Ocyolinus

Chatzimanolis, Stylianos & Ashe, James S., 2009, A revision of the neotropical genus Ocyolinus (Coleoptera: Staphylinidae: Staphylinini), Zootaxa 2162, pp. 1-23 : 22

Key to the species of Ocyolinus

With the exception of O. rugatus (rugose sculpture) and O. amethystinus (very few punctures on head and pronotum) the other species of Ocyolinus may be challenging to identify. The remaining species can be reliably identified based on the shape of the mandibles and the shape of the aedeagi; for these species females can only be identified in association with males.

1. Pronotum and head dark metallic brown, with transverse microsculpture; abdominal tergum III with a subbasal carina, median lobe of aedeagus with hook-like apical tooth ( Figs. 39 , 47 ) ................................................................ 2

- Pronotum and head dark metallic purple, sometimes appearing more green or blue, with polygon-shaped microsculpture; abdominal tergum III without a subbasal carina; median lobe of aedeagus without hook-like apical tooth ( Figs. 27 , 31 , 35 , 43 ) .................................................................................................................................................... 3

2. Pronotum and head with rugose sculpture ( Figs. 2 , 9 , 15); abdominal tergum IV with a complete subbasal carina; median lobe of aedeagus with large hook-like apical tooth ( Figs. 46–47 ) .................................................. O. rugatus

- Pronotum and head without rugose sculpture ( Figs. 7 , 13); abdominal tergum IV with a subbasal carina only medially; median lobe of aedeagus with small hook-like apical tooth ( Figs. 38–39 ) .................................. O. ganglbaueri

3. Pronotum and head with few or almost no punctures ( Figs. 1 , 4 , 10); mandibular teeth extremely elongate ( Figs. 1 , 4 ) .......................................................................................................................................................... O. amethystinus

- Pronotum and head with various punctation patterns ( Figs. 5–6, 8 , 11–12, 14); mandibular teeth never as elongate as in O. amethystinus ....................................................................................................................................................... 4

4. Apex of paramere emarginate ( Figs. 32 , 36 ); right mandible with tooth that is only slightly or not at all constricted at tip ( Figs. 5, 6 ) .............................................................................................................................................................. 5

- Apex of paramere rounded ( Fig. 44 ); right mandible with tooth that is constricted at tip ( Fig. 8 ) more than in any other described species (except O. amethystinus ) .......................................................................... O. nebulosus n. sp.

5. Apex of paramere strongly emarginated ( Fig. 36 ); sensory spinules on ventral side of paramere in two rows near lateral margins ( Fig. 36 ); right mandible with tooth that is slightly constricted at tip ( Fig. 6 ) ............... O. dimoui n. sp.

- Apex of paramere with a shallow emargination ( Fig. 32 ); sensory spinules on ventral side of paramere not in two clear rows, appearing more towards the middle instead of the lateral margins of paramere ( Fig. 32 ); right mandible with tooth that is not constricted at tip ( Fig. 5 ) .................................................................................. O. astenos n. sp.

Figures

FIGURES 37 – 40. Aedeagus of O. ganglbaueri. 37. Dorsal view. 38. Lateral view. 39. Detail of median lobe, lateral view. 40. Detail of paramere, ventral view.

FIGURES 45 – 48. Aedeagus of O. rugatus. 45. Dorsal view. 46. Lateral view. 47. Detail of median lobe, lateral view. 48. Detail of paramere, ventral view.

FIGURES 25 – 28. Aedeagus of O. amethystinus. 25. Dorsal view. 26. Lateral view. 27. Detail of median lobe, lateral view. 28. Detail of paramere, ventral view.

FIGURES 29 – 32. Aedeagus of O. astenos. 29. Dorsal view. 30. Lateral view. 31. Detail of median lobe, lateral view. 32. Detail of paramere, ventral view.

FIGURES 33 – 36. Aedeagus of O. dimoui. 33. Dorsal view. 34. Lateral view. 35. Detail of median lobe, lateral view. 36. Detail of paramere, ventral view.

FIGURES 41 – 44. Aedeagus of O. nebulosus. 41. Dorsal view. 42. Lateral view. 43. Detail of median lobe, lateral view. 44. Detail of paramere, ventral view.

FIGURES 1 – 3. Habitus photographs of Ocyolinus. 1. O. amethystinus, holotype. 2. O. rugatus, lectotype. 3. O. nebulosus, paratype.

FIGURES 4 – 9. Head of Ocyolinus. 4. O. amethystinus. 5. O. astenos. 6. O. dimoui. 7. O. ganglbaueri. 8. O. nebulosus. 9. O. rugatus.