Isanopus ashei, 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 : 1773-1779

publication ID	https://doi.org/ 10.1080/00222930802124057
persistent identifier	https://treatment.plazi.org/id/5C09879C-7769-1C06-7617-FDC85BD56BC8
treatment provided by	Carolina
scientific name	Isanopus ashei
status	sp. nov.

Treatment

Isanopus ashei View in CoL sp. n.

( Figures 2A View Figures 2 , 4A, 5A–C)

Diagnosis

This species along with I. hinojosai and I. sallaei has fewer and less dense punctures on the head and pronotum than other species of Isanopus . Isanopus ashei can be distinguished from all other species of Isanopus by the uniform colour of the abdomen (dark orange to rufous) in all visible segments and the shape of the aedeagus ( Figures 5 View Figure 5 A–C).

Description

Length 11.5–13 mm.

Colouration. Colour of head and pronotum brown to black. Antenna brown. Scutellum dark brown to black. Elytra brilliant metallic blue, greenish blue or purplish blue. Abdomen dark orange to rufous, anterior half of every segment slightly darker than posterior half. Legs dark brown.

Head. Head with relatively small brown microsetae and longer black macrosetae along borders of head; head subquadrate, width: length ratio51.18. Surface of epicranium glossy, with no micropunctures. Epicranium flat, with sparse mediumsized umbilicate setose punctures laterally, no punctures medially, setose punctures irregularly arranged in 2–3 rows anterior-posteriorly, punctures smaller around eyes, distance between punctures various, from 0.5–1 times width of punctures. Eyes medium, length of eyes/length of head50.46, distance between eyes as wide as 1.8 times length of eye. Postgena with large, longitudinally elongate punctures (about 3– 4 punctures/ 0.5 mm), punctures not uniformly distributed. Antennomeres 1–3 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 Figure 4. Antennae. (A) I. ashei . (B) I. sallaei . (C) I. eptaskouros . (D) I. tenuicornis . (E) I. hinojosai . Scale in Figure 4E 51.38 mm.

than wide, antennomere 11 subequal to previous antennomeres. Neck dorsally with no punctures or micropunctures, laterally with 1–2 small punctures.

Thorax. Pronotum longer than wide, width: length ratio50.84; 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 four 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 0.5–1 times width of puncture.

Elytra subequal in length to pronotum, with medium setose uniform punctures (5–6 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 subbasal (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 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; sternum IX with small emargination medially. Females: with no obvious sexual structures.

Aedeagus. As in Figures 5 View Figure 5 A–C; paramere extremely reduced; paramere: median lobe ratio50.23. Paramere in dorsal view fairly wide but expanding to two rounded 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 narrow apex; in lateral view becoming narrower and curved from middle to apex, apex with hook-like process.

Holotype. Male , with labels as follows: ‘‘ Panama , Chiriqui, 5.6 km N Boquete, La Culebra trail, 1490 m, 8 ° 499230N, 82 ° 259180W, vi.15.1996, J.S. Ashe and R. Brooks, PAN1AB96 159, ex: treefall/slash litter’’/[barcode label] ‘‘ SM0016597 ’’/‘‘ Holotype Isanopus ashei Chatzimanolis , design. Chatzimanolis 2007’’. In the collection of Snow Entomological Collection , Division of Entomology , Natural History Museum / BRC, University of Kansas, Lawrence . Paratypes, 13; with locality data as above and barcode labels: SM0016596 , SM0016598 , SM0016599 (3 in SEMC) ; COSTA RICA: San Jose Prov., 2.4 km ENE Sn Gerardo de Rivas, trail to Chirripo Natl. Park , 2070 m, 9 ° 27.939N, 83 ° 34.039W, vi.10.2004, J.S.Ashe, Z. Falin and I. Hinojosa, ex: treefall litter, barcode labels: SM0607677 , SM0607675 , SM0607676 (3 in SEMC) GoogleMaps ; San Jose, Zurqui de Moravia , 1600 m, 10 ° 39N, 84 ° 19W, i.1–30.1996, P. Hanson, ex: malaise, barcode labels: SM0133116 (1 in SEMC), (1 in UTCI) GoogleMaps ; San Jose Prov., 2.4 km ENE Sn Gerardo de Rivas, Cloudbridge Reserve , ridge above covered bridge, 1860 m, 9 ° 28.689N, 83 ° 34.009W, vi.11.2004, J.S.Ashe, Z. Falin and I. Hinojosa, ex: treefall litter, barcode label: SM0607686 (1 in SEMC) GoogleMaps ; San Jose Prov., San Juan , 14 km NE Finca Zurqui, 10 ° 29570N, 84 ° 09220W, 1490 m, vii.4–6.2000, J.S.Ashe, R . Brooks and Z. Falin, ex: flight intercept trap, barcode label SM0203734 (1 in SEMC) ; Cartago, P.N.Tapanti. 1740m, 9 ° 449300N, 83 ° 489300W, vi.4.1997, R . Anderson , ex: berlese forest litter, barcode label: SM0120360 (1 in SEMC) ; Cartago, P.N.Tapanti. 1150 m, 9 ° 459410N, 83 ° 47950W, vi.17–20.2000, J.S. Ashe and R . Brooks , ex: flight intercept trap, barcode label: SM0203331 (1 in SEMC) ; Heredia, Zurqui , 1600 m, ix.1–9.1998, FIT , C.W. and L.B. O’Brien (1 in FMNH). All paratypes with label ‘‘ Paratype Isanopus ashei Chatzimanolis design. Chatzimanolis 2007’’.

Etymology. This species is named in honor of the late J. Steve Ashe, friend and mentor, who inspired my Xanthopygina studies and collected the holotype.

Distribution. Known from elevations of 1150–2070 m in Costa Rica and Panama ( Figure 10 View Figure 10 ).

Habitat. Collected in treefall litter, malaise traps and flight intercept traps.

Isanopus eptaskouros sp. n.

( Figures 2D View Figures 2 , 4C, 6A, 6C)

Diagnosis

Isanopus eptaskouros can be distinguished from all other species in Isanopus by the colouration of abdominal segment VII. In I. eptaskouros it is completely dark brown-black, while in other species it is either yellowish-orange or a combination of dark brown-black and orange. Aedeagus ( Figures 6 View Figure 6 A–C) is also distinctive.

Description

Length 11–12.5 mm.

Colouration. Colour of head and pronotum dark brown-black. Antenna brown. Scutellum dark brown-black. Elytra bright metallic blue, purplish blue, sometimes with green overtones. Abdomen dark brown, except segments VIII–IX yellow. Legs dark brown. Head, pronotum and abdomen integument appearing iridescent under direct light.

Head. Head with many relatively small brown microsetae and longer black macrosetae along borders of head; head subquadrate, width: length ratio50.91. Surface of epicranium glossy, with few micropunctures distributed at centre. Epicranium slightly convex, with small-sized umbilicate setose punctures covering head except medially, punctures only slighter smaller around eyes and at base of head, distance between punctures various, from 0.5–1 times width of punctures at centre, but punctures at antero-lateral and posterior part of head almost confluent. Eyes medium, length of eyes/length of head50.60, distance between eyes as wide as 1.6 times length of eye. Postgena with medium to large, not longitudinally elongate punctures (about eight punctures/ 0.5 mm), punctures 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 about 1.5 times as long as antennomere 2, antennomere 4 slightly shorter than antennomere 3, antennomeres 5–7 almost identical, twice as long as wide, antennomeres 8–10 almost identical, shorter than 5– 7, antennomere 11 longer than previous antennomeres. Neck with multiple small irregular punctures and micropunctures posteriorly.

Thorax. Pronotum longer than wide, width: length ratio50.90; antero-lateral angles obtusely rounded, slightly curved. Lateral margins of pronotum concave in dorsal aspect, pronotum broadest in apical 1/3 and narrower at basal angles. Surface of pronotum flat, glossy, with micropunctures. Setose punctures absent on disc of pronotum, laterally present in 4–5 rows, distance between rows smaller towards lateral ends; punctures of medium size (about four punctures/ 0.5 mm); the least distance between punctures for each row various, 1–2 times width of puncture for most; antero-lateral angles densely punctuated, distance between punctures 0.5–1 times width of puncture. 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 dense punctures, punctures confluent.

Elytra subequal in length to pronotum, with medium setose uniform punctures (about seven punctures/ 0.5 mm), covered with yellowish brown microsetae and longer black macrosetae along borders of elytra.

Legs. Protarsus enlarged; meso and metatarsi slightly elongate and 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 subbasal (arch-like) carina. Terga III–VII with uniform punctuation patterns, densely covered with punctures and yellowish brown setae, punctures not decreasing in size gradually from III–VII. Abdominal sterna III–IV with moderate transverse impressions, V with faint transverse impression, shining. Integument surface appearing strongly iridescent in strong direct light at moderate to high magnification. Sterna III–VII densely punctuated, punctures not 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.

Aedeagus. As in Figures 6 View Figure 6 A–C; paramere slightly reduced; paramere: median lobe ratio50.74. Paramere in dorsal view almost parallel-sided converging to rounded tip; in lateral outline almost straight, with two rows of spinules. Median lobe in dorsal view wide, almost parallel-sided, constricted to a narrower rounded apical lobe; in lateral view becoming narrower from middle to apex, apex with a small dorsal tooth, rounded. Holotype, male, with labels as follows: ‘‘ Peru: Cuzco Dept., Consuelo, Manu Rd. km 165, x.7.1982’’/‘‘FMHD #82-350, ex litter under crown of felled tree. L. E. Watrous and A. C. Mazurek’’/‘‘ Isanopus det. Newton 1992’’/‘‘ Holotype Isanopus eptaskouros Chatzimanolis , design. Chatzimanolis 2007’’. In the collection of the Field Museum of Natural History, Chicago. The type locality is also known as ‘‘ 15.9 km SW Pilcopata, 13.02369S, 71.491859W’ ’ ( Patterson et al. 2006). Paratypes: 3, with same first locality label as the holotype, and subsequent labels for each: ‘‘FMHD #82-319, ex leaf litter. L. E. Watrous and A. C. Mazurek’’; ‘‘FMHD #82- 356, ex beating palm branches. L. E. Watrous and A. C. Mazurek’’; and ‘‘FMHD #82-332, ex rotten palm. L. E. Watrous and A. C. Mazurek’’. All paratypes with label ‘‘ Paratype Isanopus eptaskouros Chatzimanolis design. Chatzimanolis 2007’’. In the collection of the Field Museum of Natural History, Chicago.

Etymology. The specific epithet is the combination of two Greek words, the word epta (EPTA) that means seven and the word skouros (SK o MR o z) that means dark, and refers to the abdominal segment VII that is completely dark brown to back. The epithet is a noun in apposition.

Distribution. Known from Cuzco Dept. in Peru ( Figure 11 View Figure 11 ).

Habitat. Collected in rotten palms, and leaf litter of rotten trees.