Sagola furcata, Broun, 1921

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 : 90-91

22. furcata species-group

(6 species)

Diagnosis. Members of the furcata speciesgroup can be distinguished from other Sagola species-groups by the following combination of characters: body small, length 1.8–2.2 mm; frontal sulcus inverted Y- or V-shaped, divided with each posterior end meeting vertexal fovea ( Fig. 52o, q ); ventral surface of male head with inverted triangular process bearing dense setae behind mouthparts ( Fig. 52p, r ); hind wings fully developed; abdominal tergites IV–VI with discal carinae; male abdominal ventrites V–VI weakly depressed or flattened medially and bearing dense setae; only known from South Island ( Fig. 53 ).

KEY TO SPECIES OF THE FURCATA SPECIES- GROUP

The key is based on male specimens because most female specimens are indistinguishable based on external morphology.

1. Frontal sulcus inverted V-shaped ( Fig. 52q ); eye large, as long as temple ( Fig. 52q ); antennomeres 4–5 subquadrate..............2

1′. Frontal sulcus inverted Y-shaped ( Fig. 52o ); eye small, approximately one-third length of temple ( Fig. 52o ); antennomeres 4–5 longer than wide ..................................................... 3

2(1). Apical lobe of genitalia with V-shaped depression ( Fig. 52k )...... S. ignota Broun

2′. Apical lobe of genitalia blunt apically ( Fig. 52l–m )..... S. lewisensis new species

3(1′). Median lobe of genitalia at least 3 times broader than paramere ( Fig. 52g ) ............. ...................................... S. furcata Broun

3′. Median lobe of genitalia as wide as paramere................................................4

4(3′). Median lobe of genitalia twisted ( Fig. 52h ) .............................. S. punctulata Raffray

4′. Median lobe of genitalia curved vertically .................................................................5

5(4′). Only apical part of median lobe of genitalia hook-shaped ( Fig. 52i )......................... ................................ S. pecki new species

5′. Entire lobe of median lobe of genitalia hook-shaped ( Fig. 52j ) .............................. ............................. S. muirae new species

Figures

Fig. 52. Sagola species in the furcata species-group. Habitus, dorsal views: a) S. furcata, b) S. punctulata, c) S. pecki, d) S. muirae, e) S. ignota, f) S. lewisensis. Aedeagi, dorsal views: g) S. furcata, h) S. punctulata, i) S. pecki, j) S. muirae, k) S. ignota, l) S. lewisensis. m) S. lewisensis, aedeagus, lateral view, n) S. ignota, antenna. S. punctulata, male head: o) Dorsal surface (arrow indicates inverted Y-shaped frontal sulcus), p) Ventral surface. S. ignota, male head: q) Dorsal surface (arrow indicates inverted V-shaped frontal sulcus), r) Ventral surface. Scale bars a–f = 1 mm, g–r = 0.1 mm.

Fig. 53. Known collection localities of New Zealand Sagola species. S. furcata: black circles; S. punctulata: triangles; S. pecki: black square; S. muirae: stars; S. ignota: white circles; S. lewisensis: white squares.