Trechus torressalai Ortuño and Arillo, 2005

Ortuño, V. M. & Arillo, A., 2005, Description of a new hypogean species of the genus Trechus Clairville, 1806 from eastern Spain and comments on the Trechus martinezi-lineage (Coleoptera: Adephaga: Carabidae), Journal of Natural History 39 (40), pp. 3483-3500 : 3486-3492

publication ID	https://doi.org/ 10.1080/00222930500393046
persistent identifier	https://treatment.plazi.org/id/BC7F87D2-FFFB-FFE8-0087-A8D9FF4EFBB7
treatment provided by	Felipe
scientific name	Trechus torressalai Ortuño and Arillo
status	sp. nov.

Treatment

Trechus torressalai Ortuño and Arillo View in CoL , new species

( Figures 1–5 View Figure 1 View Figure 2 View Figure 3 View Figure 4 View Figure 5 , 7b View Figure 7 , 8a View Figure 8 , 12a View Figure 12 )

Diagnosis

Without developed wings. Microphthalmic, depigmented with microreticulate integument ( Figure 2 View Figure 2 ). Pronotum transverse and slightly cordate: hind angles sharp and sides slightly sinuous in basal margin. Elytra convex, slightly protruding shoulders with eight well-defined striae. Both sexes show similar external morphology, except for the first two segments of anterior tarsus, which are dilated in males. Median lobe of the aedeagus almost straight; long apical lamina curved to the left and sword-shaped ( Figure 3a–d View Figure 3 ); inner piece of median lobe simple. Female genitalia: genital shield with a line of thorn-shape setae on gonosubcoxite; spermatheca sacciform lacking spermathecal gland ( Figures 4 View Figure 4 , 5 View Figure 5 ).

Type series

Holotype: one male with printed data labels, Cueva de la Punta de Benimaquia , Dénia (Alicante, Spain), col. J. Torres Sala. Paratypes: two females, same locality (and printed data) as holotype .

Note. Two specimens (holotype and paratype) are deposited in the collection of Museu Valencià d’Història Natural ( Fundación Entomológica Torres Sala ) and one paratype in the collection of V. M. Ortuño (Department of Animal Biology, Alcalá University, Spain) .

Description

Length. Length of holotype (from tip of mandible to elytron-apex) 6.0 mm ( Figure 1 View Figure 1 ); length of paratypes 5.4–5.9 mm.

Head. Head (to anterior end of clypeus) slightly wider than long; in dorsal view two deep frontal sulci border ocular areas on both sides and fronto-clypeal area towards the centre. Medium-sized eyes, slightly convex. Swollen tempora almost as long as the eyes ( Figures 7b View Figure 7 , 8a View Figure 8 ). Antennae filiform, densely setulose, in particular from 2nd to 11th antennomeres. Mandible prominent, sharp. Labial and maxillary palps as typical in the genus.

Cephalic chaetotaxy ( Figures 1 View Figure 1 , 7b View Figure 7 ). Two pairs of supraocular setae (anterior and posterior); two setae at both sides of clypeus (outer one largest); six setae on labrum, lateral setae more elongate; one seta in the sulcus of each mandible.

Pronotum. Pronotum one-third wider than long, with the sides slightly sinuous in basal third; maximum width in the middle; basal margin rectilinear and smoothly prominent toward the rear angles; basal foveae smooth and deep; hind angles almost right. Disk convex, divided longitudinally by central sulcus branching off towards anterior and posterior angles. Lateral channel of regular width.

Pronotal chaetotaxy ( Figure 1 View Figure 1 ). One anterior seta on each side (almost in the first third) and one posterior seta next to hind angle.

Elytra. Elytra slightly pyriform, approximately three times longer than wide (from the lateral margin until the elytral suture); humeral margin weakly defined, basally oblique.

Disk convex with transverse microsculpture ( Figure 2 View Figure 2 ); eight well-defined striae clearly stippled.

Elytral chaetotaxy ( Figure 1 View Figure 1 ). Marginal umbilical series typical of Trechus (humeral area with four equidistant setae; subapical area with four setae, two anterior and two posterior). Each elytron with one setigerous pore beginning at 2nd stria (scutellar pore), two discal setae in the 3rd stria (anterior seta in anterior fifth and posterior setae in the half), similarly subapical seta present at end of 2nd to 3rd stria, two smaller ones near apical margin. Rudimentary wings.

Legs. Legs long and slender, without special characteristics; foretibia with a longitudinal sulcus; first two tarsal segments of male foreleg dilated.

Aedeagus. Aedeagus 1.4 mm long, with the median lobe almost straight (not arched); long and narrowed apex; apical lamina asymmetrical curved to the left and sword-shaped ( Figure 3a–d View Figure 3 ). Inner sac very simple with a small lamina; there is wrapped up a field of spines in the wall of the praeputial tube ( Figure 3a–d View Figure 3 ). Parameres subsymmetrical (of different lengths), the left heptasetulose and the right pentasetulose in distal extreme ( Figure 3e, f View Figure 3 ).

Female genitalia ( Figures 4 View Figure 4 , 5 View Figure 5 ). External genitalia ( Figure 5 View Figure 5 ) formed by dimerous IX gonopods (gonocoxites and gonosubcoxites) and IX laterotergites. Both gonocoxite are unguiform, with two (or three) thorn-shaped setae of considerable size on its dorsal surface (the largest located near the external edge). Small groove near apex and above ventral surface, with two fine, sensorial setae. Gonocoxite as long as wide, approximately with 10 large, thorn-shaped setae in the internal margin. Wing-shaped, slightly sclerotized IX laterotergite with one group of setae over basal margin (approximately 20) and one more internal group (approximately six). Internal genitalia ( Figure 4 View Figure 4 ) completely membranous; short and large tubular-shaped vagina-bursa ending in spermatheca sacciform with densely folded walls. The spermatheca is located from an oblique way to the sagittal plane. The odd oviduct makes a contact with the spermathecal complex at the base of the spermatheca (on the right side in ventral view), displaying some longitudinal folds; interior densely covered in microfringes.

Variability. Among the only three known specimens distinct morphological variability is not present.

Etymology. The name of the species is after Mr Juan Torres Salas, the great Spanish entomologist, who stored the studied material of Trechus used in this description in his collection.