Discovery of a Flatidae planthopper (Hemiptera: Fulgoromorpha) in the Paleocene of Northern Tibet and its taxonomic and biogeographic significance Author Szwedo, Jacek Author Stroiński, Adam Author Lin, Qi-Bin text Geodiversitas 2013 2013-12-27 35 4 767 776 http://dx.doi.org/10.5252/g2013n4a2 journal article 10.5252/g2013n4a2 1638-9395 5373078 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.