Aegidium geayi Paulian, 1984

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), Journal of Natural History 51 (19 - 20), pp. 1035-1090 : 1076-1078

Aegidium geayi Paulian, 1984

( Figure 13 (a–f))

Aegidium geayi Paulian, 1984: 81

Type locality

French Guiana, La Chaumière.

Type material examined

Holotype, male ( Figure 13 (a)) at MNHN labeled ‘ GUYANE Fse CAYENNE La Chaumière Leg: P.ARNAUD III.76 / Aegidium geayi n.sp. R. Paulian det./MUSEUM PARIS/HOLOTYPE’ . Paratype, female at MNHN labeled ‘MUSEUM PARIS GUYANE FRANC. CAMOPI F. GEAY 1900/682/ Aegidium geayi n. sp. R. Paulian det./ALLOTYPE’.

Additional material examined

BRAZIL. Amapá: one female at MNHN, Lunier River , 1899, F. Geay leg. Amazonas: one female at CEMT, Amazonas , road AM 010 km 133, 15 March 1979, Youne and Arias leg .; one female at CEMT, Coari, Orucu River, Angelim , 23 November–2 December 1992, P.F. Bührnheim and N.O. Aguiar leg .; one female at MNHN, Ega; one male at CEMT, Manaus, Esteio Ranch , pitfall with human excrements, 21–24 July 2000, I. Quintero leg .; two females at CEMT, Manaus. Res . Adolpho Ducke , 28 April-3 May 2013, F. Vaz-de-Mello leg .; one male at CEMT, Monilla-Amena , 70 m, BTF pitfall, October 2000, L. Corrales leg .; one male at MNHN, SÃo Paulo de OlivenÇa, M. de Mathan leg . FRENCH GUIANA. One female at CMN, 8.4 km SSE Roura, 200 m, FIT, 29 May– 10 June 1997, J. Ashe and R. Brooks leg .; one male and two females at EPGC, three females at ZIN, one male and 13 females at CEMT, Bélizon, May 2016; one male at MNHN, Cayenne; one female at ZIN, Mont Grand Matoury , 24 January 2013, SEAG leg .; one male and one female at CEMT, Nouragues , primary forest, FIT, April 2003, F. Feer leg .

Diagnosis

Aegidium geayi is most similar to Ae. rafaeli sp. nov. and Ae. peres fi lhoi sp. nov. but differs from them in having denser punctation of elytra. From the former species it also differs in having mesotibiae without a tuft of setae on inner side apically, and from the later in longer parameres which are about as wide as the phallobase in dorsal view.

Description

Male ( Figure 13 (a)). Body length 9.0– 13.5 mm. Colour uniformly dark brown to black.

Anterior margin of frontoclypeus slightly convex in middle, slightly sinuate each side of medial convexity, rounded laterally, slightly uplifted. Frontoclypeus coarsely punctate with rounded punctures separated by about 1 puncture diameter; punctures becoming smaller towards anterior margin.

Eye width about 1/6 distance between eyes in dorsal view.

Pronotum with widely rounded lateral margins, as wide as elytra, 1.4 times wider than length, 0.6 times length of elytra. Posterior angles narrowly rounded. Anterior margin bordered, with a row of large punctures interrupted medially. Base of pronotum with furrow punctate with a row of large, rounded punctures. Pronotal disc feebly excavated. Lateral pronotal processes obtuse in lateral view, their apices not protruding past lateral margins of pronotum in dorsal view. Pronotum punctate with large dense rounded punctures separated by 0.5–1 puncture diameters; punctures along midline of pronotum somewhat elongate oval.

Scutellum narrow subtriangular, about 1/12 length of elytra.

Elytra 1.15 times longer than wide, with humeral and apical umbones. Elytra widest in basal 1/3, slightly tapering apically in dorsal view. First elytral carina distinct, second feebly distinct. Elytra covered with dense, almost adjoining at sides, rounded to irregularly shaped punctures.

Macropterous.

Mesotibiae without tuft of setae ventroapically. Inner apical spur of mesotibia shorter than basal mesotarsomere and not curved downwards.

Aedeagus with relatively long (0.55 times length of phallobase), tapering parameres ( Figure 13 (c)). Apices of parameres narrowly rounded in dorsal view. Parameres slightly wider than apical part of phallobase in dorsal view ( Figure 13 (d)). Ventrobasal transverse plate of parameres distinct. Endophallus without strongly sclerotised sclerites. Cranial part of spiculum gastrale tapering, widened and rounded at very apex ( Figure 13 (e)).

Female ( Figure 13 (b)) differs from male in having protibial spur and relatively smaller pronotum without armature. Body length of examined females varied from 9.5 to 11.5 mm.

Variation

Some of the examined males are much smaller than others, and have poorly developed pronotal excavation (only longitudinal groove), ill-defied lateral pronotal processes but relatively long, acute anterior pronotal process.

Distribution

Aegidium geayi is widely distributed in Amazonia ( Figure 13 (f)).

Figures

Figure 13. Aegidium geayi, holotype male (a), male (c–d), female (b). Habitus in dorsal view (a, b), aedeagus in lateral view (c), parameres in dorsal view (d), spiculum gastrale (e), locality map (f).