Aegidinus colbyae Frolov, Akhmetova and Vaz-de-Mello, 2019

Frolov, Andrey V., Akhmetova, Lilia A. & Vaz-de-Mello, Fernando Z., 2019, Contribution to the knowledge of Aegidinus Arrow (Coleoptera: Scarabaeidae: Orphninae): new species and comments on the classification and nomenclature, Journal of Natural History 53 (11), pp. 725-747 : 739-740

Aegidinus colbyae Frolov, Akhmetova and Vaz-de-Mello sp. nov.

( Figure 5 (a – f))

Type locality. Peru, Loreto, Iquitos, Sachamama.

Type material examined

Holotype ( Figure 5 (a,e,d,f)), male at CEMT labelled ‘ PERU: LO: IQUITOS SACHAMAMA 100m 22-III-02 CUROE ROTTEN FISH ’.

Paratype ( Figure 5 (b,c)), female at CEMT labelled ‘ PERU: LO: IQUITOS SACHAMAMA 100m 22-III-02 CUROE ROTTEN FISH ’.

Diagnosis

Aegidinus colbyae sp. nov. is most similar to Ae. brasiliensis Arrow and Ae. howeae Colby but can be distinguished from them by the dorsal processes of the parameres being carina shaped ( Figure 5 (e), arrowed), while this process is tooth or spur shaped in Ae. brasiliensis and Ae. howeae .

Description

Male ( Figure 5 (a)). Body length 10.8 mm. Colour uniformly blackish brown. Anterior margin of frontoclypeus with a long horn rounded apically.

Pronotum with widely rounded lateral margins, almost as wide as elytra, 1.5 times wider than length. Posterior angles widely rounded. Anterior margin bordered, border narrowly interrupted medially, with transversal, bimodal gibbosity. Base of pronotum not bordered, with a row of rounded punctures. Pronotal disc feebly excavated anteromedially, with two gibbosities in centre. Pronotum punctate with a few large rounded punctures laterally and anteromedially and with minute, feebly visible punctures throughout.

Elytra almost as long as wide, widest medially and tapering apically, with humeral and apical humps. First elytral stria as continuous line, connected basally with undulate line from scutellum to humeral hump. Other striae marked with rows of sparse punctures; punctures V-shaped near base, smaller and irregulary elongate on disc.

Protibia without medioapical tooth.

Aedeagus relatively long and slender, ratio of phallobase length/paramere width 2.8 ( Figure 5 (f)). Ventroapical plate of phallobase absent ( Figure 5 (d)). Parameres symmetrical, mediobasal margins of dorsomedial lobes strongly sclerotised (5E), dorsal processes of parameres carina shaped ( Figure 5 (e), arrowed).

Female paratype ( Figure 5 (b)) differs from male in having relatively wider elytra, pronotum and head without excavations and armature, and in having a protibial spur. Body length 8.5 mm. External female genitalia as in Figure 5 (c).

Distribution

The species is known from a single locality in Peru: Loreto, Iquitos, Sachamama ( Figure 7 ).

Etymology

The new species is named after Julia Colby (Peggy Notebaert Nature Museum, Chicago, USA).

Figures

Figure 5. Aegidinus colbyae, holotype male (a, e, d, f), paratype female (b, c). Habitus in dorsal view (a, b); female external genitalia (c); aedeagus in lateral (f) and ventral view (d); parameres in dorsal view (e).

Figure 7. Aegidinus spp. Locality records map.