Ateuchus (Lobidion), 2018

Montoya-Molina, Santiago, González-Alvarado, Arturo, Giraldo-Echeverri, Carolina & Vaz-de-Mello, Fernando Z., 2021, Ateuchus fedescobari - a new dung beetle (Coleoptera: Scarabaeinae) species from Colombia, and redescription of the rare A. punctatissimus (Génier, 2010) from Brazil, Journal of Natural History 55 (1 - 2), pp. 115-124 : 116-117

Key to the species of Ateuchus (Lobidion)

1. Sixth ventrite lacking posterior process ............................................................... Ateuchus s. str.

- Sixth ventrite bearing one or two posterior processes..................... 2 Ateuchus (Lobidion)

2. Body black. Head and pronotum with deep punctures separated by once the diameter of a puncture. Pronotal posterior edge not marginated. Posterior area of pronotum displaying rounded punctures ( Figure 1 (a,c)). Sixth ventrite with a single acute dentiform process directed posteriorly ( Figure 1 (a)). Anterior margin of metafemora unmodified in males. Amazon, Brazil....................... ....................... Ateuchus (Lobidion) punctatissimus ( Génier, 2010) .

- Body copper. Head and pronotum microsculptured, not heavily punctate. Pronotal posterior edge marginated. Posterior surface displaying scattered ocellate and ‘U’- shaped punctuation separated by once the diameter of a puncture ( Figure 3 (d)). Sixth ventrite with two acute process directed posteriorly ( Figure 2 (d)). Male anterior margin of metafemora with dentiform process resembling a ‘hook’ ( Figure 2 (b,d)) in males. Caribbean coast of Colombia................................ Ateuchus (Lobidion) fedescobari sp. nov.

Figures

Figure 1. Ateuchus (Lobidion) punctatissimus male. (a) habitus; (b) ventral view; (c) head frontal view; (d) elytra and pseudoepipleura lateral view; (e) aedeagus lateral view; (f) aedeagus dorsal view; (g) internal sac of the aedeagus; (h) endophallus.

Figure 2. Ateuchus (Lobidion) fedescobari sp. nov. male holotype. (a) habitus; (b) ventral view; (c) head frontal view; (d) ventrites and metafemora, arrow pointing the metafemora dentiform process; (e) aedeagus lateral view; (f) aedeagus dorsal view; (g) internal sac of the aedeagus; (h) endophallus.

Figure 3. Ateuchus (Lobidion) fedescobari sp. nov. female paratype. (a) habitus; (b) ventral view; (c) head frontal view; (d) pronotal microsculpturation and posterior ‘U’-shaped punctuation.