Palaeopsilotreta Wichard & Wang, 2017

Wichard, Wilfried, Espeland, Marianne, Müller, Patrick & Wang, Bo, 2020, New species of caddisflies with bipectinate antennae from Cretaceous Burmese amber (Insecta, Trichoptera: Odontoceratidae, Calamoceratidae), European Journal of Taxonomy 653, pp. 1-17 : 4-5

Genus Palaeopsilotreta Wichard & Wang, 2017

Type species

Palaeopsilotreta xiai Wichard & Wang, 2017 , by monotypy.

Diagnosis

Palaeopsilotreta can be placed in the family Odontoceridae based on the following combination of characters: ocelli absent; spur formula 2/4/4; males with five segmented maxillary palps, first segment without apicomesal nodule, terminal segment not flexible or annulated; mesoscutum with a pair of ovoid setal warts, mesoscutellum covered by a single wart, large, dome-like and ovoid; presence of forewing forks I, II and V in both wings; discoidal cells closed, median and thyridial cells absent. It can be separated from other odontocerid genera by the Cu 2 in the male forewings reaching the wing margin and not being reduced or absent as in all other genera, and by the unique combination of spur formula, number of wing forks in both wings of the males and the absence of a thyridial cell.

Additions to description

Antennae partially bipectinate, about as long as forewings. Rami of bipectinate flagellomeres slim and about as long as flagellomeres. Female antennae simple, not bipectinate. Maxillary palps 5-segmented, terminal segment not flexible or annulate. Head ocelli absent; frontal, antennal and posterior setose warts present ( Fig. 4E ). Pronotum with 2 pronotal setose warts, mesoscutum bearing pair of small setose warts, mesoscutellum with one dome-shaped wart. In fore- and hindwings: forks I, II and V present. In male: media simple, unbranched, running to apical wing margin, or media branched in M1+2 and M3+4. In female: forewing media branched in M1+2 and M3+4. Discoidal cells closed or open, medial and thyridial cells lacking. Tibial spurs: 2/4/4.

Figures

Fig. 4. Palaeopsilotreta xiai Wichard & Wang, 2017. A. Male and possible female in one Baltic amber piece (ZFMK-TRI000815).B. Female with simple, filiform antennae in dorsal view (ZFMK-TRI000816). C. Female genitalia, as far as visible in cloudy amber (ZFMK-TRI000816). D. Drawing of female forewing. E. Head of male (ZFMK-TRI000811) in dorsal view with antennal, posterior and pronotal setose warts (s.w.). — F. P. burmanica sp. nov. (ZFMK-TRI000813), head of male with maxillary palps (mp), labial palps (lp) and basal bipectinate antennae with scapus (sc) and pedicellus (pe).