Tonkinaphaenops jingxicus Huang & Tian, 2019

Huang, Sunbin, Tú, Výõng Tân, Phú, Ph ạm Văn, Tian, Mingyi & Faille, Arnaud, 2019, Contributions to the knowledge of the genus Tonkinaphaenops Deuve, 2013 from China and Vietnam (Coleoptera: Carabidae: Trechinae), Zootaxa 4701 (1), pp. 35-53 : 42-48

Tonkinaphaenops jingxicus Huang & Tian , sp. nov.

( Figs. 1 , 9– 10 , 14E )

Holotype. ♀; China: Guangxi: Jingxi: Ludong: Biaoliang : cave Nianluo Dong ; 23°10’5.35”N 106°16’13.98”E, 927 m; coll. Sunbin Huang, Dianmei Wang, Mengzhen Chen, Ruiqi Han; 1 February 2018; SCAU.

Description. Length: 6.2 mm (from apical margin of labrum to elytral apex), 6.6 mm (including mandibles); width: 2.1 mm. Habitus as in Fig. 9 .

Similar to T. marinae and T. yinquanicus . Fore body long and narrow, hind body elongated obovate, strongly convex on dorsum; concolourously reddish-brown, but antennae, palps and tarsi slightly lighter at the apical part; pronotum glabrous on its dorsal surface, sparsely pubescent on the head and widely pubescent on elytra.

Head (without mandibles) as long as wide, HLm/HW = 1.6, HLl/HW = 1.0; frontal furrows deep and long, subparallel-sided at the anterior half, gradually curved at the posterior half, effaced near neck constriction; clypeus quadrisetose, without additional setae; right mandible bidentate; eyes absent, two pairs of supraorbital pores present; mentum bisetose, base widely concave, mental tooth very short and blunt; lateral lobe sharp and pointed at apex; labial suture indistinct; submentum 6-setose; ligula broadened at apex, multi-setose; labial palpomere 2 about 1.3 times longer than palpomere 3, bisetose on inner margin, with two additional setae on outer side at subapical and apical portions, maxillary palpomere 3 as long as 4; antennae extending to about the middle of elytra; scape with several setae; the 2 nd– 11 th antennomeres pubescent; the 2 nd antennomere a little longer than scape; the 4 th antennomere the longest, other antennomeres gradually decreasing in length posteriorly until the 10 th which is shorter than the 11 th.

Pronotum longer than wide, PW/PL = 0.8, wider than head, PW/HW = 1.2, base as wide as front, PbW/PfW = 1.0; lateral margins bordered throughout, thick and a little widened in the middle part; two pairs of marginal setae present, at the level of 1/5 from front and a little before hind angle respectively.

Elytra slightly more oviform-shaped, longer than wide, EL/EW = 1.7, widest at about the level of 1/3 from base, much longer than pronotum, EL/PL = 2.5, wider than pronotum, EW/PW = 1.9; chaetotaxy as in Fig. 14E : basal pores present at the beginning of the 2 nd stria; 4 dorsal setiferous pores present in 3 rd stria; the first umbilicate pore shifted to level of the 7 th stria and a little before the 2 nd pore; the 3 rd pore of marginal umbilicate series much closer to 2 nd than to 4 th, making distance between 3 rd and 4 th twice as that between 2 nd and 3 rd; the middle group at about the 3/5 of elytra from base; two apical pores present.

Male. Unknown.

Etymology. The species epithet is an adjective referring to the type locality.

Remarks. This new species is close to T. yinquanicus , but differs in elytra with shoulders less developed, and the 3 rd pore of marginal umbilicate series much closer to 2 nd than to 4 th.

Distribution. Guangxi (Jingxi), China ( Fig. 1 ).

Known so far only from a limestone cave called Nianluo Dong, at Biaoliang Cun, Ludong Zhen. Nianluo Dong is 31.4 km and 45.9 km from the type localities of T. yinquanicus and T. marinae respectively. The cave is located at the middle of a hill, with a small and unnoticeable entrance. The trechine beetles were found and collected in a large chamber which was wet and muddy ( Fig. 10C ).

Figures

FIGURE 1. Distribution map of Tonkinaphaenops Deuve, 2013

FIGURE 9. Tonkinaphaenops jingxicus sp. nov., habitus of holotype, female.

FIGURE 10. Cave Nianluo Dong, type locality of Tonkinaphaenops jingxicus sp. nov. (A. red arrow showing the location of entrance; B. entrance; C. a running individual of Tonkinaphaenops jingxicus).

FIGURE 14. Chaetotaxal pattern of Tonkinaphaenops (A. Tonkinaphaenops marinae Deuve, 2013, holotype, male from cave TH20; B, C. Tonkinaphaenops yinquanicus sp. nov.: B. male from Yinquan Dong, C. female from Yinquan Dong; D. Tonkinaphaenops impunctatus sp. nov., male from Hang Rắn cave; E. Tonkinaphaenops jingxicus sp. nov., female from Nianluo Dong; F. Tonkinaphaenops anthonyi sp. nov., male from Hang Dõi cave).