Aegidinus Species (Males)

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 : 14

Key to Aegidinus Species (Males)

For a description of terms applied to genitalia, refer to the Materials and Methods section and Fig. 5-

6. Sternite six in males is emarginated, but entire in females.

1. Protibia with apical denticle ( Fig. 14 ). Phallobase with or without ventral plate ( Fig. 42, 48 , 54, 60 ). ............................................................................................................................................. 4

— Protibia without apical denticle. Phallobase without ventral plate. ............................................ 2

2 (1). Parameres not broad, flattened, and paddle-like. Lateral lobes folded over and partially concealing median lobes ( Fig. 6 , 38-39 , 56-57 ). ........................................................................................... 3

— Parameres broad, flattened, and paddle-like. Lateral lobes not folded over and partially concealing median lobes ( Fig. 44-45 ) ............................................................... A. cornutus Colby , n. sp.

3 (2). Parameres with sickle-shaped anterior angles of lateral lobes touching medially. ( Fig. 6 , 38 ) .... ............................................................................................................. A. brasiliensis Arrow

— Parameres with sickle-shaped anterior angles of lateral lobes not touching medially ( Fig. 56 ) ... .......................................................................................................... A. howeae Colby , n. sp.

4 (1). Phallobase with ventral plate ( Fig. 42, 48 , 54, 60 ) ..................................................................... 5

— Phallobase without ventral plate ( Fig. 50-51, 61-64 ) .................................................................... 8

5 (4). Parameres (especially median lobes) twisted ( Fig. 40-43 ) .............................................................. .................................................................................. A. candezei (Preudhomme de Borre)

— Parameres (especially median lobes) not twisted ( Fig. 46-55, 58-64 ) .......................................... 6

6 (5). Ventral plate generally rectangular at apex ( Fig. 60 ), usually more than 6 times longer than wide (width measured at suture to phallobase); median lobes stout at apices ( Fig. 58 ) ..................... ........................................................................................................ A. oreibates Colby , n.sp.

— Ventral plate rounded ( Fig. 48 , 54 ), less than 5 times as long as wide; median lobes slender at apices ( Fig. 46 , 52 ) .................................................................................................................... 7

7 (6). Lateral lobe of each paramere with notch in lateral view ( Fig. 55 ) ............................................... ................................................................................................. A. howdenorum Colby , n.sp.

— Lateral lobe of each paramere without notch in lateral view ( Fig. 49 ) .......................................... ........................................................................................................ A. crypticus Colby , n.sp.

8 (4). Lateral lobe of each paramere positioned above median lobes ( Fig. 50-51 ) .................................... ..................................................................................................... A. guianensis (Westwood)

— Lateral lobe of each paramere not positioned above median lobes ( Fig. 61-64 ) ........................... 9

9 (8). Median lobe of each paramere longer than lateral lobe in lateral view ( Fig. 64 ); length of entire phallobase less than 3 mm. ............................................ A. teamscaraborum Colby , n. sp.

— Median lobe of each paramere not longer than lateral lobe in lateral view ( Fig. 62 ); length of entire phallobase greater than 3 mm. ......................................................... A. petrovi Colby , n. sp.

Figures

Figure 1-9. Scale bar = 1 mm. 1) Mouthparts exposed beyond clypeus. a) Labrum exposed beyond edge of clypeus. b) Single, external, lateral lobe on mandibles. 2) Apical spines of metatibia (indicated by arrows) separated by basal metatarsal segment. 3) Female genital sclerites of Aegidinus brasiliensis Arrow. a) Superior sclerite. b) Inferior sclerite. c) Interior process. 4). Female genital sclerites of A. oreibates Colby. a) Superior sclerite. b) Inferior sclerite. c) Accessory sclerite. 5) Male parameres (frontal view) of A. oreibates. a) Lateral lobe. b) Median lobe. 6) Male parameres (frontal view) of A. brasiliensis. a) Lateral lobe. b) Median lobe. 7) Male parameres and phallobase (lateral view) of A. guianensis (Westwood). a) Lateral lobe. b) Median lobe. c) phallobase. d) Basal piece of phallobase. 8) Attachment of first antennal club segment to stem offset (Hybalus sp.). 9) Attachment of first antennal club segment to stem not offset (Orphnus sp.).

Figure 10-14. 10) Mandible of Aegidinus sp. Arrow indicates single, external, lateral lobe. Scale bar = 100 m. 11) Mandible of Aclopus sp. Scale bar = 1 mm. 12) Mandible of Aegidium sp. a) Mesal mandibular brush. b) Mandibular prostheca. Scale bar = 1 mm. 13) Galea of Paraegidium sp. Arrow indicates trapezoidal distagalea. 14) Protibia of Aegidinus sp. Arrow indicates apical denticle. Scale bar = 1 mm.

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.

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.