Arctopsyche subflava, 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

Arctopsyche subflava sp. nov. Figs 4B , 6D, E

Type material.

Holotype ♂ (pinned), Myanmar, Chin, Chin Hills, 9 miles west of Mindat, 21°22'N, 93°55'E, 1960 m a.s.l., 9.x.2002, at light, leg. W. Mey (MfN).

Etymology.

Latin, subflavus, pale yellow (adjective), named after the pale-yellow band along the termen and dorsal margin of forewings.

Diagnosis.

The new species shares with A. inaequispinosis Schmid, 1968 (described from Sikkim) 1) the pale-yellow band on the forewings and 2) a similar architecture of the male genitalia. The species differ in the form of the bifid intermediate appendages, with longer dorsal branches in A. subflava sp. nov. and longer ventral branches in A. inaequispinosus . The second segment of the inferior appendages has a prominent ventral keel in the new species, whereas this keel is inconspicuous and flat in A. inaequispinosus . Both species form a species pair in the A. composita group (sensu Schmid 1968) with allopatric distribution ranges in the Himalayas ( A. inaequispinosus ) and Chin Hills ( A. subflava sp. nov.).

Description.

Forewing length 14 mm, wing span 30 mm. Head and antennae pale yellow, eyes large, hemispherical, cephalic dorsal warts with pale yellow hairs, hairs on occiputal warts black, labial and maxillary palpi brown; mesonotum dark brown laterally and with median, pale yellow band bearing short, yellow hairs; tegulae of forewings with long, black hairs, fork 4 very long, starting at the base of the median cell, wing membrane grey, sparsely covered with short black hairs, membrane with pale spots along costal and apical margins, dorsal margins with a broad, pale yellow band extending on termen (= outer margin) towards wing apices, termen somewhat concave; hindwings membranous, costal area covered with short brown hairs, fork 1 with short stalk.

Male genitalia (Fig. 6D, E ). Segment IX with evenly curved anterior margin, segment X membranous, pre-anal appendages free, large and oval, intermediate appendages with long dorsal and short ventral branches, basal part not broader than pre-anal appendages, inferior appendages with short basal and more elongate apical segments, the latter exhibiting a prominent, slender keel on ventral sides, apical portions slightly bent mediad and deeply excised on the median sides subapically; phallic apparatus with tubular phallotheca and erectile membranous endotheca, containing long, sickle-shaped phallotremal sclerites.

Female. Unknown

Distribution.

Only known from the Chin Hills, Myanmar.

Biology.

Mountainous species 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 6. Male genitalia Arctopsyche tricornis A. Lateral, B. Dorsal, C. Ventral; Arctopsyche subflava sp. nov., ♂ holotype; D. Lateral, E. Ventral. Scale bars: 0.5 mm.