Priscoflata subvexa, Szwedo & Stroiński & Lin, 2013

Szwedo, Jacek, Stroiński, Adam & Lin, Qi-Bin, 2013, Discovery of a Flatidae planthopper (Hemiptera: Fulgoromorpha) in the Paleocene of Northern Tibet and its taxonomic and biogeographic significance, Geodiversitas 35 (4), pp. 767-776 : 769

Priscoflata subvexa n. sp.

( Figs 1 A-C; 2)

TYPE MATERIAL. — Holotype. Imprint of tegmen with clavus missing, clavus broken along the claval (CuP) vein. Specimen NIGP 135803 deposited in the collection of the Nanjing Institute of Geology and Palaeontology , Chinese Academy of Sciences, Nanjing, China.

LOCALITY AND HORIZON. — Gangni Village, Anduo County, Dazhuoma area of the Qiangtang Basin in northern Tibet ; Niubao Formation, Paleocene.

DIAGNOSIS. — Stem Sc+R forked distinctly more basal than stem M; branch M 1+2 forked slightly basad of branch M 3+4; stem CuA forked slightly apicad of stem M 3+4 forking. Cell C1 twice as long as cell C3; cell C3 about 1.8 times as long as cell C5. Apical cells distinctly longer than wide, about 3.5 times as long as wide, longer in median portion.

ETYMOLOGY. — Specific epithet is derived from Latin subvexus meaning sloping up.

DESCRIPTION

Total length of tegmen 10.9 mm, maximum width about 5.48 mm (clavus missing, therefore the figure is estimated). Tegmen with costal margin arcuate, distinctly curved at base; anteroapical angle widely rounded; posteroapical angle rounded, apical margin mildly rounded. Apex of clavus exceeding ¾ of tegmen length, postclaval margin (tornus) absent. Bulla present, at the level of stem Sc+R forking. Costal margin distinctly thickened. Costal area present, tapering apicad; costal area as wide as costal cell, with dense veinlets; apex of costal area distinctly basad of claval apex. Costal cell with few transverse veinlets. Basal cell about twice as long as wide. Stems Sc+R, M and CuA leaving basal cell separately, stems Sc+R and M leaving basal cell very close each other. Stem Sc+R short, stem Sc+RA forked at level of costal area apex, reaching the margin with 4 terminals; branch RP distinctly curved mediad at base, forked apicad of stem M 1+2 forking and basad of stem M 3+4 and stem CuA forkings; branch RP forked slightly apicad of costal area apex, reaching margin with 6 terminals. Stem M about 3 times as long as stem Sc+R, shorter than half of stem CuA. Branch M 1+2 forked slightly basad of branch M 3+4; branch M 1 forked again, basad of branch M 2 forking; branch M 2b with a short common portion with branch M 3a; branch M 3+4 forked slightly basad of stem CuA forking; branch M 3 forked slightly basad of common portion with branch M 2b; branch M 4 forked slightly apicad of branch M 3 forking; Stem M reaching apical margin with 19 terminals; some branches of M forked apicad of apical line of veinlets. Stem CuA straight and parallel to the claval suture (CuP); stem CuA the longest, forked apicad of branches RP, M 1+2 and M 3+4 forkings; branch CuA 1 forked again basad of apical line of transverse veinlets; branch CuA 2 single. Cell C1 the longest, about twice as long as cell C3; Cell C3 delimited posteriorly by a transverse veinlet of the first corial row; cell C5 shorter than cell C3, anterocubital cell with a few transverse veinlets.First corial row of veinlets (r-m, im and m-cua) at level branchs M 1+2, M 3+4 and CuA forkings. Distal portion of intermedial space between branches M 1b and M 2a with a few less regular veinlets forming a net. No veinlets between CuA and CuP and between branch CuA 2 and postclaval margin (tornus). Apical cells distinctly longer than wide, about 3.5 times as long as wide, longer in median portion.

Figures

FIG. 1. — Priscoflata subvexa n. gen., n. sp.: A, B, tegmen in various light conditions; C, basal portion of tegmen with area of bulla indicated; D, apical half of tegmen with common portion of veins M2b and M3a indicated. Holotype, specimen No. NIGP 135803. Scale bars: 1 mm.