Aegidiellus dentipenis Frolov, Akhmetova

Frolov, Andrey V., Akhmetova, Lilia A. & Vaz-de-Mello, Fernando Z., 2017, Revision of the Neotropical scarab beetle genus Aegidiellus Paulian (Coleoptera: Scarabaeidae: Orphninae) with description of two new species, Journal of Natural History (J. Nat. Hist.) 51 (29 - 30), pp. 1767-1779 : 1771-1774

Aegidiellus dentipenis Frolov, Akhmetova & Vaz-de-Mello, sp. nov.

( Figure 1 (a–f))

Type locality

Brazil, Rio de Janeiro, near Juturnaiba Lake.

Type material examined

Holotype. male at CEMT labelled ‘L. Juturnaiba. Araruama, RJ BRASIL, XI.1981 M. Alvarenga //coleçao M. Alvarenga’.

Diagnosis

Aegidiellus dentipenis sp. nov. can be easily separated from the other species of the genus by the shape of the aedeagus: phallobase wider, its anterodorsal margin not protruding; parameres wider, their lateral margin with deep sinuation basally forming a tooth ( Figure 1 (d–f)). It also differs in having a spiculum gastrale of intermediate form between T-shaped (similar to that in most Aegidium and in Paraegidium ) and triangular (as in other Aegidiellus species ).

Description

Holotype, male ( Figure 1 (a–f)). Body length 8.5 mm. Colour uniformly dark brown.

Anterior margin of frontoclypeus slightly convex in middle, slightly sinuate each side of medial convexity, rounded laterally, with a narrow border. Frontoclypeus relatively sparsely punctate with punctures having indistinct margins anteriorly, slightly rugose between eyes.

Pronotum with widely rounded lateral margins, as wide as elytra, 1.5 times wider than length, 0.6 times length of elytra. Posterior angles sinuate in dorsal view. Anterior margin bordered laterally, with a conical tubercle-like anterior pronotal process. Base of pronotum without furrow, punctate with irregular row of large, elongated punctures. Pronotum deeply excavated in middle, almost flat on disc. Disc punctate with coarse, rounded punctures separated by one to two puncture diameters except for sparsely punctate area in near base.

Elytra 1.08 times longer than wide, with feebly distinct humeral and apical humps. Elytra widest in basal one-third, rounded apically in dorsal view. Elytral carinae marked with rows of round to elongated punctures separated by one ot three diameters. Elytral intervals smooth.

Aedeagus with robust phallobase, separated into smaller basal and larger apical parts by constriction ( Figure 1 (d)). Apical part of phallobase without protruding anterodorsal margin and with convexity anteroventrally. Lateral margin of parameres with deep sinuation forming a tooth basally ( Figure 1 (e,f)). Spiculum gastrale with wide cranial part ( Figure 1 (c)).

Female. Unknown.

Distribution

The species is known from one locality near Juturnaiba Lake, Rio de Janeiro State, Araruama Municipality, Brazil ( Figure 1 (b)).

Etymology

From the Latin dentis for ‘tooth’ and penis.

Figures

Figure 1. Aegidiellus dentipenis¸ holotype male (a, c–f). Habitus in dorsal view (a), locality map (b; triangle – A. dentipenis; circle – Aegidiellus zezaoi), spiculum gastrale (c); aedeagus in lateral view (d), parameres in dorsal (e) and apical (f) view.