale: 2 mm); Adicella natmataungensis sp. nov., ♂ holotype, B. Dorsal, C. Phallic apparatus, ventral, D. Lateral; Aplatyphylax pumilus sp. nov., ♂ holotype; E. Lateral, F. Dorsal, G. Ventral; Triaenodes mindatensis sp. nov., ♂ holotype, H. Lateral, J. Dorsal, K. Ventral, L. Inferior appendage, dorsal.