Dongodytes (Dongodytodes) inexpectatus, Tian, Mingyi, Yin, Haomin & Huang, Sunbin, 2014

Tian, Mingyi, Yin, Haomin & Huang, Sunbin, 2014, Du'an Karst of Guangxi: a kingdom of the cavernicolous genus Dongodytes Deuve (Coleoptera, Carabidae, Trechinae), ZooKeys 454, pp. 69-107 : 83

Taxon classification Animalia Coleoptera Carabidae

Dongodytes (Dongodytodes) inexpectatus sp. n. Figs 1e, 12, 22, 41-42, 66-69, 73h

Description.

Length: 6.2-7.0 (mean 6.6 mm); width: 1.6-2.0 mm (mean 1.83 mm). Habitus as in Fig. 12.

Colour: Light dark brown, palps pale.

Macrosculpture: Head and pronotum smooth, elytra vaguely punctate, body moderately shiny and wholly pubescent.

Microsculpture: Densely and more or less transversely striate on head and pronotum, faint on elytra.

Head rather elongate (Fig. 22), less stout than in Dongodytes jinzhuensis sp. n., distinctly longer than wide, HL/HW=2.7-2.9 (mean 2.8); widest at about middle from labrum, head excluding mandibles distinctly longer than pronotum (1.4-1.9 times, mean 1.6); head (including mandibles) plus prothorax as long as elytra; genae distinctly expanded posteriorly though less so than in Dongodytes jinzhuensis sp. n., collar-shaped neck distinct, head about 2.3 times wider than collar-shaped neck, suddenly constricted before collar-shaped neck; almost parallel-sided in median part; two pairs of supraorbital setae present, anterior ones slightly longer than the posterior which are distinctly longer than pubescent setae and easily recognized; clypeus 10-setose; a pair of suborbital setae present, close to neck constriction; labial suture well developed; mentum quadrisetose, setae at base and median parts respectively, basal pits distinct, mental tooth simple; submentum octosetose; ligula 12-setose apically; palps slender, 4th maxillary palpomere slightly longer than 3rd, 2nd labial palpomere much longer than 3rd, bisetose on inner margin; antennae extending at about apical 1/6 of elytra, 1st antennomere distinctly longer than 2nd, which is the shortest, 3rd the longest, over twice as long as 2nd, gradually shortened from 4th until 10th, 11th as long as 8th and distinctly longer than 10th.

Prothorax much longer than wide though propleura distinctly tumid, widest at about 1/3 from base; pronotum narrower than head, PW/HW=0.9, and than prothorax, PW/PTW=0.7-0.8 (mean 0.8); front narrower than base, PAW/PBW=0.7-0.8 (mean 0.8); lateral borders almost parallel-sided in frontal half, then feebly expanded at about basal 1/3, distinctly sinuate before hind angles; front angles right, hind angles broadly obtuse; only basal pair of latero-marginal setae present, close to hind angles.

Elytra moderately elongate, much wider than prothorax, EW/PTW=1.5-2.0 (mean 1.8); much longer than wide, EL/EW=1.8-2.0 (mean 1.9); widest at about apical 1/3, lateral sides near base not well marked, and nearly straight; striae well marked, only preapical dorsal pore present, at about apical 1/6 of elytra; chaetotaxy similar in Dongodytes deharvengi .

Male genitalia (Figs 41-42): Median lobe of aedeagus much shorter than in Dongodytes deharvengi , widely and strongly arcuate, sagittal aileron moderately sized but very distinct, apex slender in profile; inner sac armed with a long and rather narrower copulatory piece about 2/5 as long as the median lobe; in dorsal view, apical lobe moderately in width, roundly truncate at apex, not parallel-sided at subapical part; right paramere thin at apex, with two long apical setae, left paramere stout, triangular, with four long setae at subapex and apex.

Etymology.

The name of this new species indicates that it was really a surprise for us to collect the type material in a cave which is very close to caves Jinzhu Dong I and Jinzhu Dong II (about 2 km only), the type localities of Dongodytes jinzhuensis sp. n.

Remarks.

Dongodytes inexpectatus sp. n. is similar to Dongodytes brevipenis sp. n., but it is easily distinguished from the latter by its stouter head and pronotum, and lateral sides of elytra distinctly sinuate against 1st and 2nd umbilicate pores (indistinctly sinuate in Dongodytes brevipenis ). Compared to Dongodytes jinzhuensis sp. n., Dongodytes inexpectatus sp. n. is much slender and smaller, head much less expanded, clypeus 10-setose (sexsetose in Dongodytes jinzhuensis ), and only posterior pair of latero-marginal setae present on pronotum (two pairs present in Dongodytes jinzhuensis ).

Material examined.

Holotype: male, Guangxi: Du’an: Gaoling: Nongchi: cave Nongguangshang Dong II, 24° 05.4263N, 108° 04.5726E, 175 m, 2013-XII-27, leg. Mingyi Tian, Weixin Liu, Haomin Yin & Xiaozhu Luo, in SCAU; Paratypes: 2 females, ibid, in SCAU.

Distribution.

Guangxi ( Du’an). Known only from the limestone cave called Nongguanshang Dong II in Gaoling (Figs 1e and 73h).

The entrance of Nongguanshang Dong II (Figs 66-69) is in a corn field. Along the artificial steps it is easy to entre. It is a small cave, with a pool at about 30 m from the entrance which is water source of the local people. On the right of the pool, there is a gallery partially covered by water. The length of Nongguanshang Dong II is unknown and we surveyed up to about 100 m. The beetles were discovered on the ground and the wall in a small area on the gallery’s right side. Other cave animals found in the cave are crickets, spiders, isopods, shrimps, millipedes and snails.