Passalus (Passalus) unicornis LePeletier & Serville 1825

Jiménez-Ferbans, Larry, Reyes-Castillo, Pedro & Schuster, Jack C., 2015, Passalidae (Coleoptera: Scarabaeoidea) of the Greater and Lesser Antilles, Zootaxa 3956 (4), pp. 491-512 : 497-498

Passalus (Passalus) unicornis LePeletier & Serville 1825

( Fig. 8 )

Type locality. Cayenne, French Guiana.

Diagnosis. 36.6–45.0 mm total length. Clypeus hidden below frons, not visible dorsally, with anterior angles developed. Frons border with two secondary mediofrontal teeth contiguous at base or separated by a distance slightly less than the distance separating the secondary mediofrontal tooth from its respective mediofrontal tooth. Frontal fossae glabrous. Medio-frontal tubercles developed. Interior tubercles equal size to medio-frontal tubercles, located on the base of the exterior side of medio-frontal tubercles. Central tubercle of MFS with apex very free, reaching anterior border of frons; basolateral tubercles marked. Antennal club trilamellate. Apex of lacinia bidentate. Mentum with medial base swollen and glabrous. Prosternal process rhomboidal, truncate. Mesosternum glabrous with scars marked and elongate. Antero-lateral metasternum and lateral groove pubescent, disc delimited by punctures excluding apical edge. Humeri pubescent, epipleura pubescent in most of its length.

Material examined. 42 specimens. DOMINICA: Saint Andrew, 3.VIII.1973. Camb. leg. (1 IEXA). GUADELOUPE: Guadeloupe, 1968, P. Gallichet leg. (11 IEXA); Grand Fond S.A., 20.VIII.1977, F-C. M. Chalumeau, leg., Passalus (Passalus) unicornis Lep. et Serv., 1825 Reyes-Castillo , det. 80 (2 IEXA); Neuf Château, Ste. Marie, 1.VII.1971, col. L. Gruner, Passalus (Passalus) unicornis Lep. et Serv., 1825 det.: Jiménez- Ferbans, 2012 (12 IEXA); Sofaia, 285 m, 3.XII.1982, J.C. Schuster, Passalus unicornis (15 UVGC). Morne Louis, 660 m, 3.XII.1982, J.C. Schuster, Passalus unicornis LeP. et Serv. det.: Jiménez-Ferbans, 2013 (1 UVGC).

Distribution. Brazil, Colombia, Dominica, French Guiana, Guadeloupe, Martinique, Saint Lucia, Trinidad and Tobago ( Percheron 1835, Luederwaldt 1931, Chalumeau & Gruner 1974, Chalumeau 1978, Cartwright & Chalumeau 1978, Ivie & Gillogly 1998, Peck et al. 2002, Peck 2006).

Comments. Hunt (1981) described four new Nematoda from the midgut caeca of P. unicornis from Saint Lucia. Schuster (1992) recorded P. unicornis from Trinidad and Guadeloupe; however, the specimens cited by Schuster (1992) from Trinidad were actually P. coarctatus .

Figures

FIGURES 5 – 8. Head and pronotum, dorsal view. 5. Passalus interstitialis. 6. P. trinesides. 7. P. punctiger. 8. P. unicornis. Scale bars: 1 mm.