Calvariopsis nana Ruta 2019, sp. nov.
Creators: name: Ruta, Rafał
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scirtidae
Calvariopsis
Calvariopsis nana

description: Calvariopsis nana sp. nov.
(Figs 1V, 24)
Type material. Holotype, male (CMNH): “Taperina \ Brazil \ Acc. No. 2966”.
Diagnosis. The smallest known species of Calvariopsis gen. nov. (TL 1.7 mm), round, blackish, externally resembling C. bituberculata sp. nov. Tergite VIII similar to that of C. brasiliense (Pic) and C. guyanense sp. nov., apical plate with shallow V-shaped emargination flanked with two spine-like processes, covered with setae on posterolateral angles.
Description. Male. Body oval, convex, covered with whitish, suberect setae. Body brown, legs, antennae and mouthparts yellowish. Head very broad, 1.8× wider than width of interocular space, with fine punctation, punctures small, granulate, separated by a 2.0–3.0× diameter of a puncture, eyes moderately large, not protuberant. Pronotum transverse, widest at its base. Disc of pronotum with fine, granulate punctation, punctures separated by ca. 2.0× diameter of a puncture. Posterior margin of pronotum subtly bisinuate. Anterior angles protruding anteriorly, subtriangular, posterior angles obtuse. Scutellar shield subtriangular, covered with subtle punctation. Elytra oblong (left elytron missing in the studied specimen), 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.
Male genitalia. Penis (L 0.40 mm, W 0.09 mm, Fig. 24A) with curved sides, parameroids short, subtriangular, trigonium subtriangular. Tegmen and sternite IX missing in the studied specimen. Tergite VIII (L 0.26 mm, W 0.24 mm, Fig. 24B) with shallow V-shaped emargination of apical margin, two sharp denticles in lateral portions of apical plate and short setae on posterolateral portion, apodemes as long as apical plate, slightly diverging. Tergite IX (L 0.23 mm, W 0.19 mm, Fig. 24C) with membranous apical plate, apical margin covered with short setae, apodemes as long as apical plate, diverging.
Female. Unknown.
Measurements and ratios. Male (n = 1) TL 1.73 mm, PL 0.40 mm, PW 0.90 mm, EL 1.50 mm, EW 1.13 mm, TL/EW 1.53, PW/PL 2.25, EL/EW 1.32, EL/PL 3.75.
Distribution. Known only from the type locality in Brazil.
Etymology. Latin nana = dwarf; a reference to the small size of the species.
Remarks. According to Beal (1979), the specimen is part of a collection bought from Herbert H. Smith in 1906 and probably also collected by him. Taperina is alternatively spelled Taperinha; this is a plantation on the Amazon, 32 km downstream from Santarém. The specimen was probably collected in the 1870s, as Smith began exploration of the Amazon basin in 1874.
description: Published as part of Ruta, Rafał, 2019, Calvariopsis gen. nov., a new genus of Neotropical Scirtidae (Coleoptera: Scirtoidea), pp. 1-41 in Zootaxa 4604 (1) on pages 31-32, DOI: 10.11646/zootaxa.4604.1.1, http://zenodo.org/record/2783674