Triassoscelis Evans, 1956

Lambkin, Kevin J., 2020, Revision of the Hylicellidae of the Late Triassic of Queensland (Hemiptera Cicadomorpha: Hylicelloidea), Zootaxa 4790 (3), pp. 525-539 : 530-532

Triassoscelis Evans, 1956

Triassoscelis Evans, 1956: 192 .

Type species. Triassoscelis anomala Evans, 1956 , by original designation.

Emended diagnosis. Tegmen (base not preserved) c. 2.5 times longer than wide (estimate only); post-nodal area very finely punctate, pre-nodal area not well preserved, but some sparse coarser punctation detected; costal margin broadly rounded, apex bluntly rounded; peripheral membrane noticeably wider at CuA; costal space c. 2 times as wide as medial cell, with 2–4 faint, incompletely developed costal veinlets; R and M apparently separating near apex of basal cell; R fork just beyond tegmen length, a short distance before M fork which is aligned with the RA and CuA forks; RA complexly and variably branched; RA 1 directed towards antero-apical margin, with 2 or 3 terminations; RA 2 stem directed towards apical margin, parallel with RP, with 3 or 6 main branches; RA 1 + RA 2 field occupying entire antero-apical margin; RP with 2 main branches; one apical ir, running between last main branch of RA 2 and RP or RP 1; one r-m, proximal to ir, running to M 1+2 just beyond length of intra-medial cell; M variably branched, with 4, 5 or 7 terminations; im between M 1+2 and M 3, or M 2 and M 3a; intra-medial cell long and narrow, more than 3 times longer than wide, occupying a small portion of post-nodal area; CuA fork quite deep; CuA 1 strongly angled at m-cua which joins M 3+4 very near its base; CuA 2 and distal piece of CuA 1 more or less parallel, the CuA 1 cell thus quite broad and parallelogram-like; CuA 1 with 2 or 3 short terminal branches; apical crossvein field not aligned; CuA 2 simple; clavus not preserved.

Notes. Triassoscelis , was placed by Evans (1956), Becker-Migdisova (1962a), Carpenter 1992), and Jell (2004) in the catch-all Scytinopteridae , and by Evans (1961) simply in Cicadelloidea without family attribution. It was transferred to Hylicellidae by Hamilton (1992). Triassoscelis looks to be the sister genus of Crosbella , sharing the wider peripheral membrane at CuA, and the parallelogram-like CuA cell. It differs from Crosbella in having a broader, more squat wing shape with a much more bluntly rounded apex, CuA fork in line with rather than proximal to the M fork, and in less proliferated apical venation, with far fewer crossveins and terminal branches. With Crosbella , it shares the proliferated and variable radial and medial venation, and presence of weakly developed costal veinlets, and is therefore also assigned to the subfamily Vietocyclinae .