Aegidinus crypticus Colby,

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

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Aegidinus crypticus Colby

new species

Aegidinus crypticus Colby  , new species

Fig. 46-49View Figures 38-49, 84-85View Figure 83- 87, 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. 84-85View Figure 83- 87). 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. 46-49View Figures 38-49.

Diagnosis. This species is best distinguished from other species using the form of the male genitalia ( Fig. 46-59View Figures 38-49View Figures 50- 64). The genitalia of this species are very similar to those of A. oreibates  and A. howdenorum  . The median lobes in A. crypticus  ( Fig. 46View Figures 38-49) are longer and thinner than in A. oreibates  ( Fig. 58View Figures 50- 64). The shape of the ventral plate at the apex is much rounder in A.crypticus  ( Fig. 48View Figures 38-49) than in A. oreibates  ( Fig. 60View Figures 50- 64). Aegidinus crypticus  does not have a notch on the lateral margin of the lateral lobe (best seen in lateral view, Fig. 49View Figures 38-49), which is present in A. howdenorum  ( Fig. 55View Figures 50- 64) 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.


Smithsonian Institution, National Museum of Natural History