Neosampa granulata Broun, 1921

Nomura, Shûhei & Leschen, Richard A. B., 2015, Myrmecophilous Pselaphinae (Coleoptera: Staphylinidae) from New Zealand, The Coleopterists Bulletin 69 (1), pp. 121-152 : 121-152

Neosampa granulata Broun, 1921 ( Figs. 18A , 19 , 20 , 23C )

Redescription. Male. Body length 2.18–2.40 mm, width 0.72–0.80 mm, medium-sized, subparallelsided, color reddish brown ( Fig. 18A ). Head transverse, thick, widest near eyes, narrowed ante- riorly, covered with coarse punctures and short pubescence on dorsal surface; clypeus very short, invisible in dorsal view; frons strongly elevated between antennal bases, flattened anteriorly; vertex flattened, with pair of large and round dorsal tentorial pits between eyes; postgenae large, rounded ( Fig. 19B ). Eyes small, each ovoid, composed of about 20 facets. Antennae very long and slender, 0.58–0.64 mm in length; antennomere I thick, subcylindrical, about as long as II + III; II–VI subequal in width, each subcylindrical; VII–VIII subequal in width, slightly wider than VI; IX–XI successively broadened apicad; XI largest, ovoid, relative length (width) of each antennomere from base to apex to width of antennomere I: 1.6 (1.0); 0.9 (0.8); 1.0 (0.7); 0.8 (0.7); 0.9 (0.7); 0.9 (0.7); 1.0 (0.8); 0.7 (0.8); 1.2 (0.8); 1.1 (1.0); 2.6 (1.2). Maxillary palpi short, elongate; palpomere I very short, broadened distally; II elongate, thickened distally; III short, nearly triangular in ventral view; IV largest, about as long as II + III, nearly fusiform.

Pronotum about as wide as head, about as long as wide, nearly circular, weakly convex, covered with coarse punctures and short pubescence on dorsal surface, with shallow and indistinct median sulcus, pair of short lateral longitudinal sulci, pair of large, deep lateral foveae, and pair of short transverse sulci connecting lateral foveae and median longitudinal sulcus ( Fig. 19A ). Metaventrite very large, weakly convex, densely covered with long pubescence medially ( Fig. 19E ). Elytra about as long as head + pronotum, wider than long, weakly broadened posteriorly, gently flattened on dorsal surface, each elytron sparsely covered with coarse punctures and long pubescence, with 3 basal foveae and 2 longitudinal sulci; outer longitudinal sulcus running from outer basal fovea to near middle ( Fig. 19F ). Legs long, slender; mid-tibia with very short mucro on inner side at apex.

Abdomen about as long as elytra, slightly narrower than elytra, subparallel-sided; segments IV–VII subequal in length in dorsal view; IV transverse, with pair of narrow, subparallel-sided paratergites and large, transverse basimedian concavity; tergite VIII transverse, arcuate on posterior margin; sternite VIII transverse, with large, triangular emargination on posterior margin; tergite IX divided into pair of large, triangular, apically acute sclerites; sternite IX large and lamellar, weakly arcuate on posterior margin ( Fig. 20C ). Male genitalia weakly sclerotized; median lobe bulbous at base, narrowed and bifurcate at apical part; parameres paired, asymmetrical ( Fig. 20D, E ).

Female. Body length 2.10–2.40 mm, width 0.74–0.76 mm, antennal length 1.12–1.16 mm. Similar to male in general aspect but mid-tibiae rounded on inner side at apex, without mucro.

Remarks. This is Broun species number 4039 and was described from four specimens collected by T. Hall from Boulderstone Cleek [sic] and Scarcliff, near Mount Algidus (MC) ( Broun 1921). We selected a lectotype from the syntypical series housed in the NZAC ( Fig. 23C ). The specimen labeled as follows in the BMNH is not a syntype: (4039. ♂ [hw]/ New Zealand [red underline] Broun Coll. Brit. Mus. 1922-482. //Glenhope 23 – 11-1912 [hw]/ Para-Type [round label with blue border] // Neosampa granulata . ♂. [hw].

Distribution. North Island. Wairarapa (WA), Wellington (WN). South Island: Buller (BR), Mid Canterbury (MC).

Host Ant. Prolasius advenus (Formicinae) .

Specimens Examined. Types: Lectotype, female (NZAC): card-mounted (♂, missing left antennomeres 10 and 11), “Boulderstone. 19. 10. 1913. [in Broun’ s hand] // 4039. [in Broun’ s hand] // E. S. Gourley Acc. 1970 Ent. Div. // Probable Broun SYNTYPE Neosampa granulata D S Chandler 2010 [partially handwritten]” ( Fig. 23C ). Paralectotypes (NZAC): 2 card-mounted on same card (♂, male symbols handwritten on card, right specimen mounted dorsally and missing left metatarsus), “Boulderstone Creek. Canterbury. 19. 10. 1913. [handwritten] // Neosampa granulata Broun. 4038. [handwritten] // E. S. Gourley Acc. 1970 Ent. Div. // Probable Broun SYNTYPE Neosampa granulata D S. Chandler 1910 [partially handwritten]”; 1 cardmounted (♂, male symbol written on card, missing right antennomeres IX-XI), “ Neosampa granulata // Scarcliffe 19. 10. 1913. [in Broun’ s hand] // 4039. [in Broun’ s hand] // Broun // Probable Broun SYNTYPE Neosampa granulata D S. Chandler 1910 [partially handwritten]”. Additional specimens examined: WA: 1 female, Upper Manawatu Gorge , 24. x. 1993 [J. T. Nunn]. WN : 1 male, Tararua FP, Makahika Str. [associated with Prolasius advena ], 7. x. 1989 ; 1 male, Pakuratahi Forks ( Under log in forest [associated with Prolasius advena ]), 12. ix. 1993, J. T. Nunn leg. ; 1 female, Upper Manawatu Gorge , 24. x. 1993 [J. T. Nunn] ; 1 male, Opau Rd. (In ants’ nest, associated ant [ Prolasius advena ]), Makara Bush , 4. xii. 1993 [J. T. Nunn] ; 3 males, 1 female, Karori, Johnston Hill ( In ants’ nest, associated ant [ Prolasius advena ]), 5. xii. 1993, J. T. Nunn leg. ; 3 males, Khandallah Domain , 24. xii. 1993, J. T. Nunn leg. ; 1 female, South Kaori Rd. , 13. vii. 1995 [J. T. Nunn] ; 2 females, Rotoiti , 10. Vi. 1910 [J. T. Nunn] ; 1 male, 1 female, Glenhope (from ants nests), 3. iii. 1915, T. Hall leg. ; 1 male, Lake Rotoiti, Nelson, South Is. , 13. vi. 1915, T. Hall leg. ; 2 males, 2 females, same locality as above, 10. iii. 1916, T. Hall leg. ; 1 male, 2 females, Rotoiti , 17. iii. 1916 [collector unknown] ; 2 males, 2 females, Lake Rotoiti , Nelson, 21. iv. 1916, T. Hall leg. BR: 1 female, Truman Track, Punakaiki , 46m (litter and punga 6/83), 9. vi. 1983, H. P. McColl leg ; 4039, New Zealand Broun Coll, Glenhope 23 – 11–1912 [♂ specimen labeled as paratype, BMNH]. MC : 5 males, Rakaia Gorge (in soil occupied by colony of the ant Prolasius advena ), 12. i. 2014, J. Nunn ; 2 females, Rakaia Gorge [associated with Prolasius advena ], 24. xii. 1997 [J. T. Nunn] ; 1 male, Rakaia Gorge , 24. xii. 1997 [J. T. Nunn] ; 2 males, 2 females, Rakaia Gorge (washed soil sample), 320m, NZMS 260 K35/015426, 25. x. 2008 [J. T. Nunn] ; 15 exs. in T. Broun collection, data unknown .

Figures

Fig. 18. Neosampa granulata and Zeasampa nunni, habitus. A) N. granulata, male, B) Z. nunni, male. Scale = 1 mm.

Fig. 19. Neosampa granulata, male. A) Head and prothorax, dorsal view, B) Head and prothorax, ventral view, C) Left antenna, dorsal view, D) Head, anterior view, E) Meso- and metathoraces, ventral view, F) Elytra, dorsal view, G) Abdomen, dorsal view, H) Abdomen, ventral view.

Fig. 20. Neosampa granulata, male. A) Abdominal tergite VIII, B) Sternite VIII, C) Tergite IX (two lateral plates) and sternite IX (middle plate), D) Genitalia, ventral view, E) Genitalia, lateral view. Scale = 0.1 mm.

Fig. 23. Type specimens and their original labels. A) Kenocoelus dimorphus, B) “Dalma” gigantea, C) Neosampa granulata.