Sagola chathamensis Park and Carlton

Park, J. - S. & Carlton, C. E., 2014, A revision of the New Zealand species of the genus Sagola Sharp (Coleoptera: Staphylinidae: Pselaphinae: Faronitae), The Coleopterists Bulletin (mo 13) 68, pp. 1-156 : 68

Sagola chathamensis Park and Carlton , new species

( Figs. 37c , 38c, 38k , 39 )

Type Material. Holotype. NEW ZEALAND: Chatham Islands: 1♂ ( LUNZ), aedeagus dissected and mounted in balsam on a clear plastic card, “ NEW ZEALAND, CH Mangere I Robin Bush 28.x.1993 R. M. Emberson ”, “litter ex Olearia , Melicytus , Muehlenbeckia forest and feathers”, “ HOLOTYPE Sagola chathamensis Park and Carlton 2013 ” . Paratypes (n = 23: 14 males; 9 females). NEW ZEALAND: Chatham Islands : 3♂♂ 5♀♀ ( LUNZ), same data as holotype ; 2♂♂ 1♀ (1♀, slide-mounted; LUNZ), Star Keys , 23 I 1998, R. M. Emberson, under rocks in coastal sward ; 4♂♂ ( LUNZ), Mangere, Robin Bush , 30 XI 2004, R. M. Emberson, P. Syrett, from leaf litter ; 1♂ ( LUNZ), Star Keys , 23 I 1998, J.W.M. Marris, under rock in low coastal vegetation ; 1♂ ( LUNZ), Mangere I, Robin Bush , 30 XI–3 XII 1992, J.W.M. Marris, J.W. Early, pitfall trap ; 2♂♂ 2♀ (1♂, slide-mounted, NZAC), Taiko Camp , 10 XI 1991, J.S. Dugdale, sifted rotten wood ; 1♀ ( LUNZ), Mangere I, 28 X 1993, R. M. Emberson, litter ex coastal scrub LCNZ 93 /10 ; 1♂ ( NZAC), Rungaika , 240–260m, 6 III 1991, R. C. Craw, litter 91/14 .

Etymology. This species is named after the type locality, Chatham Islands.

Diagnosis. This species can be distinguished from the other species of the auripila speciesgroup by the following combination of characters: body smaller, length 1.8–2.0 mm; ventral surface of head weakly convex; eye small, approximately one-third length of temple; frontal sulcus deep and linear, almost reaching vertexal fovea; anterior frontal fovea round and covered by frontal rostrum; posterior frontal fovea elongate; shape of antennomeres and genitalia unique to species.

Description. Length 1.8–2.0 mm. Body brown, antennae, maxillary palpi, elytra, and legs paler ( Fig. 37c ). Head: Male head as long as wide, widest across eyes ( Fig. 38k ), ventral surface of head weakly convex. Antennomere 1 approximately 1.5 times longer than wide, 2 longer than wide, 3–7 subquadrate, 8–10 weakly transverse. Frontal sulcus deep and linear, reaching almost vertexal fovea. Anterior frontal fovea round and covered by frontal rostrum, posterior frontal fovea elongate. Eye small, approximately onethird length of temple. Thorax: Prosternum as long as wide, widest at one-third length. Elytra approximately triangular ( Fig. 37c ). Meso- and metathorax trapezoidal, longer than wide. Aedeagus: Median lobe bent S-shaped ( Fig. 38c ). Phallobase of median lobe symmetrical and rectangular ( Fig. 38c ). Parameres symmetrical and weakly curved with 1 seta apically and 3 setae on middle ( Fig. 38c ).

Distribution. Chatham Islands ( Fig. 39 : black square).

Habitat. Specimens of this species were collected using pitfall traps or by sifting forest litter in a coastal area.

Figures

Fig. 37. Habitus of Sagola species in the auripila species-group, dorsal views. a) S. auripila, b) S. spiniventris,

Fig. 38. Sagola species in the auripila species-group. Aedeagi, dorsal views: a) S. auripila, b) S. spiniventris, c) S. chathamensis, d) S. pittensis, e) S. chandleri, f) S. threekingsensis, g) S. gimmeli, h) S. sokolovi, lateral view, i) S. sokolovi. Dorsal surface of male head: j) S. spiniventris (arrow indicates wide frontal sulcus), k) S. chathamensis (arrow indicates narrow frontal sulcus). Scale bars = 0.1 mm.

Fig. 39. Known collection localities of New Zealand Sagola species. S. auripila: black circles; S. spiniventris: triangles; S. chathamensis: black square.