Omophron (Omophron) riedeli Emden, 1932: 5

Anichtchenko, Alexander & Valainis, Uldis, 2023, Revision of the subgenus Omophron (s. str.) Latreille, 1802 (Coleoptera: Carabidae Omophron) of the Afrotropical region, Zootaxa 5284 (2), pp. 201-246 : 209-211

Omophron (Omophron) riedeli Emden, 1932: 5

Loc. Typ.: Ost-Africa, Kwa Mtoro bei Kondoa Irangi [ Tanzania].

Material examined. ETHIOPIA: Sidamo Prov. 1 km S of Sidambale Bridge, 1130 m, 18– 21.05.1975, Clarke leg. [5.707720, 39.538622] (1 ♀, MRAC) . KENYA: Eastern Province, Makueni District, Mukaa , 01.1924 [-1.846862, 37.302846] (1 ♀, BMNH) ; Kiu , Someren leg. (6 ♁, 4 ♀, BMNH) . TANZANIA: Kondoa Irangi , 07.1929, J. Riedel Geschenk leg. [-4.896620, 35.795991] (Holotype ♁, SMTD) ; Longido Masai Distr. , 1500 m, 19.04.1957, Basilewsky & Leleup leg. [-2.727270, 36.698107] (1 ♀, MRAC) . ZIMBABWE: Shangani near Gweru , 3.12.1998, A. Kudrna Jr. leg. [-19.743178, 29.413479] (2 ♀, DUBC, PSC) ; Rhodesia, Sebakwe , SAM-COL-A018083, [-18.862753, 29.836817] (1 ♀, SAMC) ; Plumtree, Rhodesia 18.5.06 [-20.503250, 27.825116] (1 ♁, 1 ♀, SAM-COL-A006514) . REPUBLIC OF SOUTH AFRICA: 35 km W Hoedspruit , 450m, 16– 21.12.2009, A. Kudrna Jr. leg. [-24.444283, 30.597157] (1 ♀, PSC) ; 70 km NE Polokwane, cca 10 km SW Morebeng , 1100 m, 09– 10.12.2009, A. Kudrna Jr. leg. [-23.589578, 29.888979] (1 ♀, DUBC) .

Differential diagnosis. Similar to O. minutum but differ by their larger size, coarsely punctured pronotum, and metallic green or blue pattern on the head and pronotum.

Redescription. Body length 4.98–5.23 mm; width 3.51–3.62 mm. Habitus ( Fig. 8 ).

Color: head, pronotum, elytra, and mandibles dark reddish brown, labrum, edge of pronotum and elytra yellow, legs and antennae brownish yellow. Pattern on head and pronotum dark green or blue. Pattern on elytra dark brown. Venter dark brown.

Head relatively flat, coarsely punctate laterally and posteriorly, with one supraorbital setiferous puncture on each side. Subocular ridge well developed, curved upwards and slightly rounded. Pattern on head V-shaped, with indistinct boundaries. Front margin of clypeus formed by two straight lines meeting at an obtuse angle, clypeus bisetose, coarsely but sparsely and unevenly punctate. Labrum with slightly jagged anterior margin, with moderately rounded sides and six setae. Antennal scape unisetose at apex, antennomeres 3 and 4 smooth, with some longer setae at the apex, 5–11 pubescent. Gula smooth, gena moderately wrinkled, coarsely but sparsely punctate. HW: 1.62–1.67 mm.

Pronotum (PL: 1.23–1.29 mm, PW: 2.97–3.09 mm.) clearly convex, base bisinuate on each side, with moderately wide border, sides slightly rounded near the base and straight near the anterior angles. Pronotum with dark green or blue longitudinal arranged pattern. Anterior angles almost acute and strongly raised anteriorly. Pronotum coarsely and densely, sometimes confluente punctate on the disc. Median impression reduced or barely visible. Prosternum coarsely and densely punctate, episternum coarsely but sparsely punctate, proepipleura with few punctures in anterior half.

Elytra (EL: 3.27–3.38 mm, EW: 3.51–3.62 mm.) clearly convex, sides strongly rounded, with narrow edge. Elytral pattern dark brown, consisting of three bands. Elytra with 15 striae extended from the base to the apex. Striae well developed, coarsely and densely punctate, punctures broad and deep. Intervals moderately convex on the disc, clearly convex laterally.

Venter ( Fig. 10 ). Metasternum coarsely and densely punctate, metepisternum and metepimeron, and elytral epipleura coarsely but sparsely punctate. Ventrites IV and V with a transverse row of large punctures. Metacoxa with 8–11 punctures.

Aedeagus ( Fig. 12 ). Median lobe relatively short and robust, ventral side slightly and evenly arcuate from base to apex. Apical lamella in dorsal view triangular, short, sides straightly convergent to rounded tip. Apex straight in lateral view. Endophallus structure ( Fig. 16 ) is similar to O. minutum . See comments.

Comments. Additional material of O. riedeli and O. minutum needs to be studied. It may turn out that these are two extreme forms of the same species.

Distribution. Ethiopia, Kenya, Tanzania, Zimbabwe, Republic of South Africa (Map. 2).

References. Emden 1932.

Figures

FIGURES 7–8. Habitus of Omophron “minutum”—species group, dorsal view: 7—O. (O.) minutum (Senegal, Khayes); 8—O. (O.) riedeli (Zimbabwe, Sebakwe). Scale bar 5 mm.

FIGURES 9–10. Habitus of Omophron “minutum”—species group, ventral view: 9—O. (O.) minutum (Senegal, Khayes); 10—O. (O.) riedeli (Zimbabwe, Sebakwe). Scale bar 5 mm.

FIGURES 11–14. Aedeagus structure. a—apex in dorsal view, b—right lateral view: 11—O. (O.) minutum (Senegal, Khayes); 12—O. (O.) riedeli (Zimbabwe, Sebakwe); 13—O. (O.) clavareaui; 14—O. (O.) muellerae sp. n. Scale bar 1 mm.

FIGURES 15–16. Endophallus structure, dorsal view: 15—O. (O.) minutum (Senegal, Khayes); 16—O. (O.) riedeli (Zimbabwe, Sebakwe). Scale bar 1 mm.