Aegidinus crypticus 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 : 20

Aegidinus crypticus Colby , new species

Fig. 46-49 , 84-85 , 88

Type material. Holotype male at USNM labeled: a) “ Guyana: Mazaruni //- Potaro District; // Kartabo Point // 27 December 1982 // W.E. Steiner ” (printed, rectangular label)/ b) “ Aegidinus n.sp // Det F.C. Ocampo 2005” (handwritten and printed on a rectangular label with a black border)/ c) my handwritten holotype label.

Type Locality. Guyana, Cuyuni-Mazaruni District, Kartabo Point.

Description. Holotype male ( Fig. 84-85 ). Length 7.5 mm; width 3.9 mm. Color: Head, pronotum and elytra black to piceous. Legs and venter piceous to reddish brown. Head: Frons punctate to rugopunctate; punctures moderately dense to dense, small. Frontoclypeal suture obsolete. Clypeus punctate, becoming rugopunctate near eye canthus; punctures sparse, small. Anterior margin with marginal bead and small, slightly reflexed, median tubercle at apex; area behind tubercle tumid. Pronotum: Surface punctate; punctures moderately dense to dense, occasionally contiguous, moderate to large, concentrated on sides. Basal margin with bead and row of punctures, both becoming obsolete medially. Disc with shallow, punctate, suboval fovea; punctures sparse to dense, large. Anterior margin of pronotum with small, median boss. Scutellum: Surface divided longitudinally by impressed line. Elytra: Punctures of striae elongate, vermiform, V-, or U-shaped. All striae complete. Lateral margin adjacent to humerus with 4 setose crenulations. Legs: Protibia with apical denticle. Genitalia: Fig. 46-49 .

Diagnosis. This species is best distinguished from other species using the form of the male genitalia ( Fig. 46-59 ). The genitalia of this species are very similar to those of A. oreibates and A. howdenorum . The median lobes in A. crypticus ( Fig. 46 ) are longer and thinner than in A. oreibates ( Fig. 58 ). The shape of the ventral plate at the apex is much rounder in A.crypticus ( Fig. 48 ) than in A. oreibates ( Fig. 60 ). Aegidinus crypticus does not have a notch on the lateral margin of the lateral lobe (best seen in lateral view, Fig. 49 ), which is present in A. howdenorum ( Fig. 55 ) but not A. crypticus . There are no females known for this species.

Etymology. From the Greek “ krypto ”, meaning to hide, cover, or conceal, in reference to the difficulty in distinguishing this species from A. oreibates and A. howdenorum .

Distribution (Fig. 88). Guyana. One specimen examined from USNM. GUYANA (1): Cuyuni -Mazaruni District: Kartabo Point. Note: the Mazaruni-Potaro district was split in 1980. Today, Kartabo Point is in the Cuyuni-Mazaruni district.

Temporal Distribution. December (1).

Natural History. Nothing is known about the natural history of this species.

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.

Figures 50- 64. Male genitalia. Scale bar = 1 mm. 50) Parameres (frontal view) of A. guianensis. 51) Parameres and part of phallobase (lateral view) of A. guianensis. 52) Parameres (frontal view) of A. howdenorum. 53) Parameres and part of phallobase (lateral view) of A. howdenorum. 54) Ventral plate of A. howdenorum. 55) Lateral lobe of A. howdenorum. Arrow indicates notch. 56) Parameres (frontal view) of A. howeae. 57) Parameres and part of phallobase (lateral view) of A. howeae. 58) Parameres (frontal view) of A. oreibates. 59) Parameres and portion of phallobase (lateral view) of A. oreibates. 60) Ventral plate of A. oreibates. 61) Parameres (frontal view) of A. petrovi. 62) Parameres and part of phallobase (lateral view) of A. petrovi. 63) Parameres (frontal view) of A. teamscaraborum. 64) Parameres and part of phallobase (lateral view) of A. teamscaraborum.