Palaeopsilotreta succini, 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 : 334-337

Palaeopsilotreta succini sp. nov.

( Fig. 3 )

Type material. Male, ZFMK-TRI000822 , kept in the amber collection of the Museum Zoological Research Museum Alexander Koenig, Bonn , Germany (former Patrick Müller collection, BUB 3865 ); Mid-Cretaceous Burmese amber inclusion; Kachin State, Myanmar. Body well preserved, but a fracture across body impairs viewing. Forewing in dorsal view, hindwing covered dorsally by forewing. Antennae and legs present. Male genitalia visible in ventral view, but one hind leg across genitalia interferes with view .

Etymology. The new species is named after the amber in which the fossil species is embedded.

Diagnosis. Fossil extinct species embedded in mid- Cretaceous Burmese amber. Male bearing bipectinate antennae. In forewing forks I, II, V present, discoidal cell closed. Media M reduced, without base, originating from R 4+5, running to wing margin, simply forked at apex into M 1+2 and M 3+4. Cu 1 running straight, apically bifurcated to fork V (Cu 1a + Cu 1b). Cu 2 simple, running unforked to Cu 1b and further (Cu 2 + Cu 1b) straight to wing margin. In male genitalia harpago small, originating mesally on point of bifurcation of strong and slightly curved coxopodite, dorso-apically covered with irregular, dark spines.

Description. Head:Antennae bipectinate, longer than forewings, consisting of a strong scapus, a small pedicellus and a long flagellum, first half with 13 flagellomeres bipectinate, last half of flagellum slightly toothed and filiform. Each of bipectinate flagellomeres bearing rami on both sides; rami partially significantly longer than flagellomere, basally slender and gradually expanded towards rounded apex. Maxillary palps five-segmented; 1 st segment smaller than 2 nd segment, 3 rd longest segment, 4 th and 5 th segments of about equal length and smaller than 3 rd segment.

Wings: forewing length 6 mm; apical forks I, II and V present, M without base, (pseudo-) originating in R 4+5 and simple forked in M 1+2 and M 3+4. Discoidal cell closed, forks I and II sessile.

Male genitalia: inferior appendages two-segmented. Coxopodites in ventral view uniform, strong and slightly curved towards genital centre. Harpago originating lateromesally on coxopodite, dorso-apically covered with irregular, dark spines.

Figures

FIGURE 3. Palaeopsilotreta succini sp. nov., male holotype, ZFMK-TRI000822. 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. E, bipectinate antenna, five-segmented maxillary palp and compound eye; scale bar = 1.5 mm.