Isanopus hinojosai, Chatzimanolis, 2008

Chatzimanolis, Stylianos, 2008, A revision of the neotropical beetle genus Isanopus Sharp, 1876 (Coleoptera: Staphylinidae: Staphylinini), Journal of Natural History 42 (25 - 26), pp. 1765-1792 : 1779-1781

Isanopus hinojosai sp. n.

( Figures 2C , 3A, 3E , 4E, 7A–C)

Diagnosis

This species along with I. ashei and I. sallaei has fewer and less dense punctures on the head and pronotum than other species of Isanopus . It can be distinguished from all other species in the genus by the gradient colouration of the abdomen (see colouration section below) and the distinctive aedeagus ( Figures 7 A–C).

Description

Length 12–13.4 mm.

Colouration. Colour of head and pronotum brown to black with greenish overtones. Antenna yellow, except colour of antennomeres 1–3, dark yellow to brown. Scutellum dark brown to black. Elytra dark metallic blue, or purplish blue. Abdomen with gradient dark brown to yellow, usually segments II–IV dark brown, V–VI brown to dark yellow, VII–IX yellow. Legs dark brown except tarsi light brown.

Head. Head with relatively small brown microsetae and longer black macrosetae along borders of head; head slightly transverse, width: length ratio51.28. Surface of epicranium glossy, with very few micropunctures distributed at centre. Epicranium flat, with sparse medium sized umbilicate setose punctures laterally, no punctures medially, setose punctures irregularly arranged in 3–4 rows anterior-posteriorly, punctures smaller around eyes, distance between punctures various, 0.5–1 times width of punctures. Eyes medium, length of eyes/length of head50.49, distance between eyes as wide as 1.8 times length of eye. Postgena with large, longitudinally elongate punctures (about four punctures/ 0.5 mm), punctures not uniformly distributed. Antennomeres with long macrosetae, antennomere 1 gradually club-like thickened, antennomeres 1–11 longer than wide, antennomere 1 about twice as long as antennomere 2, antennomere 3 1.5 times longer than antennomere 2, antennomere 4 slightly shorter than antennomere 3, antennomeres 5–10 almost identical, 3.5 times longer than wide, antennomere 11 subequal to previous antennomeres. Neck dorsally with no punctures or micropunctures, laterally with 3–4 small punctures.

Thorax. Pronotum longer than wide, width: length ratio50.89; antero-lateral angles obtusely rounded, curved. Lateral margins of pronotum concave in dorsal aspect, pronotum broadest in apical 1/4 and narrower at basal angles. Surface of pronotum flat, glossy, with no micropunctures. Setose punctures absent on disc of pronotum, laterally present in 3–4 rows, distance between rows smaller towards lateral ends; punctures of medium size (about 4 punctures/ 0.5 mm); least distance between punctures for each row various, 1–2 times width of puncture for most. Pronotum with brown microsetae directed postero-medially in lateral and anterior areas and posteriorly in basal half, and few longer black macrosetae along borders. Scutellum prominent, with brown microsetae and sparse punctures, least distance between punctures 1–1.5 times width of puncture. Elytra subequal in length to pronotum, with medium setose uniform punctures (about six punctures/ 0.5 mm), covered with yellowish brown microsetae and longer black macrosetae along borders of elytra.

Legs. Protarsus enlarged; meso and metatarsi elongate, enlarged, tarsomeres 1–4 asymmetrical, dilated distally. Legs almost completely covered with long yellow and brown setae.

Abdomen. Abdominal terga III–V with tergal basal and no sub-basal (arch-like) carina. Terga III–VII with uniform punctuation patterns, densely covered with punctures and yellowish brown setae, punctures decreasing in size gradually from III–VII. Abdominal sterna III–IV with moderate transverse impressions, V with faint transverse impression, shining. Integument surface appearing slightly iridescent in strong direct light at moderate to high magnification. Sterna III–VII densely punctuated, punctures decreasing in size gradually from III–VII, with yellowish brown setae. Lateral tergal sclerites of the abdominal segment IX long and straight, covered with long black macrosetae.

Secondary sexual structures. Male: distal margin of sternum VII with slight emargination medially; sternum VIII with deep V-shaped emargination medially ( Figure 3C ); sternum IX with small emargination medially. Females: with no obvious sexual structures.

Aedeagus. As in Figures 7 A–C; paramere extremely reduced; paramere: median lobe ratio50.34. Paramere in dorsal view fairly wide but expanding to two apical processes, with a wide U-shaped emargination between them; in lateral outline almost straight; with no apparent sensory spinules. Median lobe in dorsal view wide, converging to apex; in lateral view becoming narrower and curved from middle to apex. Holotype, male with labels as follows: ‘‘ COSTA RICA: Puntarenas Prov. Altamira Biol. Sta., 1510-1600 m, 09 ° 01.769N, 83 ° 00.499W, vi.7.2004, J.S. Ashe, Z. Falin, I. Hinojosa, ex: treefall litter’’/ [barcode label] ‘‘SM0607654’’/‘‘ Holotype Isanopus hinojosai Chatzimanolis , design. Chatzimanolis 2007’’. In the collection of INBio, Costa Rica. Note that the holotype is currently housed in Snow Entomological Collection, Division of Entomology, Natural History Museum/BRC, University of Kansas, Lawrence but based on a collecting agreement between the two institution the holotype would be transferred to INBio. Paratypes: 13, same locality label as above, barcode labels SM0607656, SM0607655, SM0607657, SM0607557, SM0607653 (5 in SEMC), SM0607658 (1 in UTCI); same data except vi.6.2004, SM0607670 (1 in SEMC); same data except vi.5.2004, SM0607584, SM0607587, SM0607586, SM0607588, SM0607585 (5 in SEMC); PANAMA: Chiriqui, Finca La Suisa, 24 km S Gualaca, 8 ° 349N 82 ° 129W, 1285 m v.31.2000, HandA Howden, barcode label SM0235827 (1 in SEMC). All paratypes with label: ‘‘ Paratype Isanopus hinojosai Chatzimanolis , design. Chatzimanolis 2007’’.

Etymology. This species is named in honor of Ismael Hinojosa-Diaz, who collected many of the specimens of the type series.

Distribution. Known from elevations of 1285–1600 m in Costa Rica and Panama ( Figure 10 ).

Habitat. Collected in treefall litter.

Figures

Figures 2. Isanopus species, dorsum of head and pronotum. (A) I. ashei. (B) I. sahlbergi. (C) I. hinojosai. (D) I. eptaskouros.

Figure 3. Isanopus hinojosai. (A) Left mandible, ventral aspect. (B) Right mandible, dorsal aspect, scale for 7–850.25 mm. (C) Abdominal sterna VII–VIII, scale50.81 mm. (D) Labium and hypopharynx, scale50.32 mm. (E) Left maxillae, ventral aspect, scale50.36 mm.

Figure 7. Aedeagus of I. hinojosai. (A) Dorsal view. (B) Lateral view. (C) Detail of paramere, dorsal view.

Figure 10. Distribution map of I. ashei, I. hinojosai and I. sallaei.