Adicella natmataungensis, 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

Adicella natmataungensis sp. nov. Figs 4J , 9E-G

Type material.

Holotype ♂ (pinned), Myanmar, Chin, Chin Hills, Natma Taung National Park, 8 miles camp, area of Mt. Victoria, 2500 m a.s.l., 6-8.x.2002, at light, leg. W. Mey, genitalia slide Mey 31/20 (MfN).

Paratypes: 3 ♂ 2 ♀ (pinned), photo 31/10, 1 ♂ (in alcohol), same data as holotype (MfN).

Etymology.

The specific epithet refers to the name of the type locality, the summit Natma Taung (= Mt. Victoria).

Diagnosis.

The species does not exhibit a clear similarity to any of the known species of China, the Indian or South East Asian regions. According to male genitalia, the species resembles those of the A. pulcherrima group. However, the external morphological criteria of the group, as listed by Schmid (1994) and Yang and Morse (2000), include a cushion of dense, erect hairs on the jugal lobes of the forewings and a brush of long hairs on the jugum of the hindwings. Both characters are imperfectly present in the new species, with short, erect hairs on the base of the anal vein (but not cushion) and with long hairs on the hindwing jugum representing the normal fringes (but not hair brushes). The long segment X with only one pair of dorsal processes and the widely-diverging apical parts have a similar shape in some species of the group, for example, A. papillosa Yang & Morse, 2000 from south-western China and A. castanea Kimmins, 1963 from Khasi Hills.

Description.

Length of forewings 5.6-6 mm, wing span 13 mm. Head and thorax dark brown, vestiture on setal warts brown, palpi brown, basal segments of antennae and flagellum densely covered by short brown hairs; legs pale brown, spurs 1.2.2; forewings densely covered by brown hairs, maculae absent, jugal area and base of anal veins with short, erect hairs; hindwings sparsely covered by brown hairs, veins darker than membrane, fringes longer than diameter of wings, hair brush on jugal area absent.

Male genitalia (Fig. 9E-G ). Segment IX in lateral view with straight anterior margin and posterior margin with rounded, medial lobe; pre-anal appendages elongate, sub-cylindrical, with long hairs; inferior appendages long, in sub-vertical position, slightly lobed apically on median side, the inner bases with short spicules; segment X valves large, fused dorsally from segment IX to beyond paired dorsal processes, valves widely separated in apical half, deeply excised subapically and pointed at tips. Phallic apparatus with phallotheca curved from broader base, endotheca short, with arched phallotremal sclerite.

Distribution.

Myanmar, Chin Hills.

Biology.

Mountainous species (2500 m a.s.l.) with flight period in autumn. Adults are attracted by light.

Figures

Figure 4. Images of adults from the Chin Hills. A. Hydropsyche pallipenne; B. Arctopsyche subflava sp. nov., ♂ holotype; C. Aplatyphylax pumilus sp. nov., ♂ holotype; D. Micrasema turbo; E. Lepidostoma assamense; F. Lepidostoma serratum; G. Lepidostoma ylesomi; H. Paraphlegopteryx aykroydi; J. Adicella natmataungensis sp. nov., ♂ paratype; K. Poecilopsyche duhchasana. Scale bar: 0.2 mm.

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.