Neosampa 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 Broun, 1921

( Figs. 18A , 19 , 20 , 23C )

Neosampa Broun 1921: 518 . Type species: Neosampa granulata Broun, 1921: 518 , by monotypy.

Diagnosis. Body medium-sized (2.18–2.40 mm), robust, subcylindrical ( Fig. 18A ). Head width equal to prothorax and wider than long, frons weakly convex, vertex more or less flattaned with pair of well-demarcated, round dorsal tentorial pits; posterior constriction not notched and lacking lateral fovea; postgenae moderately developed and rounded posteriorly, venter weakly bearded ( Fig. 19B ). Eyes ovoid, visible in dorsal view ( Fig. 19A ). Antennae elongate with antennomere I twice as long as II, with insertions hidden in dorsal view; antennal tubercles weakly defined. Maxillary palpi elongate; palpomere IV largest, nearly fusiform. Pronotum about as wide as long, subglobose, median sulcus complete and weakly impressed, lateral longitudinal sulci well-developed, antebasal sulcus weakly impressed ( Fig. 19A ). Elytra as long as wide, weakly convex, without humeral denticle; each elytron with 3 basal foveae and 2 longitudinal sulci with outer sulcus extending from outer basal fovea to near middle ( Fig. 19F ). Prosternum with median longitudinal carina, lateral carinae absent. Ventral foveae simple, those present as follows: gula (head); lateral metaventral (metaventrite). Legs short and stout; 1 tarsal claw present.

Abdomen about as long as and narrower than elytra, with tergites equal in length ( Fig. 19E ), subrounded posteriorly in both sexes; sternite III very short ( Fig. 19E ). Male genitalia asymmetrical and bulbous ( Fig. 20D, E ).

Remarks. This genus is easily separated from the others in this group by the combination of the following characters: the medium-sized and subparallel-sided body, the robust and transverse head, the very long and slender antennae, the nearly circular pronotum with longitudinal and transverse sulci, and elytra with three basal foveae and two longitudinal sulci.

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.