Calvariopsis bituberculata, Ruta, 2019

Ruta, Rafał, 2019, Calvariopsis gen. nov., a new genus of Neotropical Scirtidae (Coleoptera: Scirtoidea), Zootaxa 4604 (1), pp. 1-41 : 26-27

Calvariopsis bituberculata sp. nov.

( Figs 1Q , 3 D–F, 5B, 20)

Type material. Holotype, male ( MNHG): “ Guyane Francaise \ Mont Grand Matoury \ 2.– 11.10.1995 \ M. Kocian lgt.” . Paratypes. 5 males ( MNHG): same data as holotype .

Diagnosis. Small (TL 1.9–2.0 mm), oval species externally resembling many other species included in group II of Calvariopsis gen. nov. Tegmen with basal apodemes, tergite VIII with narrow but deep U-shaped emargination in median portion of apical plate. Apex of abdominal ventrite 5 with two small tubercles.

Description. Male. Body oval, convex, covered with brownish, suberect setae. Dorsum brown, head slightly lighter than pronotum and elytra, venter brown, legs, antennae and mouthparts yellowish. Head broad, 1.9× wider than width of interocular space, with subtle punctation, punctures small, granulate, separated by 3.0× diameter of a puncture, eyes large, slightly protuberant. Pronotum transverse, widest at its base. Disc of pronotum with fine, granulate punctation, punctures separated by ca. 3.0–4.0× diameter of a puncture. Posterior margin of pronotum subtly bisinuate. Anterior angles protruding anteriorly, subtriangular, posterior angles right-angled. Scutellar shield subtriangular, almost impunctate. Elytra oblong, without traces of longitudinal ridges, widest in the middle of their length, sides curved, regularly converging to apex in posterior 1/3. Humeri well marked. Punctation stronger than on pronotum, punctures elongate, distance between punctures ca. the diameter of a puncture. Abdominal ventrite 5 with two small, subtriangular tubercles ( Figs 3F , 20E ) at apex.

Male genitalia. Penis (L 0.42 mm, W 0.11 mm, Fig. 20A ) relatively wide, with curved sides, parameroids short, curved, with subtriangular apices, trigonium subtriangular, pointed at apex. Tegmen (L 0.34 mm, W 0.15 mm, Fig. 20B ) U-shaped, with apodemes in basal portion, apices of parameres rounded, setose. Sternite IX (L 0.23 mm, W 0.10 mm, Fig. 20B ) elongate oval, with single, relatively short apodeme, apical margin rounded, covered with short, sparse setae. Tergite VIII (L 0.30 mm, W 0.30 mm, Fig. 20C ) with deep, U-shaped emargination in central portion of apical margin, apical margin subtly setose, apodemes as long as apical plate, slightly diverging. Tergite IX (L 0.28 mm, W 0.26 mm, Fig. 20D ) with membranous and relatively narrow apical plate, apodemes as long as apical plate, strongly diverging.

Female. Unknown.

Measurements and ratios. Males (n = 2) TL 1.93–2.00 (1.97) mm, PL 0.43 (0.43) mm, PW 0.97–1.00 (0.98) mm, EL 1.63–1.70 (1.67) mm, EW 1.30–1.33 (1.31) mm, TL/EW 1.45–1.54 (1.50), PW/PL 2.23–2.31 (2.26), EL/ EW 1.25–1.31 (1.27), EL/PL 3.77–3.92 (3.86).

Distribution. Known only from the type locality in French Guiana.

Etymology. The name refers to the presence of paired tubercles on the last abdominal ventrite.

Figures

FIGURE 1. Calvariopsis gen. nov., dorsal view. A) C. borowieci sp. nov., male; B) C. borowieci sp. nov., female; C) C. four- gassiense sp. nov., male; D) C. panamense sp. nov., male; E) C. peruviana sp. nov., Dept. Cusco, male; F) C. peruviana sp. nov., Callanga, male; G) C. peruviana sp. nov., Dept. Junín, male; H) C. picta sp. nov., Callanga, male; I) C. pittieri sp. nov., male; J) C. pittieri sp. nov., female; K) C. sculptipenne (Pic, 1931), female; L) C. venezuelense sp. nov., male; M–O) C. yanay- acuense sp. nov., males; P) C. yanayacuense sp. nov., female; Q) C. bituberculata sp. nov., male; R) C. brasiliense (Pic, 1916), male; S) C. brasiliense, female; T) C. guyanense sp. nov., male; U) C. kawense sp. nov., male; V) C. nana sp. nov., male; W) C. saopaulense sp. nov., male; X) C. wittmeri sp. nov., male; Y) C. sp., Bolivia, female. Scale bars = 1.0 mm.

FIGURE 3. Calvariopsis gen. nov., SEM images of morphological details, A–C) Calvariopsis yanayacuense sp. nov.; D–F) Calvariopsis bituberculata sp. nov. A, D) ventral portion; B, E) head and prosternum; C) mesoventrite, sphaerical cuticular structures are marked with an arrow; F) apical portion of ventrite 5.

FIGURE 20. Calvariopsis bituberculata sp. nov., male. A) penis; B) tegmen and sternite IX; C) tergite VIII; D) tergite IX; E) apex of abdomen. Scale bar = 0.25 mm.