Trogidae MacLeay, 1819

Costa-Silva, Vinícius, Strümpher, Werner P. & Vaz-de-Mello, Fernando Z., 2021, Review of the Brazilian species of Omorgus Erichson, 1847 (Coleoptera: Trogidae: Omorginae), Journal of Natural History 54 (31 - 32), pp. 1993-2024 : 1996-1997

Trogidae MacLeay, 1819

Omorginae Nikolajev 2005 ; Smith 2006; Zídek 2013; Strümpher et al. 2014b, Strümpher et al. 2016; Zídek 2017; Hielkema and Hielkema 2019.

Omorgus Erichson, 1847 ; Le Conte 1854; Baker 1968; Scholtz 1986; 1990; Browne et al. 1993; Nikolajev, 2005; Zídek 2013; Strümpher et al. 2014b, Strümpher et al. 2016; Zídek 2017; Hielkema and Hielkema 2019.

Key to the subgenera and species of Brazilian Omorgus :

0 Scape of antennae elongate with pedicel attached subapically; scutellum constricted at base ...................................................................................................................................................... 1 0 ʹ Characteristics not as above ................................................................ Other Trogidae genera

1 Clypeus with apex reflexed. Scutellum oval. Body surface glabrous, without sculpture ......................................................................... Omorgus (Haroldomorgus) batesi ( Harold, 1872)

1 ʹ Clypeus straight. Scutellum hastate. Body surface sculptured .... .... Omorgus (Omorgus) 2

2 Pronotum with lateral margin smooth and continuous ...................................................... 3

2 ʹ Pronotum with lateral margins notched posteriorly.............................................................. 5

3 Mesotibiae with outer margin smooth. Odd-numbered elytral costae with raised pilose tubercles............................................. ............................................. O. loxus ( Vaurie, 1955)

3 ʹ Mesotibiae with outer margin serrate. Odd-numbered elytral costae with distinct flat lustrous areas or round shiny black tubercles.......................................................................... 4

4 Odd-numbered elytral costae with distinct flat lustrous areas.......................................... ................................................................................................................. O. badeni ( Harold, 1872)

4 ʹ Odd-numbered elytral costae with round shiny and raised black tubercles................... ........................................................................................................................ O. borrei ( Harold, 1872)

5 Mesotibiae with inner ventral surface glabrous at basal half ( Figure 5d , black arrow) ...................................................................................................... O. persuberosus ( Vaurie, 1962)

5 ʹ Mesotibiae with inner ventral surface glabrous only at basal one-fifth or less ( Figure 6d , black arrow).................................................................................................................................... 6

6 Pronotum with lateral margin serrate; median- and latero-basal tubercles weakly developed. Odd-numbered elytral costae not prominent or even absent....................... ............................................................................................................ O. suberosus ( Fabricius, 1775)

6 ʹ Pronotum with lateral margin sinuate; median basal and latero-basal tubercles prominent. Odd-numbered elytral costae prominent, distinctive....................................... .................................................................................................................... O. triestinae Pittino, 1987

Figures

Figure 5. Holotype of Trox persuberosus Vaurie, 1962 (now Omorgus persuberosus). A, dorsal view; B, tarsus and aedeagus in dorsal view; C, holotype type labels and D, mesotibia of O. persuberosus, showing inner ventral surface. (Photos A-C by Sônia Casari, copyright MZSP).

Figure 6. Omorgus (Omorgus) suberosus (Fabricius, 1775). A, dorsal view; B-C, aedeagus, dorsal and lateral views; D, mesotibia of O. suberosus, showing inner ventral surface.