Pectinosoma Arrow, 1913 Type species Pectinosoma elongata Arrow, 1913 (designation: monotypy). Diagnosis Pronotum−scutellum contact slightly sinuous (similar to Fig. 8 E); male mesotarsomeres I−IV wider than long and with external projection; internal area of metatarsomere V with spine-like setae; male ventrite V with medial lobe bearing truncate setae in transverse palisade (Fig. 14 D–E); female pygidium with sinuous apex (Fig. 14 F–G). Remarks The genera Ancistrosoma, Chariodema, Faula, Manopus, Pectinosoma and Pseudopectinosoma are similar to each other. They have a sinuous pronotum−scutellum contact and separate meso- and metacoxae. In Ancistrosoma and Pectinosoma the prosternum has a prominent posterior process (simple in Ancistrosoma (Fig. 14 A); bifid in Pectinosoma). Other distinctive characters of Pectinosoma are (opposition to 1, Ancistrosoma; 2, Pseudopectinosoma): pronotum−scutellum contact slightly sinuous (similar to Fig. 8 E) (1, 2, strongly sinuous, Fig. 8 A); male ventrite V with medial lobe bearing truncate setae in transverse palisade (Fig. 14 D–E) (1, ventrite I with an acute process (Fig. 14 A); 2, ventrite VI with a raised area); female pygidial anterior margin straight and posterior margin deeply sinuous (Fig. 14 F–G) (1, anterior margin sinuous and posterior margin slightly sinuous (Fig. 14 B–C); 2, anterior margin straight and posterior margin slightly sinuous). The notes about Pseudopectinosoma are based on its original description (Katovich 2011).

Published as part of Fuhrmann, Juares & Vaz-De-Mello, Fernando Z., 2017, Macrodactylini (Coleoptera, Scarabaeidae, Melolonthinae): primary types of type species and taxonomic changes to the generic classification, pp. 1-71 in European Journal of Taxonomy 350 on page 42, DOI: 10.5852/ejt.2017.350, http://zenodo.org/record/3832682