Lethrus inermis, Reitter, 1897

Shapovalov, Andrey M. & Bagaturov, Mikhail F., 2023, A review of the subgenus Mesolethrus Nikolajev, 2003 of the genus Lethrus Scopoli, 1777 (Coleoptera: Geotrupidae: Lethrinae) with description of a new species, Zootaxa 5351 (4), pp. 435-452 : 436

Lethrus inermis -species group

Diagnosis. Dorsal surface of mandibles in both sexes with sharp, elevated keels ( Figs. 1–2 ). Elytral striae definitely impressed ( Figs. 1–2 ). Ventrites 1–5 with prominent central denticle posteriorly (rarely denticles indistinct), denticles apically with erect setae ( Fig. 39 ). Subapical ventrite with sparse semierect setae, density of setae not clearly differing between sexes. Parameres straight, narrowly rounded apically ( Figs. 9–10 ); sclerotized apex of endophallus elongate, subclavate, noticeably curved in lateral view, in dorsal view appearing trilobed anteriorly, surface sharply spiny-granular ( Figs. 22–23 ). Dorsal surface of the body shiny ( Figs. 1–2 ), but in older and abraded specimens surface nearly black or black.

Notes. The species group includes the only species L. inermis .

Figures

FIGURES 1–4. Lethrus (Mesolethrus) species, male, habitus. 1–2, L. inermis Reitter, 1897 (1—Dahanakiik; 2—20 km W Oqmachit); 3, L. shakhristanicus Nikolajev, 2003 (9 km S Ai-Kol); 4, L. nuratavicus Nikolajev, 1987 (28 km SW Zaamin).

FIGURES 32–43. Lethrus (Mesolethrus) species. 32, 39, L. inermis Reitter, 1897 (Dahanakiik); 33, L. shakhristanicus Nikolajev, 2003 (9 km S Ai-Kol); 34, L. nuratavicus Nikolajev, 1987 (28 km SW Zaamin); 35, 40–42, L. microbuccis Ballion, 1871 (35, 41—Golbo env., 39—Mullabulak, 40—20 km S Guldara); 36, L. elisae Nikolajev, 2001 (Shurob); 37–38, 40–41, L. dyonini A. Shapovalov & Bagaturov, new species, paratypes (environs of Tashsay). 32–37 gena, 38 left mandible, 39 abdomen (lateral view), 40–41 abdomen and apices of elytra (antero-ventral view; 40—male, 41—female), 42–43 tuft of long erect setae on subapical ventrite (lateral view; 42—male, 43—female).

FIGURES 9–31. Lethrus (Mesolethrus) species, males genitalia. 9–10, 22–23, L. inermis Reitter, 1897 (9–10—20 km W Oqmachit, 22–23—Pashtamazar); 11–12, 24, L. shakhristanicus Nikolajev, 2003 (9 km S Ai-Kol); 13–14, 25–27, L. nuratavicus Nikolajev, 1987 (28 km SW Zaamin); 15–16, 28, L. microbuccis Ballion, 1871 (Golbo env.); 15–16, 28, L. microbuccis Ballion, 1871 (Golbo env.); 17–18, 29, L. elisae Nikolajev, 2001 (Shurob); 19–21, 30–31, L. dyonini A. Shapovalov & Bagaturov, new species, paratypes (environs of Tashsay). 9–21 aedeagus (9, 11, 13, 15, 17, 19–20—ventral view; 10, 12, 14, 16, 18, 21—lateral view), 22–31 sclerotized apex of endophallus (22, 24, 25, 28–30 dorsal view, 23, 26, 31—lateral view, 27—ventral view).