Pseudobasidissus Trýzna & Baňař, 2014

Trýzna, Miloš & Baňař, Petr, 2014, Description of a new genus and species, Pseudobasidissus barclayi (Coleoptera: Anthribidae), from east Madagascar, Zootaxa 3869 (2), pp. 180-188 : 181-182

Pseudobasidissus Trýzna & Baňař gen. nov.

( Figs. 1–8 , 10, 12–16 , 18–19 )

Type species. Pseudobasidissus barclayi Trýzna & Baňař sp. nov., by original designation.

Placement. Tribe Platyrhinini Bedel, 1882

Name derivation. Pseudobasidissus, gender masculine, Pseudo- (not real or genuine, false), - basidissus (denoting resemblance to the genus Basidissus ).

Description. Body medium-sized. Head relatively short, eyes of medium size, situated laterally, hemispherical, convex laterally, and well separated from each other, ocular index more than 1.50. Rostrum depressed in the middle part, with distinct longitudinal carina reaching between eyes in both sexes. Lateral margins of rostrum almost parallel in male, slightly expanding anteriorly in female in dorsal view, anterior part emarginate. Antennal scrobes not visible in dorsal view, dorsal margins of scrobes slightly elevated and carinate in their dorsal parts, forming a slightly top-shaped elevation. Scrobes reaching bases of mandibles anteriorly and distant from anterior margin of eyes.

Antennae reaching to posterior margin of pronotum in both sexes. Antennomeres continuously extended apically in both sexes, not forming a distinct antennal club, although this feature is more noticeable in male than female. Basalmost part of scape only hidden in scrobe in dorsal view. Antennomeres V–VIII with conspicuously long appressed setae in both sexes, remaining antennomeres only with very short, soft, dense setae.

Pronotum transverse, widest at dorsal transverse carina, where it is as wide as elytra. Dorsal transverse carina separated from basal margin of pronotum, distinctly bisinuate, convex in the middle. Lateral carina of pronotum deeply emarginate in dorsal view, angulate, in contact with dorsal transverse carina lobe-like. Pronotum with one central distinct tuft of setae.

Elytra broadly suboval to rectangular, narrowed even in distal fifth of length. Each elytron with a distinct hump on humeral part, here with two subbasal erect tufts of setae, and with one smaller antemedian tuft on the fourth elytral interval, one larger postmedian tuft on the second elytral interval and five preapical tufts of setae.

Abdomen shorter than broad, sternites with long, dense appressed setae. Pygidium subquadrate in male ( Fig. 15 ), wider than long in female ( Fig. 16 ).

Differential diagnosis. The new genus resembles the genus Basidissus Fairmaire, 1897 in general appearance, from which it can be distinguished by the morphological characters given in the key below:

1. Rostrum depressed in the middle part, with distinct longitudinal carina. Dorsal margins of antennal scrobes slightly elevated and carinate in their dorsal parts. Scrobes distant from anterior part of eyes. Antennae longer, reaching to posterior margin of pronotum in both sexes or extending slightly beyond this margin in males. Antennomeres continuously extended apically in both sexes, not forming a distinct antennal club. Pygidium subquadrate ( Figs. 15–16 ). Male: internal sac of aedeagus finely serrated, with well differentiated ventral and dorsal lobes, dorsal one beak-shaped, strongly sclerotized ( Figs. 7–8 ). Female: bursa copulatrix ( Figs. 18–19 ) strongly widened basally, almost bilobate, with single sclerotized plate in the central part...................................................................... Pseudobasidissus Trýzna & Baňař gen. nov.

-. Antennomeres I-VIII thin, IX-XI wide, forming distinct antennal club. Pygidium conspicuously narrowing posteriorly, regularly rounded ( Fig. 17 ). Male: internal sac of aedeagus roughly serrated, with ventral lobe only, dorsal lobe missing ( Fig. 9 ). Female: bursa copulatrix ( Figs. 20–21 ) simple, continuously widening apically, with paired sclerotized plate in the central part............................................................................... Basidissus Fairmaire, 1897

Figures

FIGURES 1 – 6. Pseudobasidissus barclayi gen. et sp. nov., male holotype; 1, dorsal habitus; 2, head, dorsal view; 3, right antenna, dorsal view; 4, lateral habitus; 5, abdomen, lateral view; 6, abdomen, ventral view. Scale bars in mm.

FIGURES 7 – 9. 7 – 8, Pseudobasidissus barclayi gen. et sp. nov., male holotype; 9, Basidissus cristatus Fairmaire, 1897, male; 7, aedeagus, lateral view; 8, internal sac of aedeagus, lateral view; 9, aedeagus, lateral view. Scale bars in mm.

FIGURES 10 – 17. 10, 12 – 13, 15, Pseudobasidissus barclayi gen. et sp. nov., male holotype; 11, 17, Basidissus cristatus Fairmaire, 1897, male; 14, 16, Pseudobasidissus barclayi gen. et sp. nov., female allotype; 10 – 11, body of aedeagus, ventral view; 12, segment 8 and sternite 9, ventral view; 13, tegmen, lateral view; 14, hemisternites, ventral view; 15 – 17, pygidium, dorsal view. Abbreviations: os = ostium; st 8 = sternite 8; st 9 = sternite 9; tg 8 = tergite 8. Scale bars in mm.

FIGURES 18 – 21. 18 – 19, Pseudobasidissus barclayi gen. et sp. nov., female allotype; 20 – 21, Basidissus cristatus Fairmaire, 1897, female; 18, 20, bursa copulatrix and spermatheca, ventral view; 19, 21, bursa copulatrix, lateral view. Abbreviations: mov = median oviduct; scpl = sclerotized plate; sp = spermatheca; spd = spermathecal duct; spg = spermathecal gland. Scale bars in mm.