Schizochelus Blanchard, 1850

Fuhrmann, Juares & Vaz-De-Mello, Fernando Z., 2017, Macrodactylini (Coleoptera, Scarabaeidae, Melolonthinae): primary types of type species and taxonomic changes to the generic classification, European Journal of Taxonomy 350, pp. 1-71 : 51-59

Schizochelus Blanchard, 1850

Gastrohoplus Moser, 1921: 165 , syn. nov. Type species: Gastrohoplus mirabilis Moser, 1921 (designation: monotypy).

Type species

Schizochelus flavescens Blanchard, 1850 (designation: Evans 2003: 346).

Diagnosis

Clypeal anteroventral area strongly reduced ( Fig. 15 , similar to Fig. 11 H ); pronotal anterior and posterior margins not beaded; prosternum with an anterior longitudinal carina; protibia with 1–2 external teeth (male with tooth II absent or reduced) and with a spur ( Fig. 16 G–L); male metatibia without spur; male ventrites I–V longitudinally concave ( Fig. 16 A–C); female abdomen sinuous in lateral view ( Fig. 16 D ); tarsal claws with a proximal tooth ( Fig. 16 G–L).

Remarks

The genera Isonychus and Schizochelus are similar to each other. Schizochelus is distinguished as follows (opposition to Isonychus ): male metatibial spur absent (metatibia with 1–2 spurs); male ventrites I–V with medial concavity ( Fig. 16 A–C) (without), male ventrite VI straight and with short and sparse setae (straight or laterally enlarged, and with or without lateral comb of long setae); female abdomen sinuous in lateral view ( Fig. 16 D ) (convex).

The present study proposes the synonymy of Gastrohoplus with Schizochelus , see chapter on “Male morphology and nomenclature” (below) for more information about the new synonymy.

Figures

Fig. 15. Schizochelus Blanchard, 1850, ♂, habitus, lateral (without some appendages). A. Schizochelus flavescens Blanchard, 1850. B. Schizochelus bicoloripes Blanchard, 1850. C. Schizochelus mirabilis (Moser, 1921) comb. nov. Scale bar = 1 mm.

Fig. 11. ♂♂. A−C. Head–prothorax dorsal, tarsus rotated laterally to apex. D−G. Aedeagus (lateral, parameres apex). H. Head−prothorax, ventral. A, D−E. Chariodactylus chacoensis Moser, 1919. B, F−H. Manodactylus gaujoni Moser, 1919. C. Macrodactylus pumilio Burmeister, 1855. Scale bars = 1 mm.

Fig. 16. Schizochelus Blanchard, 1850. A–C. Male abdomen, lateroventral. D. Female abdomen, lateral. E–F. Aedeagus (lateral, parameres apex). G–L. Protibia−tarsus (male, female) (with detail of tarsus: I = dorsal view; K = ventral view). A, E−H. Schizochelus flavescens Blanchard, 1850. B, I–J. Schizochelus bicoloripes Blanchard, 1850. C–D, K–L. Schizochelus mirabilis (Moser, 1921) comb. nov. Scale bars = 1 mm.