Eccoptolonthus fuyuensis Fei & Zhou, 2021

Fei, Xu-Dong & Zhou, Hong-Zhang, 2021, Revision of Eccoptolonthus Bernhauer (Coleoptera: Staphylininae: Philonthina) with descriptions of four new species from China, Zootaxa 4949 (3), pp. 473-498 : 485-487

5. Eccoptolonthus fuyuensis Fei & Zhou , sp. nov.

( Figs. 7A–G , 8A–F )

Type materials. Holotype. ♂, China: Zhejiang: Linan: Tianmu mountain (30º2006′ N, 119º2654′ E), 400 m, 28.VI.2009, collected by Wu Jie ( IZ-CAS).

Description. Length: BL= 7.19 mm (HPL= 2.21 mm). Length of different body parts: HW= 1.15 mm, HL= 0.95 mm (HW= HL= 1.25); ELL= 0.22 mm, TL= 0.17 mm; PL= 1.26 mm, PW= 1.16 mm (PW: HW= 1.10); EL= 1.66 mm, EW= 1.60 mm; AW= 1.50 mm.

Head black with slightly iridescent lustre. Pronotum dark reddish-brown. Antennae with antennomere I dark brown, apical-half of antennomere II–III dark brown, basal-half of antennomere II–III black, antennomere IV–V dark brown; due to damage, characters of apical segments unknown. Elytra black with suture and posterior margin markedly reddish-brown. Scutellum dark reddish-brown. Abdomen black with strongly iridescent lustre, posterior margin of each tergite narrowly reddish-brown. Mandibles and labrum reddish-brown, III, IV segments of maxillary and labial palpi yellowish-brown, base part of maxillary palpi reddish-brown. Profemur and mesofemur yellowishbrown, metafemur dark reddish-brown, tarsomere I dark brown, tarsi II–IV yellowish-brown, tarsi V yellow.

Head of subquadrate shape, subparallel-sided, obtusely rounded at basal angles, slightly wider than long. Tempora almost evenly rounded, moderately and coarsely punctate; eyes large slightly convex, about 1.29 times as long as tempora. Dorsal surface of head with moderately numerous, large setiferous punctures, becoming sparser toward vertex; vertex largely impunctate. Entire head with distinct and dense microsculpture of transverse waves. Antennae long, antennomere I about two times as long as antennomere III, distinctly thickened towards apex, antennomere III about 1.25 times as long as antennomere II, following antennomeres gradually decreasing in length, but antennomere IV–V distinctly longer than wide; due to damage, characteristics of other antennomeres unknown.

Pronotum approximate rectangular, slightly convex, posterior angles markedly rounded, pronotum almost as wide as head, parallel-sided; punctation moderate and fine, punctures separated by three to five times their diameter, narrowly impunctate along midline, the punctures approximately equal in size, microsculpture similar to that on head.

Elytra about 1.3 times as along as pronotum, about 1.37 times as wide as pronotum; scutellum large, triangular; elytra and scutellum densely and finely punctate, punctures separated by one to two times their diameter, punctures much finer than those on head and pronotum.

Abdomen wide, narrowing towards apex, densely and finely punctate, punctures separated by two to three times their diameter; tergites III–V with two basal lines, elevated area between basal lines more sparsely punctate; punctation of basal portion of all tergites coarser than that on elytra, becoming sparser towards posterior margin of each tergite. Surface between punctures without microsculpture.

Male: Sternite VIII moderately wide, approximate trapezoid, with obtusely triangular medioapical emargination ( Figs. 7F , 8E ). Genital segment with stylus of tergite IX simple, densely setae apically, and bearing two longer and stronger setae in the middle of tergite IX ( Figs. 7G , 8F ). Sternite IX with asymmetrical basal portion, apex deeply emarginate, with rod-like extensions ( Figs. 7D , 8C ). Tergite X approximately trapezoid with slightly triangular emargination ( Figs. 7E , 8D ).

Aedeagus in ventral view with median lobe almost as wide as paramere, slightly expanded in the middle and narrowed into truncate apex, middle part of paramere narrowed, apex of paramere approximately circular, with dense peg setae irregularly arranged along apical portion of paramere ( Figs. 7B , 8A ); in lateral view, apical portion moderately bent ventrally, paramere elongate, apical-half of paramere ellipsoidal, some fine setae on apex. ( Figs.7C , 8B ).

Remarks. Eccoptolonthus fuyuensis Fei & Zhou sp. nov. is most similar to Eccoptolonthus rutiliventris ( Sharp, 1874) but can be easily distinguished by the sensory peg setae of paramere uniformly distributed at the apex of paramere; in lateral view, the length of sensory peg setae about 0.25 times as long as width of the paramere (obviously shorter in Eccoptolonthus rutilivenris ( Sharp, 1874)) ; in ventral view, paramere distinctly constricted at middle, this point about 0.36 times as broad as median lobe of aedeagus. Eccoptolonthus fuyuensis Fei & Zhou sp. nov. can be easily distinguished from Eccoptolonthus gastralis ( Sharp, 1874) by the following characters: male sternite VIII of Eccoptolonthus fuyuensis Fei & Zhou sp. nov. with a pair of long appendages, ( Eccoptolonthus gastralis ( Sharp, 1874) without); in ventral view, paramere distinctly constricted at middle.

Etymology. The specific epithet refers to the name of the type locality, Fuyu Mountain (Tianmu Mountain was named as Fuyu Mountain in ancient times).

Distribution. This species is at present known only from the type locality.

Figures

FIGURE 7. Eccoptolonthus fuyuensis Fei & Zhou, sp. nov. A. Habitus; B. aedeagus, dorsal (parameral side) view; C. aedeagus, lateral view; D. sternite IX of male; E. tergite X of male; F. sternite VIII of male; g. stylus of tergite IX of male. Scale bars, A, B, C, D, E, F, G, H= 0.2 mm;

FIGURE 8. Eccoptolonthus fuyuensis Fei & Zhou, sp. nov. A. aedeagus, dorsal (parameral side) view; B. aedeagus, lateral view; C. sternite IX of male; D. tergite X of male; E. sternite VIII of male; F. stylus of tergite IX of male. Scale bars, A, B= 0.1 mm; C, D= 0.13 mm; E, F= 0.18 mm.