Geotrupes

Arriaga-Jiménez, Alfonsina, Kohlmann, Bert & Cruz-García, Brenda J., 2020, A predicted new Geotrupes from the mountains of Oaxaca, Mexico, and a description of the male of Geotrupes lobatus (Coleoptera: Geotrupidae), Acta Entomologica Musei Nationalis Pragae 60 (2), pp. 493-508 : 505

Key to the Geotrupes of Oaxaca

1 Antennal club grayish-black ( Fig. 2b ); each mandible with a considerably pronounced rounded lobe; legs metallic blue; male protibiae long and rounded with apical teeth spiniform; male profemora with a strong transverse tooth at its base ( Fig. 3b ); aedeagus as in Figs 2 c–f; Sierra Sur (Sierra de Miahuatlán). ................. ............................................. G. lobatus Howden, 1974

– Antennal club yellowish ( Figs 1 a–b) or reddish-brown ( Fig. 6a ) to brown; mandibles lacking a pronounced rounded lobe ( Fig. 1a ); legs black; male protibiae short and straight with apical teeth flattened; male profemora without a transverse ridge at its base. ...................... 2

2 Dorsally shining; pronotum, scutellum and elytral intervals shining, offen green, golden or blue with coppery reflections ( Figs 1 , 7a , 8 , 9 ); elytral intervals convex ( Figs 1 , 7 , 8 ); smaller species (13–22 mm); males not having profemora ventrally excavated near procoxae. ........................................................................................ 3

– Dorsally opaque; pronotum, scutellum, and frequently elytral intervals finely shagreened; elytral intervals flattened centrally ( Fig. 6a ); large species (22–26 mm); males having profemora ventrally excavated near procoxae; aedeagus as in Figs 6 c–f; mountains in central Mexico (Guerrero, Guanajuato, Jalisco) and mountains of Oaxaca (Mixteca Shield, Sierra Norte, Sierra Sur). ........................................................ G. sallei Jekel, 1866

3 Posterior pronotal margin fine but distinct, except in front of scutellum ( Fig. 7a ); male mesoventrite with a distinct carina in front of mesocoxae; male procoxa forming a broad saddle-like structure at the point of junction with trochanter; aedeagus as in Figs 7 c–f; Sierra Madre Oriental (Hidalgo, Puebla, Veracruz) and Sierra Norte. .................. G. nebularum Howden, 1964

– Posterior pronotal margin distinct in front of scutellum ( Figs 1 , 8 , 9 ); male mesoventrite with a distinct, projected keel in front of mesocoxae; male procoxa forming a slender saddle-like structure at the point of junction with trochanter. ............................................... 4

4 Elytral striae finely punctate or crenulate except near suture ( Figs 1 , 8b ); elytra bluish-black, greenish-black, or golden-black sometimes with reddish-coppery tint ( Figs 1 , 8b ); pronotum punctate laterally ( Figs 1 , 8b ); Sierra Norte or Mixteca. ............................................... 5

– Elytral striae virtually impunctate, at most vaguely crenulate ( Fig. 8a ); elytra black with faint tinge of green or blue on elytron; pronotum generally heavily and grossly punctate ( Fig. 8a ); aedeagus like Figs 8 c–f; Sierra Sur (Sierra de Miahuatlán). ..................... ................................................. G. pecki Howden, 1974

5 Elytra dull bluish-black ( Fig. 9b ); aedeagus as in Figs 9 c–f; Sierra Norte (Sierra de Ixtlán, Sierra de Juárez, Sierra Mazateca, and Nudo del Zempoaltépetl). ........... ........................................ G. viridiobscurus Jekel, 1866

– Elytra bright green, blue, or golden-black with reddish-coppery tint ( Fig. 1a ); aedeagus as in Figs 1 c–f; Mixteca (Sierra de Tlaxiaco). .......................................... ..................................................... G. nuntiatus sp. nov.

Figures

Fig. 2. Geotrupes lobatus Howden, 1974: a – male dorsal view (16.16096°N, -96.24452°W); b – female dorsal view (16.16096°N, -96.24452°W); c–f – male genitalia: c – in dorsal view, d – in ventral view; e–f – lateral views. Scale bars = 5 mm (a–b), 2 mm (c–f).

Fig. 3. Morphological detail of male protibiae: a – Geotrupes nuntiatus Kohlmann & Arriaga-Jiménez, sp. nov.; b – G. lobatus Howden, 1974; arrow pointing at the apical tooth on the profemur. Scale bar = 2 mm.

Fig. 1. Geotrupes nuntiatus Kohlmann & Arriaga-Jiménez, sp. nov.: a – male dorsal view (17.13087°N, -97.66402°W); b – female dorsal view (17.129932°N, -97.663673°W); c–f – male genitalia: c – in dorsal view, d – in ventral view; e–f – lateral views. Scale bars = 5 mm (a–b), 2 mm (c–f).

Fig. 6. Geotrupes sallei Jekel, 1866: a – male dorsal view (16.19231°N, -96.45711°W); b – female dorsal view (holotype Howden CMN); c–f – male genitalia: c – in dorsal view, d – in ventral view; e–f – lateral views. Scale bars = 5 mm (a–b), 2 mm (c–f).

Fig. 7. Geotrupes nebularum Howden, 1974: a – male dorsal view (19.03638°N, -97.17138°W); b – female dorsal view (19.2533°N, -97.98433°W); c–f – male genitalia: c – in dorsal view, d – in ventral view; e–f – lateral views. Scale bars = 5 mm (a–b), 2 mm (c–f).

Fig. 8. Geotrupes pecki Howden, 1974: a – male dorsal view (16.17325°N, -96.24708°W); b – female dorsal view (16.12138°N, -96.45222°W); c–f – male genitalia: c – in dorsal view, d – in ventral view; e–f – lateral views. Scale bars = 5 mm (a–b), 2 mm (c–f).

Fig. 9. Geotrupes viridiobscurus Jekel, 1866: a – male dorsal view (17.44361°N, -96.50361°W); b – female dorsal view (16.160961°N, -96.244523°W); c–f – male genitalia: c – in dorsal view, d – in ventral view; e–f – lateral views. Scale bars = 5 mm (a–b), 2 mm (c–f).