Palaeopsilotreta kachini, WICHARD & MÜLLER & XU, 2021

WICHARD, WILFRIED, MÜLLER, PATRICK & XU, CHUN-PENG, 2021, The odontocerid genera Psilotreta and Palaeopsilotreta (Insecta, Trichoptera) embedded in mid-Cretaceous Burmese amber, Palaeoentomology 4 (4), pp. 331-338 : 334

Palaeopsilotreta kachini sp. nov.

( Fig. 2 )

Type material. Male, NIGP175454 , deposited in the Nanjing Institute of Geology and Palaeontology , Chinese Academy of Sciences. Well preserved in mid Cretaceous Burmese amber, Kachin State, Myanmar. Body well preserved, but embedded in turbid and unclear amber. Head and antennae incomplete. Forewing in dorsal view, hindwing overlapping the forewing from ventrally. Legs present. Male genitalia turbid, visible in ventral view .

Etymology. The new species is named after the Kachin State ( Myanmar), where the Burmese amber is found.

Diagnosis. Male bearing bipectinate antennae. In forewing forks I, II, III and V present; media M apically three-branched in M 1 + M 2 and M 3+4. Cu 1 running straight, apically bifurcated to fork V; Cu 2 simple, running unforked to wing margin. Male genitalia with two-segmented inferior appendages; harpago arising laterally in middle from coxopodite and overtopping coxopodite in length.

Description. Head: antennae bipectinate, longer than forewings, consisting of a long scapus, about 2/3 as long as head, a small pedicellus and more than 22 bipectinate flagellomeres, before antennae cut off. Each flagellomere bearing rami on both sides; rami longer than flagellomeres, basally slender and gradually expanded towards rounded apex. Maxillary palps five-segmented; 1 st segment smaller than 2 nd segment, 3 rd and 4 th segments of about equal lengths and longer than 2 nd and 5 th segments, both also of same length.

Wings: forewing with a length of 5.5 mm; forewing venation with apical forks I, II, III and V present, M apically forked in fork III (M 1 + M 2) and M 3+4. Discoidal cell not visible, forks I and II sessile. Crossveins difficult to recognize.

Male genitalia (visible ventrally):inferior appendages two-segmented. Coxopodite elongate, digitiform, in ventro-lateral view basally slender and gradually expanded towards rounded apex. Harpago originating latero-mesally on coxopodite; also basally slender and gradually expanded towards rounded apex and overtop coxopodite. Segments of inferior appendage irregularly hairy and obviously of same lengths. So far as visible: Segment X apparently covering phallic apparatus dorsally with two oblong scales. Lateral preanal appendages (or parameres?) long and straight.

Figures

FIGURE 2. Palaeopsilotreta kachini sp. nov., male holotype, NIGP175454. A, Imago in dorsal view; scale bar = 2 mm. B, Drawing of forewing venation; scale bar = 2 mm. C, Male genitalia embedded in dusty amber; scale bar = 0.3 mm. D, Drawing of inferior appendages; scale bar = 0.3 mm.