Hydromanicus abdominalis, 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

Hydromanicus abdominalis sp. nov. Figs 3J , 7A-C , 9A

Type material.

Holotype ♂ (pinned), Myanmar, Chin, Chin Hills, Myohaung Camp, 2060 m a.s.l., area of Mt. Victoria, 21°12'N, 93°59'E, 2060 m a.s.l., 3-5.x.2002, at light, leg. W. Mey, photo 43/20 (MfN).

Etymology.

Latin, Hydromanicus abdominalis , adjective of abdomen, named after the contrasting yellow colour of the male abdomen including most of the genitalia structures.

Diagnosis.

The new species is assigned to the H. verrucosus group, as defined by Oláh and Johanson (2008b). In contrast to other members of the group, the male abdomen including genitalia, except inferior appendages, is completely yellow, the endothecal processes are round and not elongate and the harpagones are apically enlarged, flat and twisted. H. scotosius Mey, 1996 (Thailand, Vietnam) seems to be a related species by sharing a similar form of the inferior appendages and the small size of the adults.

Description.

Length of forewing 8.7 mm, wing span 18 mm. Head and thorax black, cephalic warts with black bristles, eyes small, interocular index 1.0, antennae black, longer than forewing length, proepistermal setal wart present, legs black, inner spur of fore-tibiae very small, inner ungues of praetarsi with bundle of black hairs; forewings dark brown, with naked (= without hairs) costal field, fork 1 present (Fig. 9A ), hindwings sparsely covered by brown hairs, fork 1 present. Abdomen with segments I-II black, remaining segments yellow.

Male genitalia (Fig. 7A-C ). Ventral and dorsal part of segment IX narrow; segment X curving dorsad, with short apicodorsal lobes widely separated in dorsal view and with blunt tips in lateral view, lateral sides with spinose margins; inferior appendages black in contrast to other parts of genitalia, as long as phallotheca, coxopodites short and broad at apices, harpagones as long as coxopodites, enlarged apically, flat and twisted; phallic apparatus with phallotheca broad and narrowed subapically, endothecal processes evenly rounded, phallotremal sclerites small, clearly separating endothecal processes at their bases.

Distribution.

Myanmar, Chin Hills

Biology.

Mountainous species with flight period in autumn. Adults are attracted to light.

Figures

Figure 3. Images of adult caddisflies from the Chin Hills. A. Rhyacophila scissoides; B. Rhyacophila parva; C. Glossosoma malayanum; D. Chimarra nahesson; E. Kisaura longispina; F. Diplectrona aurovittata; G. Diplectrona burha; H. Diplectrona sanguana; J. Hydromanicus abdominalis sp. nov., ♂ holotype; K. Hydromanicus seth. Scale bars: 0.2 mm.

Figure 7. Male genitalia (scale: 0.5 mm). Hydromanicus abdominalis sp. nov., ♂ holotype, A. Dorsal, B. Ventral, C. Lateral; Cheumatopsyche janosolahi sp. nov., ♂ holotype, D. Dorsal, E. Lateral, F. Ventral; Hydropsyche athamas G. Lateral, H. Dorsal, J. Ventral.

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.