Ocyolinus nebulosus, Chatzimanolis & Ashe

Chatzimanolis, Stylianos & Ashe, James S., 2009, A revision of the neotropical genus Ocyolinus (Coleoptera: Staphylinidae: Staphylinini), Zootaxa 2162, pp. 1-23 : 16-18

Ocyolinus nebulosus, Chatzimanolis & Ashe , new species

( Figs. 3 , 8 , 14, 41–44, 49)

Type material. Holotype: male, with labels: “ Panama: Chiriquí Prov., Hornito, Finca La Suiza, ca. 8°39’N, 82°12’W, 1220 m, 6.vi.2000 ” / “ FMHD #2000-171, flight intercept trap, H. A. Howden, Field Mus. Nat. His.” / “ Holotype Ocyolinus nebulosus Chatzimanolis and Ashe , des. Chatzimanolis 2009” ( FMNH). Paratypes (43): with labels as the holotype (1 FMNH); “ Panama: Darién, Cana Biological Station, Serrania de Pirre, 1380 m, 4–7.vi.1996, J. Ashe, R. Brooks, PAN1AB96 107, ex: flight intercept trap” / barcode label SM0006981 (1 SEMC); “ Panama: Coclé, 7.2 km N El Copé, 730 m, 8°37’N, 80°35’W, #140, 20.v–7.vi.1995, J. Ashe, R. Brooks, flt. Intercept trap” / barcode label SM0003427 (1 SEMC); “ Panama: Chiriquí Prov., nr. Bajo Boquete; Pate de Machu Mt., 11.viii.1983, Louis N. Sorkin collector, leaf litter sift” (1 AMNH).

Diagnosis. Among Ocyolinus species with dark metallic purple coloration on head and pronotum, O. nebulosus can be distinguished by the shape of the right mandible ( Fig. 8 ) and the shape of aedeagus: paramere apically rounded ( Fig. 44 ) and sensory spinules as shown in Fig. 44 .

Description. Body length 14.0– 16.5 mm.

Coloration. Head and pronotum metallic bright purple with green and blue overtones but one paratype appearing more metallic green. Posterior dorsal margin of head without metallic coloration, appearing dark brown to black. Ventral surface of head and pronotum dark brown. Antennomeres light brown. Mesoscutellum dark brown. Elytra similar to but sometimes brighter colored than head and pronotum. Abdomen brown to dark brown, except posterior 1/5 of segment VII and VIII yellow. Legs light brown.

Head slightly transverse, width: length ratio = 1.25. Surface of epicranium matt; with many micropunctures and with polygon-shaped microsculpture visible at> 70X; with several medium sized umbilicate setose punctures around margins of head and posteriorly, distance between puncture varies; medially with few setose punctures and with micropunctures. Eyes medium, length of eyes / length of head = 0.46, distance between eyes as wide as twice length of eye. Postgena with medium, deep punctures (about 1–2 punctures / 0.5 mm), punctures not uniformly distributed. Mandibles ( Fig. 8 ) with broad triangular medial tooth, left mandible with convex triangular tooth, right mandible with similar tooth but constricted at tip, distal part of mandible straight. Antennomeres with long macrosetae, antennomeres 1–11 longer than wide, antennomere 1 slightly curved, about 2.5 times as long as antennomere 2, antennomere 3 1.6 times as long as antennomere 2, antennomere 4 0.75 times as long as antennomere 3, antennomeres 6 slightly shorter than either antennomere 5 or 7, antennomere 7–10 gradually becoming shorter, antennomere 11 slightly longer than antennomere 10. Neck dorsally with micropunctures and rounded microsculpture, laterally with 3–4 small punctures.

Pronotum subquadrate, width: length ratio = 0.97; antero-lateral angles obtusely rounded, curved downwards. Lateral margins of pronotum concave in dorsal aspect, pronotum broadest in apical 1/4 and narrower at basal angles. Surface of pronotum flat; matt due to microsculpture and micropunctures. Medium sized punctures throughout the pronotum, irregularly arranged. Large setose punctures present around the margin of pronotum, with 4 punctures at the center of the pronotum, each one delimiting the corner of a square. Pronotum with few long black macrosetae along borders. Mesoscutellum prominent, anterior half with transverse microsculpture, posterior half with microsculpture and with brown microsetae and punctures, punctures confluent.

Elytra subequal in length to pronotum, with large setose uniform punctures (about 7 punctures / 0.5 mm), punctures confluent; with long yellow macrosetae along borders of elytra. Elytra appearing glossy, without microsculpture but with tiny micropunctures between larger punctures visible only at> 70X.

Legs. Protarsus moderately enlarged, with yellow setae; meso- and metatarsi not enlarged. Legs almost completely covered with long yellow and brown setae.

Abdominal terga III–VII with tergal basal and no subbasal (arch-like) carina. Terga III–VII with uniform punctation patterns, densely covered with punctures and yellowish brown setae, with polygon-shaped microsculpture on anterior part. Setae on abdominal terga and sterna appearing iridescent. Sterna III–VII moderately punctuated, with rounded microsculpture. Lateral tergal sclerites of the abdominal segment IX long and straight, covered with long brown macrosetae.

Secondary sexual structures. Male: distal margin of sternum VII with slight broad emargination medially; sternum VIII with shallow V-shaped emargination medially; sternum IX with deep V-shaped emargination medially. Female unknown.

Aedeagus as in Figs. 41–44 ; paramere in dorsal view fairly wide, converging to rounded apex, shorter than median lobe; in lateral view paramere slightly concave, straight; with sensory spinules as shown in Fig. 44 . Median lobe in dorsal view wide, converging to rounded apex, with a pair of dorsal teeth; in lateral view becoming narrower from middle to apex.

Distribution. Known from elevations of 730–1380 m in Panama ( Fig. 49 ).

Habitat. Collected in leaf litter and flight intercept traps.

Etymology. The specific epithet is derived from the Latin word nebula (cloudy, misty) and refers to the punctation pattern of the micropunctures on the pronotum. The epithet is an adjective.

Figures

FIGURE 49. Distribution map of Ocyolinus.

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.

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.