Eupines (Byraxis) huizhenae, 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 : 39

Eupines (Byraxis) huizhenae sp. nov.

Fig. 24 ; map Fig. 51

Diagnosis: Head with vertexal foveae punctiform; antennae 10-segmented with 2-segmented antennal club; A4, A6, A7, A8 and A10 unmodified, A4 asymmetrical, lateral side strongly extended, A5 largest and somewhat beanshaped, with apex subacute and base acute in lateral view, A9 cylindrical and elongate, about 3.5 × longer than A8, A10 conical, about 1.5 × longer than A9. Abdominal ventrite 2 with pair of flat and wide discal protuberances, inserted with strongly curved large apical setae; ventrite 6 with pair of slender median struts, about half of ventral length. Protrochanters with long ventral spine, about half of protrochanteral width; protibiae and mesotibiae unmodified.

Description: Body length 1.41–1.43 mm; body colour dark brown with lighter coloured elytra and legs. Head as long as wide; frons not narrowed at end, about three-fourths width of head at eye level; eyes moderately developed, slightly prominent in dorsal view, with about 29 facets; vertexal foveae punctiform; antennal tubercles weakly developed; lacking postantennal notches; postantennal cavities long and narrow, slightly shorter than antennal tubercles in dorsal view; antennae 10-segmented with 2-segmented antennal club; A4, A6, A7, A8 and A10 unmodified, A4 asymmetrical, lateral side strongly extended, A5 largest and somewhat bean-shaped, with apex subacute and base acute in lateral view, A9 cylindrical and elongate, about 3.5 × longer than A8, A10 conical, about 1.5 × longer than A9. Pronotum about as long as wide, wider than head at eye level; with punctiform lateral antebasal foveae. Elytra as long as wide, widest at middle; humeral calli indistinctive, slightly prominent in dorsal view; sutural stria barely visible from base to middle, shallowly extending from middle to apex. Abdomen with tergite 1 about twice length of tergite 2; ventrite 2 with pair of flat and wide discal protuberances, inserted with strongly curved large apical setae; ventrite 6 with pair of slender median struts, about half of ventral length. Legs with protrochanters modified with long ventral spine, about half of protrochanteral width; protibiae and mesotibiae unmodified. Aedeagus about 0.28 mm long, with long and sinuate parameres, bent downwards in lateral view, apex curved towards each other, with pair of long subapical setae; median lobe with two large sclerites, base nearly meet, strongly curved from middle and entwined apically.

Comments: This species is most similar to E. (B.) minuta and E. (B.) ovalis by their similar antennal modifications but can be differentiated from both by having its protrochanters modified with long ventral spine that is otherwise barely visible ( Figs. 33D ; 39E ).

Distribution: South Island. KA.

Etymology: This species is named after HuiZhen Yu, the first author’s mother, for her unending support.

Type material ( NZAC): Holotype. ♂, specimen entire, card-mounted: “ NEW ZEALAND, KA, Mt. Fyffe Hut , 17 Jan 2002, R. Leschen, L. Dunning, under rock, 42°19.437'S, 173°35.573'E, 1105m ”. Paratypes . 1 ex.: KA: Oaro , 15–22/Mar/1980, J.W. Early, Malaise trap .

Figures

FIGURE 24. Diagnostic characters of E. (B.) huizhenae 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 33. Diagnostic characters of E. (B.) minuta sp. n. A) Habitus. B) Antenna, in dorsal view. C) Same, in lateral view. D) Protrochanter. E) Mesotibia. 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 39. Diagnostic characters of E. (B.) ovalis sp. n. A) Habitus. B) Antenna, in dorsal view. C) Same, in lateral view. D) Same, in ventral view. E) Protrochanter. F) Abdomen, in ventral view. 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 51. Geographic distributions of E. (B.) glabrata (Broun, 1886), E. (B.) graceae sp. n., E. (B.) halli (Broun, 1921), E. (B.) hectori (Broun, 1895), E. (B.) hoarei sp. n., E. (B.) huizhenae sp. n., and E. (B.) illustris (Broun, 1914) in New Zealand.