Palaeoglaesum muelleri, Wagner, Rüdiger, 2017

Wagner, Rüdiger, 2017, Synopsis of extinct Bruchomyiinae (Diptera, Psychodidae) from Burmese, Baltic and Dominican amber, with descriptions of new genera and species, Zootaxa 4320 (1), pp. 100-120 : 114-115

Palaeoglaesum muelleri sp. nov.

( Figs. 7a–c )

Etymology. dedication name to Patrick Müller (Käshofen, Germany)

Diagnosis. Palaeoglaesum species with epandrium in lateral view about 2 times longer than gonocoxite, gonostylus curved.

Material. BUB 585 in coll. Müller

Geological stratum. Burmese amber.

State of preservation. Specimen with a coat of long hairs on entire body; head, thorax, abdomen and details of genitalia recognizable, although some abdomen sclerites are unevenly translucent. Wing slightly crumpled. Mid legs missing. Genitalia visible in lateral view.

Syninclusions. None.

Description. Head in lateral view elongate, eyes oval, eye-bridge not developed. Relative length of scape, pedicel and flagellomeres of right antenna: 10-13-38 -29-33-31-31-31-28-25-22-22-22-21.5-20-21; absolute length: 0.06-0.07-0.22-0.17-0.19-0.18-0.18-0.18-0.16-0.14-0.13-0.13-0.13-0.12- 0.11-0.12 mm. Antennae with coat of equally long setae. Ascoids not discernable. Palpus 4-segmented: relative length: 10-30-34 -65; absolute length: 0.06-0.17- 0.19-0.37 mm.

Head length 0.36 mm; length thorax + abdomen 2.97 mm; length genitalia 0.45 mm.

Thorax without specific features. Mid legs missing. Remaining legs with elongate hairs, longest at base of femora, successively shorter towards tarsus. Fore tibia slightly bent, with several bristles along entire length and 5 or more apical bristles. Basal segment of fore leg slightly bent with 2 subapical and at least 5 apical bristles. Hind legs as well but with some bristles. Hairs on front side of front legs considerably longer than hairs on back side; hairs on middle and hind legs shorter than on front legs.

Wing length 2.26 mm. Sc long, terminates in R1 at about middle of wing, short sc-c crossvein. Radial fork very distal of medial fork; first basal cell elongate rectangular, extends almost to middle of wing. R2+3 originates at about middle of first basal cell, R2+3 about 3 times longer than R2. R4 originates from front end, R5 at about middle, M1+2 from rear end of first basal cell. M3 and M4 originate at close quarters from middle of second basal cell; CuA distally curved towards hind wing margin; CuP ends in wing, distally curved towards CuA.

Abdomen with 8 segments and genitalia. Gonocoxites tube shaped, basally wider than distally; gonostyli longer than gonocoxites, slightly bent. Between gonocoxites lies the tube shaped aedeagus; terminally with an elongate distally forked sclerite (distiphallus). Epandrium flat, elongate, cerci elongate oval. Proctiger discernable between cerci, elongate with two dorsal and several distal edges.

Comments. The new species is distinguished by the hair coat of the entire body, shape of gonocoxites and gonostyli, and the shape of the aedeagus with an long distally split distiphallus sclerite; parameres small, not discernable. The long and flat epandrium is in common with the other known species of Burmese amber Bruchomyiinae .

Figures

FIGURE 7. Palaeoglaesum muelleri sp. n. a. genitalia lateral view; b. fore femur; c. fore tibia; Palaeoglaesum notandum sp. n. d. genitalia transverse lateral view; Palaeoglaesum bisulcum sp. n. e. genitalia dorsal view. Abbreviations: ae—aedeagus; ascl—aedeagus sclerite; c—cercus; ep—epandrium; gcx—gonocoxite; gst—gonostylus.