Eupines (Byraxis) dugdalei, 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 : 27-29

Eupines (Byraxis) dugdalei sp. nov.

Fig.16 ; map Fig. 50

Diagnosis: Head lacking vertexal foveae; antennae 10-segmented with 2-segmented antennal club; A4, A6, A7, A8 and A10 unmodified, A5 conspicuously enlarged, more than twice length of A4, A9 asymmetrical and largest, about 1.5 × longer than A10, base strongly narrowed, widest at middle, A10 conical. Abdominal ventrite 2 with pair of large discal protuberances, inserted with strongly curved small apical setae; ventrite 6 with pair of slender median struts, about three-fifths of ventral length. Protrochanters with long and acute ventral spine, about two-thirds of protrochanteral width; protibiae with large apical protuberance; mesotibiae unmodified.

Description: Body length 1.45–1.55 mm; body colour dark brown to black with lighter coloured tarsi. Head wider than long; frons slightly narrowed at end, about half width of head at eye level; eyes moderately developed, with about 24 facets; lacking vertexal foveae; antennal tubercles barely visible; lacking postantennal notches; postantennal cavities large, about 1.3 × length of antennal tubercles in dorsal view; antennae 10-segmented with 2-segmented antennal club; A4, A6, A7, A8 and A10 unmodified, A5 conspicuously enlarged, more than twice length of A4, A9 asymmetrical and largest, about 1.5 × longer than A10, base strongly narrowed, widest at middle, A10 conical. Pronotum slightly wider than long, wider than head at eye level; lacking lateral antebasal foveae. Elytra slightly longer than wide, widest at apical three-fifths; humeral calli barely visible; sutural stria shallowly extending from base to apex. Abdomen with tergite 1 about as long as tergite 2; ventrite 2 with pair of large discal protuberances, inserted with strongly curved small apical setae; ventrite 6 with pair of slender median struts, about threefifths of ventral length. Legs with protrochanters modified with long and acute ventral spine, about two-thirds of protrochanteral width; protibiae with large apical protuberance; mesotibiae unmodified. Aedeagus about 0.33 mm long, with long and large parameres, widest near apex, bent downwards in lateral view, with pair of subapical setae; median lobe with two small sclerites curved towards each other at apex, much smaller than parameres.

Comments: This species is similar to E. (B.) impar by having A9 enlarged but can be separated by its modified protibiae ( Fig. 16E ) (it is unmodified in E. (B.) impar ).

Distribution: South Island. OL, FD, SL.

Etymology: This species is named after the collector of the holotype, John Dugdale.

Type material ( NZAC): Holotype. ♂, specimen entire, point-mounted: “ NEW ZEALAND, OL, Headlong Pk., 1524 m, South Basin , 20 Feb 1980, J.S. Dugdale // Litter 80/26”. Paratypes . 11 ex.: OL: 5, same data as holotype; FD: 1, Middle Basin , Tutoko Bench , Darran Mts. 13/Jan/1977 // J.S. Dugdale; 1, Middle Basin , Tutoko Bench , Darran Mts., 1524 m // 14/Jan/1977, J.S. Dugdale; 1, Secretary I., Mt. Grono, 29/May/1982, T. Haslam // Mat plants 82/67; SL: 3, 1 km S. Longwood Trig, 700 m, Longwood Ra., 01/Feb/1976 // L.L. Deitz Mats, 76/12 .

Figures

FIGURE 16. Diagnostic characters of E. (B.) dugdalei sp. n. A) Habitus. B) Antenna, in dorsal view. C) Same, in lateral view. D) Protrochanter. E) Protibia. 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 50. Geographic distributions of E. (B.) crassicornides Newton, 2017, E. (B.) decens (Broun, 1893), E. (B.) dispar (Sharp, 1874), E. (B.) dugdalei sp. n., E. (B.) fraudulenta (Broun, 1886) and E. (B.) gigas sp. n. in New Zealand.