Aegidium sinuatum Frolov, Akhmetova

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 : 1074-1075

Aegidium sinuatum Frolov, Akhmetova and Vaz-de-Mello, sp. nov.

( Figure 11 (a–g))

Type locality

Panama, Chiriquí, Cerro Pelota, 4 km N Santa Clara.

Type material examined

Holotype, male at CMN labeled ‘ Panama: Chiriqui Cerro Pelota 4 km N Sta.Clara 15–30 VII 1982 B.Gill 1500 m’ ( Figure 11 (b)) . Paratypes: PANAMA. Chiriquí: one male and one female at BGCO labeled ‘ Panama: Chiriqui Cerro Pelota 4 km N Sta. Clara VIII 1982 B. Gill 1500 m’; one female at BGCO labeled ‘ Panama: Chiriqui Cerro Pelota 4 km N Sta. Clara 5–15 VII 1982 B.Gill 1500 m’.

Diagnosis

Aegidium sinuatum sp. nov. is most similar to Ae. howdeni sp. nov. but can be separated from it by the mesotibiae without a tuft of setae on the inner side apically, relatively wider parameres (in lateral view) and deeply sinuate posterior angles of the pronotum.

Description

Holotype, male ( Figure 11 (a,d–f)). Body length 12.0 mm. Colour uniformly blackish brown.

Anterior margin of frontoclypeus slightly convex in middle, slightly sinuate each side of medial convexity, rounded laterally, with a narrow border. Frontoclypeus coarsely punctate with rounded punctures separated by about 1–2 puncture diameters; punctures on basal part of frontoclypeus 1.5–2.0 times larger than in apical part.

Eyes relatively large: width about 1/7 distance between eyes in dorsal view.

Pronotum with widely rounded lateral margins, as wide as elytra, 1.5 times wider than length, 0.5 times length of elytra. Posterior angles deeply sinuate in dorsal view ( Figure 11 (a)). Anterior margin bordered, with a row of large punctures interrupted medially. Base of pronotum without furrow, punctate with irregular row of large, rounded punctures. Pronotal disc excavated, with slightly convex area medially. Lateral pronotal processes acute in lateral view, their apices not protruding past lateral margins of pronotum in dorsal view. Pronotum punctate with large rounded punctures separated by 2–3 puncture diameters on disc and with smaller but denser rounded punctures on sides.

Scutellum narrow, rounded apically, about 1/11 length of elytra.

Elytra 1.25 times longer than wide, with humeral and apical umbones. Elytra widest in basal 1/3, slightly tapering apically in dorsal view. First elytral carina feebly distinct basally, second indistinct. Elytra covered with relatively dense rounded to elongate punctures separated by 1–2 puncture diameter.

Macropterous.

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

Aedeagus with relatively short (0.55 times length of phallobase), tapering parameres ( Figure 11 (d)). Apices of parameres rounded in dorsal view. Parameres wider than apical part of phallobase in dorsal view ( Figure 11 (e)). Ventrobasal transverse plate of parameres distinct. Endophallus without strongly sclerotised sclerites. Cranial part of spiculum gastrale relatively narrow, almost parallel-sided, rounded apically ( Figure 11 (f)).

Female ( Figure 11 (c)) differs from male in having protibial spur and relatively smaller pronotum without armature but with shallow longitudinal impression, and in the absence of the inner protibial tooth.

Variation

Body length of the paratypes varies from 9.0 mm (male) to 11.0 mm (females). Pronotum in male paratype with indistinct lateral processes, shallow concavity anteromedially, and tubercle-shaped anteroapical pronotal process.

Distribution

Aegidium sinuatum sp. nov. is known from one locality in southern Central America (Cordillera de Talamanca) ( Figure 11 (g)).

Etymology

The name of the new species is from the Latin adjective sinuatum for ‘sinuate’, referring to the deeply sinuate posterior angles of the pronotum.

Figures

Figure 11. Aegidium sinuatum, holotype male (a, b, d–f), paratype female (c). Habitus in dorsal view (a, c), labels (b), aedeagus in lateral view (d), parameres in dorsal view (e), spiculum gastrale (f), locality map (g).