Amphimenes carinacaulis, Hunting, Wesley & Yang, Man-Miao, 2019

Hunting, Wesley & Yang, Man-Miao, 2019, A taxonomic review of the pericaline ground-beetles in Taiwan, with descriptions of new species (Coleoptera, Carabidae, Lebiini), ZooKeys 816, pp. 1-164 : 18-20

Amphimenes carinacaulis sp. n. Figs 9, 10 A–D, 11C, 12

Specific epithet.

From Latin carina and caulis, in reference to the strong preapical dorsolateral carina of the male phallus.

Types and other material examined.

Holotype (male) labeled “Holotype” [circular, ringed with red]; "TAIWAN: Yilan Co./Yuanshan Twp. Fushan/ Botanical Garden Area/ 24.7562N, 121.5924E"; "hand collecting, ~640m/ Acc. Ti-211b, April 16, 2014/ D. Hwang & W. M. Hunting"; " NCHU/100952". Eleven paratypes, eight males and four females. For further details see EH Strickland Virtual Entomology Museum Database.

Type locality.

Taiwan. Fushan Botanical Garden, Yilan county.

Diagnosis.

Specimens of this species are distinguished from other Taiwanese Amphimenes by: being macropterous, having a brunneus elytral suture in apical half, and cross striations on disc of elytra.

Description.

OBL 6.50 - 7.83 mm. Length (n = ten males, ten females): head 0.64 - 0.76, pronotum 1.20 - 1.40, elytra 3.42 - 4.50, metepisternum 0.80 - 1.00 mm; width: head 1.12 - 1.36, pronotum 1.64 - 1.92, elytra 2.60 - 3.10, metepisternum 0.46 - 0.60 mm.

Body proportions. HW/HL 1.67 - 1.94; PWM/PL 1.34 - 1.42; EL/EW 1.28 - 1.53; ML/MW 1.50 - 2.08.

Color. Fig. 9. Dorsum of head piceous; clypeus and labrum rufo-brunneous; pronotum nearly piceous with margins rufo-brunneous; proepipleuron rufo-brunneous to brunneous; antennae rufo-brunneous to brunneous; palpi rufo-brunneous; elytral disc nearly piceous, margins rufo-brunneous, translucent; elytral epipleura rufo-brunneous; thoracic sclerites brunneo-piceous; abdominal sterna rufo-brunneous medially and brunneo-piceous at lateral margins; legs with trochanter and femora rufo-testaceous, tibia rufo-brunneous to brunneo-piceous.

Microsculpture. Dorsum of head and pronotum with isodiametric mesh pattern easily visible at 50 × magnification; elytra with transverse sculpticells forming elongate and irregular mesh, faintly visible at 50 × magnification; striae faintly punctate along length.

Macrosculpture. Elytra with cross-striations on intervals, more or less evenly spaced throughout length.

Pilosity. Elytra with scattered micro-punctures, setae visible.

Luster. Elytra moderately glossy to moderately dull; ventral thoracic sterna and abdominal sterna moderately dull.

Head. Labrum with indentation along apical margin, somewhat bilobed; eyes somewhat flattened in appearance, following contour of head.

Pronotum. Lateral margins narrow; posterio-lateral margins obtuse to almost right-angled; basal lobe present.

Elytra. Humeri broadly rounded; lateral margins nearly parallel.

Hind wings. Macropterous.

Legs. Meso-tibia with or without several shallow notches from mid-way to base along ventral surface.

Male genitalia. Fig. 10 A–D. Length 1.32-1.44 mm. Phallus with basal phallic carina (bpc) from base to mid-phallus, decreasing in length from center to right of center when viewed ventrally; left side of shaft moderately enlarged medially, with a strong preapical dorsolateral carina (pdc); endophallus with small internal endophallic sclerite near apex, few distinctive endophallic lobes (el).

Female genitalia. Fig. 11C. Width 0.92-0.96mm. Two spermathecae, spermatheca 1 (sp1) and 2 (sp2) with ducts relatively smooth and even throughout length; one spermathecal accessory gland (sg); spermathecal gland duct (sgd) attachment site on spermatheca 1 duct, proximal to attachment site of spermatheca 2; one small node (sdn), near base of spermatheca 2 duct.

Habitat, habits, and seasonal occurrence.

The known elevational range of A. carinacaulis sp. n. is from 640 to 1850 meters. Adults of this species are found in mixed primary and secondary forest of montane areas. Adults are crepuscular or nocturnal with most activity observed on live tree trunks at night. Specimens have been collected from April to July. All known specimens were hand collected.

Geographical distribution.

Amphimenes carinacaulis is known only from Taiwan. See Figure 12.