Aegidinus tricornis 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 : 36-37

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Aegidinus tricornis Colby

new species

Aegidinus tricornis Colby , new species

Fig. 75 View Figures 65-77 , 93

Type Material. Holotype female at HAHC labeled: a) “Ven: Bolivar // 10 km N Corocito // 18. VI-3. VIII. 87 // S& J Peck, FIT // R. Caura rainforest”(printed, rectangular label)/ b) “ Aegidinus // guianensis // (Westw.) Det H.F. Howden 88”(handwritten and printed rectangular label with a black border)/ c)

my handwritten holotype label.

Paratypes: Two paratype females at CMNC

with same label data as holotype, but with my printed paratype label. One paratype female at

HAHC labeled: a) same as holotype / b) H. & A.

Howden Collection Ottawa, Canada ” (printed, rectangular label with a black border). One paratype female at CNMC labeled: a) same as holotype /b)

as (b) above /c) “ Aegidinus // nr. guianensis //

(West.) DET H. F. Howden 98” (handwritten and printed rectangular label with black border).

Type locality. Venezuela, Bolivar, Corocito (10

km N).

Description. Holotype female. Length 9.8 mm, Figure 93. Distributional map for A. tricornus , A. unicus , width 5.8 mm. Color: Head, pronotum, elytra, and A. venezuelensis .

legs, and venter piceous to reddish brown. Head:

Frons punctate; punctures moderately dense, moderate in size. Frontoclypeal suture present. Clypeus moderately densely punctate, punctures moderate in size. Anterior margin of clypeus with marginal bead. Pronotum: Surface punctate; punctures sparse to dense, large. Basal margin of pronotum with bead and row of punctures, punctures obsolete medially. Short, longitudinal, shallow sulcus present just anterior of basal margin. Anterior margin with small, median boss. Scutellum: One moderate sized puncture at base. Elytra: Punctures of striae elongate, vermiform, or V-shaped (at base). Stria 1 obsolete at base. Lateral margin adjacent to humerus with 7 setose crenulations. Genitalia: Fig. 75 View Figures 65-77 .

Paratypes. Four females. Length: 8.0- 9.8 mm; width 4.5-5.1 mm. Paratypes differ from holotype in the following respects: Head: Frontoclypeal suture present or not. Pronotum: Punctures on basal margin sometimes contiguous, forming a line. Sulcus anterior of basal margin expressed as a sulcus, a depression, or absent. Median boss on anterior margin present or not. Scutellum: Surface with a median puncture or not. Elytra: Stria 2 variably obsolete. Lateral margin adjacent to humerus with 5-7 setose crenulations.

Diagnosis. This species is best diagnosed using the female genital sclerites. The superior and inferior plates are fused, and the accessory sclerite projects from the face of the fused sclerites ( Fig. 75 View Figures 65-77 ). No males are known for this species.

Etymology. From the Latin “ tri ” meaning three and “ cornus ” meaning crowned, in reference to the appearance of a crown with three points given by the lobes on each mandible and the shape of the labrum.

Distribution (Fig. 93). Venezuela. Five specimens examined from CMNC and HAHC. VENEZUELA (5): Bolivar: Corocito (10 km N) (5).

Temporal Distribution. June-August (5).

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


Departamento de Geologia, Universidad de Chile


Colorado National Monument