Ateuchus genieri, Montoya-Molina & Vaz-De-Mello, 2019

Montoya-Molina, Santiago & Vaz-De-Mello, Fernando Z., 2019, Notes on the taxonomy of Deltorhinum Harold 1869 (Coleoptera: Scarabaeidae: Scarabaeinae) with description of a new speciesı updated identi fication key and the transfer of D. robustum to Ateuchus, Journal of Natural History 53 (13), pp. 749-760 : 757

Ateuchus genieri new replacement name

( Figure 4 (a – f))

Deltorhinum robustum Génierı 2010: 44

Diagnosis

Differs from the other species of Deltorhinum by its large size (1.4 cm)ı clypeus widely emarginated and strongly upturned and the two triangular-shaped excavations on the anterior declivity of the pronotum.

Description of the male

Male ( Figure 4 (a – f)) Body length 1.4 cm. Reddish-brown. Head punctuation of medial disc weakly marked. Clypeus elongate and upturnedı presenting a strong medial emargination. Lateral margins of the clypeus distinct and unmodified. Genae clearly angulate laterally. Cephalic carina angulate anteriorlyı medial portion notably lower than the lateral portions. Pronotal medial disc almost imperceptibly punctate. Anterior declivity with two finely punctateı triangular-shaped excavations. Lateral and posterior margins with largerı well-impressed punctation; punctures shallow. Medial sulcus well markedı with some large and shallow punctures. Lateral fossae rounded. Elytra interstriae finely punctateı striae punctation roundedı as wide as the line that connects the punctures. Striae punctures separated by twice the diameter of a puncture on the elytral disc. Striae shallow on the apical edge. Pygidium medial surface finely punctateı shiny. Basal surface displaying transversal microsculptureı margin interrupted apically.

Aedeagus length 3.5 mm. Phallobase approximately twice the length of the parameres. Parameres curved on its inner medial portion from ventral view. External margins straight. Apex rounded and curved medially. Other characters of the aedeagus and the sclerites of the internal sac as represented in ( Figure 4 (d – f)).

Distribution

Brazil

Remarks

Ateuchus genieri is here proposed as a new replacement name for Deltorhinum robustum Génierı 2010 because of junior secondary homonymy (according to ICZN Article 59) with Ateuchus robustus ı previously Choeridium robustum Haroldı 1868 . We name this species in honour of François Génier. We placed D. robustum in the genus Ateuchus due to the following characters not shared with other Deltorhinum but present in several species presently in Ateuchus ı mainly those related to A. procerus : clypeus bidentate and broadly emarginatedı anterior portion of the hipomeron feebly excavated (in Deltorhinum and most other species-groups of Ateuchus deeply excavated)ı meso and meta tarsi not reduced (in Deltorhinum reduced)ı and the presence of a well-defined clypeo-frontal carina found also in A. procerus .

Non type material examined

Brasilien (= BRAZIL): [unspecified locality]ı [no date]ı coll. [anonymous] [♂ CEMT]; Unreadable data [♀ CEMT].

Figures

Figure 4. Deltorhinum robustum male (a) dorsal habitus; (b) anterior view; (c) aedeagus dorsal view of the paramera; (d) aedeagus lateral view; (e) aedeagus ventral view; (f) aedeagus inner sac.