Euryaspis Blanchard, 1850, revalidated

Ctenotis Burmeister 1855: 20, syn. nov. Type species: Ctenotis obesa Burmeister, 1855 (designation: monotypy).

Euryaspis Lacordaire, 1856: 259 (synonymy with Plectris).

Type species

Euryaspis gaudichaudii Blanchard, 1850 (designation: monotypy).

Diagnosis

Clypeus transverse, narrow, posterior angle partially covering the canthus (Fig. 12 A), ventral area deflected vertically; pronotal anterior and posterior margins not beaded, lateral margins crenulate, posterior margin prominent (Fig. 12 A), prosternum anteriorly concave (similar to Fig. 12 K); protibia with three external teeth and with a spur (Fig. 12 A, C); elytral striae indistinct, posterior and posterointernal margins not beaded; abdomen with intersegmental membrane VII–VIII concealed.

Remarks

The present study proposes the synonymy of Ctenotis with Euryaspis and revalidates Euryaspis, formerly a synonym of Plectris, based on the following characters (opposition to Plectris): pronotal lateral margins crenulate (margins straight), posterior margin prominent (not prominent); internal area of metatarsomere V without spine-like setae (with spine-like setae).

Euryaspis is distinguished from other Macrodactylini by having a narrow and transverse clypeus, pronotal lateral margins crenulate and posterior margin strongly prominent.

According to the new synonymy proposed here ( Ctenotis synonym of Euryaspis), the genus now comprises two species: E. gaudichaudii (type species of Euryaspis) and E. obesa (Burmeister, 1855) comb. nov. (type species of Ctenotis). Euryaspis gaudichaudii is distinguished as follows (opposition to E. obesa): antennal clavae of male and females with three antennomeres (Fig. 12 B) (four antennomeres, Fig. 12 A); protarsomere IV about twice as long as wide (Fig. 12 C) (as long as wide, Fig. 12 A); protarsal claws gradually curved (Fig. 12 C) (abruptly curved, Fig. 12 A); male abdominal ventrites with a medial comb of long setae (setae homogeneously distributed).