Glyptoma lescheni, Irmler, 2015

Irmler, Ulrich, 2015, The neotropical genus Glyptoma ERICHSON, 1839 with descriptions of new species and a key to the species (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 65 (2), pp. 297-325 : 310-311

Glyptoma lescheni spec. nov.

( Figs 8A, B , 21B )

Type material: male, Holotype: Bolivia: Santa Cruz Dept., 3.7 km SSE Buena Vista Hotel Flora y Fauna (63°33.15'W, 17°29.95'S), Chiquitano for. leaf litter, 400–440 m elev., 5.11.2002, leg. R. Leschen #BOL1L02-021 ( KNHM) . Paratypes: 1 male, 9 females with same data as holotype ( KNHM, UIC) ; Cochabamba, Cochabamba, 67.5 km NE, Est. Biol. Valle del Sajita , Univ. de San Simon (64°47.52'W, 17°06.33'S), 300 m elev., collected by flight intercept trap, 1 male, 1 female, 9.– 13.2.1999, leg. F. Genier #BOL1G99068 ( KNHM) ; Peru: Tambopata Prov., 15 km NE Pto., Maldonado , under bark, 200 m elev., 2 males, 3 females, 1.7.1989, leg. J. S. Ashe & R. Leschen #359 ( KNHM, UIC) ; Madre de Dios, Pakitza Bio. Stn., Castanal Trail, Reserved Zone , Manu National Park (71°17'W, 11°56.41'S), 317 m elev. collected by flight intercept trap, male, 15.– 16.10.2000, leg. R. Brooks # PERU 1B00013 ( KNHM) ; Junin, San Ramon de Pagoa , 40 km S Satipo, 750 m elev., 6 males, 4 females, 29.1.1974, leg. R. T. Schuh ( AMNH, UIC) ; Huanuco, Rio Llullapichis, Stat. Panguana (74°56'W, 9°37'S), Nov.–Dec. 2008, leg. F. Wachtel ( VAC) ; Columbia: Amazonas, PNN Amacayacu , San Martin (70°18'W, 3°46'S), 150 m elev., collected by Malaise trap, male, 29.12.2000 – 6.1.2001, leg. B. Amado # M1315 ( KNHM) .

Diagnosis: G. lescheni extremely resembles G. crassicorne ERICHSON, 1840 . It seems to be the sister species of G. crassicorne ERICHSON, 1840 in the Pre-Andean region from southern Columbia to Bolivia. The two species can be easily distinguished by the matt surface of the head in G. lescheni compared to the shiny surface in G. crassicorne ERICHSON, 1840 . The aedeagi of both species are also very similar. Up to date, I found no intermediate species between the northern G. crassicorne ERICHSON, 1840 with shiny head and the southern G. lescheni with matt head. If such specimens can be found in future, it must be considered that both species are forming one population with high variance in the head and pronotum microsculpture.

Description: Length: 2.7–2.9 mm. Colouration: Black; antennae dark brown, legs slightly lighter brown.

Head: 0.30 mm long, 0.47 mm wide; prominent eyes large; 1.5 times as long as temples; temples narrowed to neck in short convex curve; posterior edge of head slightly emarginate; sides in front of eyes to base of antennae parallel; clypeus short; narrowed in sinuate curve to anterior edge; anterior margin 1/3 as wide as width between base of antennae; setiferous punctation dense and extremely deep; on average, interstices between punctures slightly wider than diameter of punctures; isodiametric microsculpture deep; around deep punctures, microsculpture more elongate forming star-like patterns; surface matt.

Antennae slightly longer than head and pronotum combined; first antennomere slightly thicker than second; second and third antennomeres nearly twice as wide as long; following antennomeres as wide as second and wider than long; penultimate antennomeres slightly longer than basal antennomeres; only slightly wider than long; all antennomeres with long yellow setae; setae longer than length of antennomere; surface of antennomeres with deep isodiametric microsculpture.

Pronotum: 0.39 mm long, 0.49 mm wide; widest at middle; narrowed to anterior obtuse angles in smooth convex curve; posterior half deeply emarginate; posterior edge not wider than width of mesonotum; interstices between pseudo-punctures reduced to narrow ridges; partly coriaceous; setiferous punctation on ridges between deep and coarse pseudo-punctures; isodiametric microsculpture deep and dense restricted to surface of pseudo-punctures; on ridges, microsculpture weaker; surface matt; only surface of ridges slightly shiny.

Elytra: 0.60 mm long, 0.57 mm wide; sides smoothly rounded from shoulders to posterior angles; widest near middle; shoulders distinct, but obtusely rounded; discal carinae distinct from anterior margin to posterior margin; lateral carinae absent; pseudo-punctures as large as on pronotum, but less deep; in area between suture and discal carina three irregular longitudinal rows; inner row directly adjacent to suture; two irregular rows between discal carina and line from shoulders to posterior angles; interstices between pseudo-punctures restricted to narrow ridges; setiferous punctation on ridges between pseudo-punctures; with dense and deep isodiametric microsculpture; surface totally matt.

Abdomen with similar large and dense pseudo-punctures as on elytra; grooves equal on all segments; interstices between pseudo-punctures reduced to extreme narrow ridges; setiferous punctation on ridges between pseudopunctures; surface with dense and deep isodiametric microsculpture; matt.

Aedeagus strongly curved; angle between basal and apical lobe obtuse; nearly rectangular; short apex acute; sides of apical lobe with several sensillae; paramere thin and short; only reaching half of apical lobe.

Etymology: The species is named to honour the collector of the species Richard Leschen, who extensively collected in the Neotropics.

Figures

Figs 21: Fore body of Glyptoma crassicorne (A), G. lescheni (B), G. guianense (C), G. amazonense (D), G. guadelupense (E), G. hirticorne (F); scale bar 0.5 mm.

Figs 7–12: Aedeagus (A) and antenna (B) of Glyptoma crassicorne (7), G. lescheni (8), G. guianense (9), G. amazonense (10), G. guadelupense (11), G. hirticorne (12); scale bar: 0.1 mm.