Deltorhinum guyanensis, Génier, François, 2010

Génier, François, 2010, A review of the Neotropical dung beetle genera Deltorhinum Harold, 1869, and Lobidion gen. nov. (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 2693, pp. 35-48 : 40-42

Deltorhinum guyanensis sp. nov.

(Figs. 10–11, 23–25)

Diagnosis. Differs from all other species by its strongly upturned clypeus combined with a anterior pronotal margin medially lobate and pygidium minutely punctate.

Description. Holotype male: Body and legs black. Clypeus strongly upturned medially; median projection narrow and arcuate anteriorly; marginal bead concave and more or less glossy throughout. Gena sharply angular laterally. Frontal carina straight in dorsal view, median portion as high as lateral portions. Vertex finely punctate. Pronotal surface minutely punctate, with some weakly defined larger punctures on a small surface anteromedially; median longitudinal sulcus narrow and feebly impressed posteriorly, weakly defined anteriorly; anterior portion bluntly lobate medially, lobate portion preceded by a small flattened area. Pronotal basal surface with weakly defined larger punctures set on one row on most of width along posterior edge, punctate area wider on median fifth. Elytral surface finely punctate; striae fine and sharply defined, more deeply impressed on apical declivity, punctures rounded and encroaching on interstriae. Elytral epipleuron unmodified, hidden in dorsal view. Protibia with punctures scattered on dorsal surface. Profemur sharply carinate anteriorly. Mesofemora and metafemora simply convex ventrally. Mesotarsi and metatarsi with first tarsomere as long as width at apex. Pygidial surface minutely punctate throughout; basal sulcus finely rugose; apical marginal bead weakly defined internally.

Measurements (9 specimens): body length: 6.5–8.5 mm.

PLATE 2. Figs. 10–11, Deltorhinum guyanensis sp. nov. (paratype, female); Figs. 12–13, D. kempffmercadoi sp. nov. (holotype, female); Figs. 14–15, D. vazdemelloi sp. nov. (holotype, male); Figs. 16–17, D. robustum sp. nov. (holotype, female); Figs. 10, 12, 14, 16, habitus; Figs. 11, 13, 15, 17, head and pronotum, dorsal view.

Holotype 3 (CMNC): FRENCH GUIANA, Matoury (41.5 km SSW), 50 m, 4°37'22''N, 52°22'35''W, 26– 28.V.1997, J. Ashe & R. Brooks, FG1AB97, #060, ex: flight interc. trap / COLLECTION F. GÉNIER, P.Q. CANADA / WOLRD SCARAB. DATABASE, WSD00008009 / Holotype 3, Deltorhinum guyanensis sp. nov. F. Génier, 2010. Aedeagus extracted.

Material examined (43, 5ƤƤ): BRAZIL: AMAZONAS, Reserva Ducke, 26 km NE Manaus, iii.1995, M.G.V. Barbosa, plot A, FIT 2 - 13 (paratype) ( BMNH). GUYANA: Essequibo R., Moraballli Creek, 15.viii.1929. Oxf. Univ. Expedn. B.M. 1929-485, dark forest - 13 (paratype) ( BMNH). FRENCH GUIANA: CAYENNE, 18.4 km SSE Roura, elev. 240 m (4°36'38''N, 52°13'25''W), 29.v.–10.vi.1997, coll. J. Ashe & R. Brooks (1997-180) - 1Ƥ (paratype) ( CMNC); 20 km SW Cayenne, elev. 30 m (4°48'18''N, 52°28'41''W), 26- 28.v.1997, coll. J. Ashe & R. Brooks (1997-59) - 1Ƥ (paratype) ( CMNC); same locality, 29.v.–9.vi.1997, coll. J. Ashe & R. Brooks (1997-171) - 13 (paratype) ( CMNC); 41.5 km SSW Matoury, elev. 50 m (4°37'22''N, 52°22'35''W), 26–28.v.1997, coll. J. Ashe & R. Brooks (1997-60) - 13 (holotype) ( CMNC); SAINT- LAURENT-DU-MARONI, along Rue de Belizon trail, 1 km NW Les Eaux Claires, 7 km N Saül, elev. 280 m (3°39'46''N, 53°13'19''W), 4–8.vi.1997, coll. J. Ashe & R. Brooks (1997-167) - 1Ƥ (paratype) ( CMNC); along Rue de Belizon trail, 2.9 km NW Les Eaux Claires, 7 km N Saül, elev. 220–240 m (3°39'46''N, 53°13'19''W), 31.v.–3.vi.1997, coll. Ashe & Brooks (122) - 1Ƥ (paratype) ( CMNC); Mont Galbao, Saül, elev. 740 m (3°37'18''N, 53°16'42''W), 5–7.vi.1997, coll. J. Ashe & R. Brooks (1997-154) - 13 (paratype) ( CMNC).

Etymology. Guyanensis , a Latin adjective that refers to the area where most of the specimens have been collected.

Natural history. Unknown.

Variation. No variation noted except for size and coarseness of punctures on pronotal anteromedian depression.