Aegidinus cornutus Colby, 2009

Colby, Julia, 2009, Monographic revision of the genus Aegidinus Arrow (1904) and generic phylogeny of the world Orphninae (Coleoptera: Scarabaeidae: Orphninae)., Insecta Mundi 2009 (76), pp. 1-41 : 18-20

Aegidinus cornutus Colby , new species

Fig. 44-45 , 82-83

Type material. Holotype male at HAHC labeled: a) “ Sinop 12 o 31' S, 55 o 37' W // BR 163 km 500 a 600 / / Mato Grosso, Brasil // 350 m IX.1974 // Alvarenga & Roppa col.” (printed, rectangular label)/ b) “Coleção // M. Alvarenga ” (printed, rectangular label)/ c) “ H. & A. Howden Collection ex. A. Martinez coll.” (printed, rectangular label with a black border)/ d) my handwritten type label.

One paratype male at HAHC labeled: a) “Oct. 9 76 // Brasil // Minas Gerais // Sinópolis // Alvarengaleg. // Coll. Martínez” (handwritten on a rectangular label)/ b) “H. & A. Howden Collection ex. A. Martinez coll.” (printed, rectangular label with a black border)/ c) “ Aegidinus n. sp // Det. F. C. Ocampo 2005” (handwritten and printed, rectangular label with a black border)/ d) my printed paratype label.

Type Locality. Brazil, Mato Grosso, Sinop.

Description. Holotype male ( Fig. 83 ). Length 11.5 mm; width 6.4 mm. Color: Head, pronotum and elytra black to piceous. Venter and legs piceous to reddish brown. Head: Frons moderately convex medially, punctate; punctures sparse, small. Frontoclypeal suture obsolete. Clypeus moderately densely punctate, punctures small to moderate. Anterior margin of clypeus produced into slightly reflexed, subtriangular, erect or nearly erect horn with carina extending from base of horn to each eye canthus. Pronotum: Surface punctate; punctures moderately dense, moderate to large in size, concentrated on sides. Basal margin with impressed line and row of punctures. Disc of pronotum with transverse, oval, punctate fovea; punctures moderately dense to dense, occasionally contiguous, moderate to large in size, occasionally transverse. Anterior margin of pronotum with median, laterally compressed horn; apex broadly truncate and weakly emarginate. Elytra: Punctures of striae elongate or slightly vermiform, occasionally V-shaped at base. Stria 1 obsolete near base. Stria 2 obsolete halfway to apical umbone, with a few punctures at base. Lateral margin adjacent to humerus with 9 (right) or 10 (left) setose crenulations. Legs: Protibia without apical denticle. Genitalia: Fig. 44 -45 .

Paratype. One male. Length 10.7 mm; width 5.7 mm. The paratype differs from holotype in the following respects: Color: Reddish brown. Pronotum: Horn on anterior margin smaller, apex not emarginate. Elytra: Elytral punctures generally elongate, rarely vermiform or V-shaped; lateral margin adjacent to humerus with 6 (right) or 7 (left) setose crenulations.

Diagnosis. Male genitalia ( Fig. 44-45 ) are the primary means of identification for this species and are unique in form. The two type specimens examined both have pronounced pronotal horns, which is unique to this species. It is unclear if a minor male or female would have this character. Females are not known for this species.

Etymology. From the Latin “ cornutus ”, meaning bearing horns or horned, in reference to the unique pronotal horn of this species.

Distribution (Fig. 82). Brazil. Two specimens examined from HAHC. BRAZIL (2): Mato Grosso: Sinop (BR 163 km 500 a 600) (1). Minas Gerais: Sinópolis (1).

Temporal Distribution. September (1), October (1).

Natural History. The holotype was collected at an elevation of 350 m.

Figures

Figures 38-49. Male genitalia. Scale bar = 1 mm. 38) Parameres (frontal view) of Aegidinus brasiliensis. 39) Parameres and part of phallobase (lateral view) of A. brasiliensis. 40) Parameres (frontal view) of A. candezei. 41) Parameres and part of phallobase (left, lateral view) of A. candezei. 42) Ventral plate of A. candezei. 43) Parameres and part of phallobase (right, lateral view) of A. candezei.44) Parameres (frontal view) of A. cornutus. 45) Parameres and part of phallobase (lateral view) of A. cornutus. 46) Parameres (frontal view) of A. crypticus. 47) Parameres and part of phallobase (lateral view) of A. crypticus. 48) Ventral plate of A. crypticus.49) Lateral lobe of A. crypticus.

Figure 83- 87. Scale bar = 1 mm. 83) Lateral 3/4 habitus of A. cornutus. Arrow indicates tubercle. 84) Dorsal habitus of A. crypticus. 85) Lateral habitus of A. crypticus. Arrow indicates boss. 86) Lateral 3/4 habitus of A. guianensis. Arrow indicates tumosity.87) Dorsal habitus of A. guianensis. Arrow indicates fovea.