Palaeopsilotreta xiai 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 : 5

Palaeopsilotreta xiai Wichard & Wang, 2017

Fig. 1

Diagnosis

The antennae of males with 10 to 13 bipectinate flagellomeres and last 8 flagellomeres simple, not bipectinate. In forewing: media simple, unbranched. In male genitalia: harpago apically with a crown of three or four short black spines. Palaeopsilotreta xiai is clearly distinguished from P. cretacea sp. nov. by the unbranched media in the forewings, in contrast to P. cretacea sp. nov. which has the media branched in forewings. Furthermore, P. xiai is clearly distinguished from P. burmanica sp. nov. by the harpago which has a crown of short black spines at its distal end in contrast to the two stout apical spines of P. burmanica sp. nov.

Material examined

MYANMAR – Kachin State • 2 ♂♂; exact locality unknown; Mid-Cretaceous Burmese amber inclusion; former Patrick Müller collection, BUB2571 and BUB3101 ; ZFMK-TRI000811 , ZFMK-TRI000812 .

Additions to description

The description and diagnosis of the holotype ( Wichard & Wang 2017) are supplemented with details from two further specimens.

Tibial spur formula 2/4/4 (short spur on front tibia not clearly visible on holotype).

On the apical cubital area in the forewing of the present male (ZFMK-TRI000811) more detail is visible than described in the holotype: Crossvein between Cu1b and Cu2, and crossvein Cu2 to lateral wing margin present.

The male genitalia of the holotype are only visible in ventral view. In the present male (ZFMK- TRI000812) the genitalia are clearly visible through the hyaline wings in dorsal view ( Fig. 1 C–D): Segment X well developed, with bifurcate lobes; pair of subtriangular lobes protruding far forward and covering genital dorsally from above; lateral preanal appendages in dorsal view more digitiform, almost straight and slightly curved posteroventrally, apex rounded, each bearing single long needle; inferior appendages (gonocoxites) 2-segmented, coxopodites cone-shaped, about ¾ rd the length of gonocoxites, harpagoes smaller, elongate and pencil-shaped, each ending in small crown consisting of 3 to 4 short, black spines.

Figures

Fig. 1. Palaeopsilotreta xiai Wichard & Wang, 2017. A. Male with bipectinate antennae in dorsal view (ZFMK-TRI000811). B. Drawing of a forewing. C. Male genitalia in dorsal view (ZFMK-TRI000812). D. Drawing of the male genitalia.