Ocyolinus dimoui, Chatzimanolis & Ashe

Chatzimanolis, Stylianos & Ashe, James S., 2009, A revision of the neotropical genus Ocyolinus (Coleoptera: Staphylinidae: Staphylinini), Zootaxa 2162, pp. 1-23 : 12-14

Ocyolinus dimoui, Chatzimanolis & Ashe , new species

( Figs. 6 , 12, 33–36, 49)

Type Material. Holotype: male, with labels: “ Panama: Chiriquí Prov. La Fortuna, ‘Cont. Divide Trail’, 8°46’N, 82°12’W, 1080 m, 21–23.v.1995, J. & A. Ashe, #043, ex: flight intercept trap” / barcode label SM0058243 / “ Holotype Ocyolinus dimoui Chatzimanolis and Ashe , des. Chatzimanolis 2009” ( SEMC).

Diagnosis. Among Ocyolinus species with dark metallic purple coloration on head and pronotum, O. dimoui can be distinguished by the shape of the right mandible ( Fig. 6 ) and the shape of aedeagus: paramere apically strongly emarginated ( Fig. 36 ) and sensory spinules on ventral side of paramere arranged in two rows near lateral margins ( Fig. 36 ).

Description. Body length 16.2 mm.

Coloration. Head and pronotum metallic bright purple with green and blue overtones. Posterior dorsal margin of head without metallic coloration, appearing dark brown to black. Ventral surface of head and pronotum dark brown. Antennomeres 1–3 dark brown, 4–11 light brown. Mesoscutellum dark brown. Elytra similar to but sometimes brighter colored than head and pronotum. Abdomen dark brown, except posterior 1/ 5 of segment VII and VIII yellow. Legs brown.

Head slightly transverse, width: length ratio = 1.35. Surface of epicranium matt; with many micropunctures and with polygon-shaped microsculpture visible at> 70X; with several medium umbilicate setose punctures around margins of head, anteriorly and posteriorly, distance between puncture varies; medium size umbilicate punctures absent in medial longitudinal area but micropunctures present. Eyes medium, length of eyes / length of head = 0.45, 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. 6 ) with broad triangular medial tooth, left mandible with convex triangular tooth, right mandible with similar tooth but constricted at tip, distal part of mandible slightly curved. 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 shallow punctures and 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. 33–36 ; paramere in dorsal view fairly wide, converging to strongly emarginated apex, shorter than median lobe; in lateral view paramere almost straight; with sensory spinules in two lateral rows as shown in Fig. 36 . 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 only from the type locality in Panama, at elevations of 1080 m ( Fig. 49 ).

Habitat. Unknown, collected in flight intercept trap.

Remarks. According to the label information, O. dimoui and O. astenos are virtually sympatric. However, the coordinates on the label are not very precise and since the habitat information is not known for any of these two species, it is unclear if they are really sympatric. It could be argued that these are the same species and the differences in the mandibles and the aedeagi are intraspecific variation; however the variation observed is comparable to the interspecific variation seen among the other species in the genus.

Etymology. The species is named in honor of Mr. Nikos Dimou, a Greek writer.

Figures

FIGURE 49. Distribution map of Ocyolinus.

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 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.