Rhytidognathus ovalis (Dejean, 1831)

Roig-Junent, Sergio & Rouaux, Julia, 2012, A new species of Rhytidognathus (Carabidae, Migadopini) from Argentina, ZooKeys 247, pp. 45-60 : 48-49

Rhytidognathus ovalis (Dejean, 1831)

Nebria ovalis Dejean, 1831: 581.

Rhytidognathus ovalis : Chaudoir 1861.

Material.

Male and female,Cerro Colorado Uruguay, Florida(MLP); male Banda Oriental (IADIZA).

Diagnosis.

Head with deep punctures in front, as well as at the base and apex of pronotum; elytra black, concolor; labrum concolor; legs black or dark red, tarsi reddish; apex of median lobe rounded.

Description.

Body shape oval. Length: 12-13 mm; coloration: black; with antennae light colored, reddish, and legs testaceous or dark reddish. Elytra black, concolor.

Head.Head with deep punctures in front, eyes slightly protruding, sub-quadrangular. Maxillary palpi black or dark red.

Prothorax. Wider than long, maximum width at middle (Fig. 2); dorsal surface with deep punctures at base and apex (Fig. 2); lateral margins narrow, curved; central longitudinal sulcus slightly developed; posterior transverse foveae impressed, with deep punctures (Fig. 2); prosternum with punctures; prosternal apophysis prolonged into a carina, which extends straight toward the dorsal region (Fig. 3).

Pterothorax:Elytra. Humeral angles rounded (Fig. 4); striae well impressed, and deeply foveate on basal third (Fig. 4), being less marked toward the apex; six to seven setae only in the ninth interval.

Male genitalia(Figs 10-12). Median lobe wide, with apex rounded (Figs 10-12), apical orifice small, opening laterally to the right with a sclerified plate. Basal orifice wide, closed dorsally (Fig. 10), without basal keel. Left paramere wide with apex round ed (Fig. 11), with setae on apical third (Fig. 11). Right paramere straight and thin, the same width all along its length, with several setae from middle to apex (Fig. 11).

Female genital track(Fig. 13). With gonopod VIII small. Gonopod IX dimerous, the base with two sclerified plates, the apex small and without setae, with subapical setose organ (Fig. 13). Bursa copulatrix big, without accessory glands. Spermatheca on the base of oviduct, digitiform. Bursa copulatrix with a well developed sclerite.

Intraspecific variation. Jeannel (1938) found some intraspecific variation in the intensity of basal punctures of the pronotum and also in the coloration of the legs.

Distribution.

Uruguay: Montevideo: Montevideo ( Chaudoir 1861). Florida: Cerro Colorado (MLP).