Eupines (Byraxis) carinata, 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 : 16-17

Eupines (Byraxis) carinata sp. nov.

Fig. 8 ; map Fig. 49

Diagnosis: Head with vertexal foveae punctiform; antennae 10-segmented with 2-segmented antennal club; A4, A5, A6, A7 and A8 unmodified, A9 greatly elongated, about five-sixths length of A10, lateral side with two deep striae extending from base to near middle, apical margin slightly wavy, A10 largest and generally conical, lateral side with three narrow carinae splitting one large basal impression and two small anterolateral impressions. Abdominal ventrite 2 with pair of barely visible discal protuberances, inserted with slightly curved large apical setae; ventrite 6 with pair of long and acute median struts, curved towards each other at apex, about half of ventral length. Protrochanters with long and acute ventral spine, about twice of protrochanteral width; protibiae and mesotibiae unmodified.

Description: Body length 1.88–1.99 mm; body colour reddish brown to dark brown with lighter coloured elytra and legs. Head slightly wider than long; frons slightly narrowed at end, about half width of head at eye level; eyes well developed, conspicuously prominent in dorsal view, with about 33 facets; vertexal foveae punctiform; antennal tubercles weakly developed; postantennal notches shallow; postantennal cavities long and narrow, about two-thirds length of antennal tubercles in dorsal view; antennae 10-segmented with 2-segmented antennal club; A4, A5, A6, A7 and A8 unmodified, A9 greatly elongated and about five-sixths length of A10, lateral side with two deep striae extending from base to near middle, apical margin slightly wavy, A10 largest and generally conical, lateral side with three narrow carinae splitting one large basal impression and two small anterolateral impressions. Pronotum about as long as wide, slightly wider than head at eye level; with punctiform lateral antebasal foveae. Elytra slightly longer than wide, widest near apical two-thirds; humeral distinctive in dorsal view; sutural stria distinctively extending from base to apex. Abdomen with tergite 1 about twice length of tergite 2; ventrite 2 with pair of barely visible discal protuberances, inserted with slightly curved large apical setae; ventrite 6 with pair of long and acute median struts, curved towards each other at apex, about half of ventral length. Legs with protrochanters modified with long and acute ventral spine, about twice of protrochanteral width; protibiae and mesotibiae unmodified. Aedeagus about 0.38 mm long, with long and straight parameres, widest near middle, with pair of long apical setae; median lobe with single large and horn-shaped sclerite, average width narrower than parameres.

Comments: This species has the largest ratio of ventral spine/protrochanteral widths ( Fig. 8E ) among all known Eupines in New Zealand. Distribution: North Island. BP, WN. Etymology: This specific epithet refers to the carina on the last antennomere of this species. Type material: Holotype. ♂, JNPC, specimen entire, card-mounted: “ NEW ZEALAND, WN, Waikawa Beach , 18 Mar 1990 // J.T. Nunn collection” . Paratypes. 1 ex.: BP: 1, Waimana Valley , 20/Feb/1927 // A.E Brookes Collection .

Figures

FIGURE 8. Diagnostic characters of E. (B.) carinata 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 49. Geographic distributions of E. (B.) anisarthra (Broun, 1914), E. (B.) bisulcifrons (Broun, 1914), E. (B.) brevis sp. n., E. (B.) caesta sp. n., E. (B.) carinata sp. n., E. (B.) coalita sp. n., E. (B.) complector sp. n. and E. (B.) conspicua (Broun, 1893) in New Zealand.