Eupines (Byraxis) mayae, Shen & Leschen, 2020

Shen, Jia-Wei & Leschen, Richard A. B., 2020, Revision of Eupines King of New Zealand (Coleoptera: Staphylinidae: Pselaphinae: Goniaceritae), Zootaxa 4777 (1), pp. 1-84 : 49-50

Eupines (Byraxis) mayae sp. nov.

Fig. 31 ; map Fig. 52

Diagnosis: Head with vertexal foveae punctiform; antennae 10-segmented with 2-segmented antennal club; A4, A5, A6, A7, A8 and A10 unmodified, A9 asymmetrical and enlarged, slightly shorter than A10, with ventromedial excavation and minute protuberance at lateral side, A10 largest and conical. Abdominal ventrite 2 with pair of large discal protuberances close to each other, inserted with slightly curved medium-sized apical setae; ventrite 6 with pair of long and acute median struts, about one-third of ventral length. Protrochanters with short ventral spine, about two-fifths of protrochanteral width; protibiae and mesotibiae unmodified.

Description: Body length 1.34–1.40 mm; body colour reddish brown to dark brown with lighter coloured elytra and legs. Head wider than long; frons not narrowed at end, about three-fourths width of head at eye level; eyes well developed and prominent in dorsal view, with about 34 facets; antennal tubercles moderately developed; postantennal notches broad and distinctive; vertexal foveae punctiform; postantennal cavities large, slightly shorter than antennal tubercles in dorsal view; antennae 10-segmented with 2-segmented antennal club; A4, A5, A6, A7, A8 and A10 unmodified, A9 asymmetrical and enlarged, slightly shorter than A10, with ventromedial excavation and minute protuberance at lateral side, A10 largest and conical. Pronotum slightly wider than long, as wide as head at eye level; lacking lateral antebasal foveae. Elytra slightly longer than wide, widest near middle; humeral calli slightly prominent in dorsal view; sutural stria weak, shallowly extending from base to apex. Abdomen with tergite 1 about 1.2 × longer than tergite 2; ventrite 2 with pair of large discal protuberances close to each other, inserted with slightly curved medium-sized apical setae; ventrite 6 with pair of long and acute median struts, about one-third of ventral length. Legs with protrochanters modified with short ventral spine, about two-fifths of protrochanteral width; protibiae and mesotibiae unmodified. Aedeagus about 0.37 mm long, with long and stout parameres, curved towards each other at apex and bent downwards in lateral view, with three pairs of short subapical setae; median lobe with two slender sclerites, curved towards each other at apex, shorter and much narrower than parameres.

Comments: This species can be distinguished from all other Eupines by its simple antennal modifications and ventrite 2 with pair of large discal protuberances close to each other ( Figs. 31 B–D, 31F).

Distribution: North Island. ND.

Etymology: This species is named after the collector of the holotype, V. A. May

Type material ( NZAC): Holotype. ♂, specimen entire, card-mounted: “ NEW ZEALAND, ND, Mangamuka Smt., 386m, 13 Dec 1976, V.A. May Litter 76/109”. Paratypes . 1 ex.: Unknown locality: T. Broun Collection // A.E. Brookes Collection.

Figures

FIGURE 31. Diagnostic characters of E. (B.) mayae sp. n. A) Habitus. B) Antenna, in dorsal view. C) Same, in lateral view. D) Same, in ventral view. E) Protrochanter. F) Ventrite 2. G) Ventrite 6. H) Aedeagus, in dorsal view. I) Same, in lateral view. J) Same, in ventral view. Scale bars: A = 1 mm, B–F = 0.2 mm, G–J = 0.1 mm.

FIGURE 52. Geographic distributions of E. (B.) impar (Sharp, 1874), E. (B.) impressifrons (Broun, 1880), E. (B.) insolita sp. n., E. (B.) lewisi Broun, 1910, E. (B.) longiceps Raffray, 1904, E. (B.) mayae sp. n., and E. (B.) micans (Sharp, 1874) in New Zealand.