Aegidium atlanticum Frolov, Grossi and Vaz-de-Mello 2015
Creators: name: Frolov, Andrey V.
name: Akhmetova, Lilia A.
name: Vaz-de-Mello, Fernando Z.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Hybosoridae
Aegidium
Aegidium atlanticum

description: Aegidium atlanticum Frolov, Grossi and Vaz-de-Mello, 2015
(Figure 8 (a–e))
Aegidium atlanticum Frolov, Grossi and Vaz-de-Mello, 2015: 437.
Type locality
Brazil, Rio de Janeiro, Nova Friburgo, Macaé de Cima.
Type material examined
Holotype, male at CEMT labeled ‘ BRAZIL: RJ 1500 m Nova Friburgo Macaé de Cima 13. II.2000 P.Grossi’.
Diagnosis
Aegidium atlanticum is similar to Ae. peruanum sp. nov. in having a complex shape of the parameres with feebly sclerotised processes; this character separates both species from all other Aegidium species. From Ae. peruanum sp. nov., it differs in the shape of the paramere processes and in having a long, curved inner apical spur of mesotibia (Figure 8 (b–d)).
Description
Male (Figure 8 (a–d)). Body length 13.5 mm. Colour uniformly blackish brown.
Anterior margin of frontoclypeus almost straight, broadly rounded at sides, with a narrow, slightly upturned border. Frontoclypeus sparsely punctate with rounded punctures separated by 1–3 puncture diameters.
Eyes relatively large: width about 1/7 distance between eyes in dorsal view.
Pronotum with widely rounded lateral margins, narrower than elytra, 1.25 times wider than length, 0.5 times length of elytra. Posterior angles narrowly rounded. Anterior margin bordered, with a row of large punctures interrupted medially. Base of pronotum without furrow, punctate with a row of irregular, mostly elongate punctures. Pronotal disc slightly excavated. Lateral pronotal processes feebly developed, as low umbones. Pronotum irregularly punctate: with rather sparse, round punctures anterolaterally, somewhat coarser round punctures posterolaterally, irregular coarse punctures on disc.
Scutellum elongate, rounded apically, about 1/12 length of elytra.
Elytra 1.3 times longer than width, with humeral and apical umbones. Elytra widest in basal 1/3, slightly tapering apically in dorsal view. Elytral carinae distinct. Elytra densely punctate with coarse, irregularly shaped punctures arranged in longitudinal rows on disc.
Macropterous.
Mesotibiae without tuft of setae ventroapically. Inner apical spur of mesotibia longer than basal mesotarsomere and curved downwards (Figure 8 (d)).
Aedeagus with relatively large (0.6 times length of phallobase, wider than phallobase in lateral view) parameres of complex shape: apices separated by a constriction and there are long feebly sclerotised processes basad of constriction on each paramere (Figure 8 (b,c)). Ventrobasal transverse plate of parameres indistinct. Ventroapical part of phallobase deeply excavated, with concentric sclerotised carinae. Endophallus without strongly sclerotised sclerites.
Female. In CEMT, there is a female from Bahia State, Brazil, which may belong to this or to another, yet undescribed species. The specimen agrees with the holotype of Ae. atlanticum in its size and general appearance but the sculpture of the elytra is different: elytra are covered with rounded punctures separated by about 0.5 puncture diameters on disc and becoming slightly larger towards apices of the elytra. Additional material is needed to classify this specimen which was collected some 1000 km north of the type locality of Ae. atlanticum.
Distribution
Aegidium atlanticum is known from the Atlantic Forest ecoregion in south-eastern Brazil (Figure 8 (e)).
description: Published as part of Frolov, Andrey V., Akhmetova, Lilia A. & Vaz-de-Mello, Fernando Z., 2017, Revision of the mainland species of the Neotropical genus Aegidium Westwood (Coleoptera: Scarabaeidae: Orphninae), pp. 1035-1090 in Journal of Natural History 51 (19 - 20) on pages 1069-1071, DOI: 10.1080/00222933.2017.1319519, http://zenodo.org/record/4746652