Hyleoglomeris nigromaculata Likhitrakarn, 2024

Hyleoglomeris nigromaculata Likhitrakarn View in CoL ,

Sutcharit & Panha, sp. n.

Figs. 5, 6

Holotype ♂ ( CUMZ-GLO019 ), Thailand, Suphan Buri Province, Dan Chang District, Tham Weruwan Cave , outside cave area, elev. ca. 120 m a.m.s.l., 14°57’18“N, 99°38’59”E, 8/5/2020, leg. P. Jirapatrasilp and R. Srisonchai. GoogleMaps

Paratypes. 12 ♂♂, 10 ♀♀ ( CUMZ-GLO019 ) , 1 ♂, 4 ♀♀ ( MUC-GLO019 ), same locality, together with holotype .

Name. To emphasize the dark spots on the dorsum, adjective in feminine gender.

Diagnosis. Its colour pattern is similar to that of Hyleoglomeris maculata Golovatch, 2006 , from Yunnan Province, China, in which terga 3–11 show two contrasting pairs of dark paramedian circles at the median margin and a small dark circle on the lateral sides (fig. 5A, C). Yet it differs by the collum and pygidium showing a contrasting pair of dark spots against a yellowish background (fig. 5A–C) (vs absent), a pair of dark spots, both large and reaching translucent caudal and lateral margins (fig. 5A–C) (vs small and reaching neither the caudal nor lateral edges), coupled with a tongue-shaped, large, rounded, central lobe of the telopod syncoxite, which surpasses the height of both syncoxite horns (sh) (fig. 6D, E) (vs smaller and not surpassing the height of the syncoxite horns).

Description. Body length of unrolled holotype, 7.2 mm, width 4.1 mm. Body length of unrolled paratypes, 5.4–7.3 mm (♂), 5.6– 8.2 mm (♀), width 3.4–4.3 (♂), 3.4–4.4 mm (♀).

Colour faded after three years of preservation in alcohol (fig. 5A–C): Body yellowish to yellow-orange, with a pair of rather large, dark brown, paramedian spots flanking the midline on each of terga 4–11; lateral sides of terga 3–11 also with a pair of small, sublateral, brown to light brownish spots, these reaching neither caudal not lateral edges (fig. 5A, C); collum and pygidium with a pair of large, lateral, dark brown spots reaching translucent caudal and lateral margins (fig. 5A–C); head and collum brown to dark brownish, only labrum and Tömösváry’s organs light brown; legs and venter yellow-brown to light yellowish, with claw and posterior part of each tarsus whitish (fig. 5B).

Labrum sparsely setose (fig. 5B). Gnathochilarium with 2 + 2 palps of equal length. Eyes blackish, with 7–8(9)+1 ommatidia, cornea convex and translucent. Antennae with four evident apical cones, antennomere 6 approximately 1.9–2.3 times as long as its height (fig. 5B). Tömösváry’s organ typical, horseshoe-shaped, oblong-oval, elongate, approximately 1.4–2.2 times as long as broad (fig. 5B).

Collum normal, with two transverse striae. Thoracic shield with a small hyposchism field not projecting behind tergal margin (fig. 5C). Striae 5–8, mostly superficial, only lower 1–2 lying above schism, one level to schism, remaining 3–5 below schism, 4–5 complete, crossing the dorsum. Terga 3 and 4 broadly rounded laterally (fig. 5C). Following terga in front of pygidium concave medially at caudal edge and with two or three striae starting above lateral edge, first stria sometimes fading away mid-dorsally. Pygidium slightly concave medially at caudal edge (fig. 5A, B).

♂ legs 17 (fig. 6A, B) simple, rather strongly reduced, with a rather small to medium-sized, often rounded coxal lobe (cxl) and a 4-segmented telopodite.

♂ legs 18 (fig. 6C) simple, slightly reduced, without any evident outgrowths; Syncoxite membranous, with a simple, small and narrowly ogival syncoxite notch (sn) and a 4-segmented telopodite.

Telopods (= ♂ legs 19) (fig. 6D–F) with a large, broad and rounded syncoxite lobe (sl), flanked by two long, spiniform, obliquely truncate, setose syncoxite horns (sh), these being evidently lower than syncoxite lobe (fig. 6D–F). Telopodite 4-segmented, with a spine apically. Prefemur (fig. 6D) subrectangular, with a conspicuous, elongated, robust, tuberculiform, distomesal prefemoral trichostele (pft); in anterior view with a rounded tip, extending to about half or distal boundary of femur. Femur (fig. 6D, E) subtrapezoidal, with a prominent, stout, relatively short femoral trichostele (ft) in anterior view, extending apically to approximately 1/2–3/4 length of prefemoral trichostele (pft), and in posterior view with a rounded, subtriangular femoral process (fp) curved anterolaterally and gently tapering into an acuminate tip rounded distally (fig. 6E). Tibia stout, gently tapering distally and curved basad towards femoral process, with a small, distolateral tibial process (tp) strongly curved mesad (fig. 6D, E). Tarsus the smallest, subcylindrical, moderately sigmoid, strongly curved, narrowly rounded apically, with a robust and small terminal seta (fig. 6D, E).

DNA barcode. The distinction in molecular data strongly supports the validity of this species (0.99 bpp BI and 94% ML; fig. 1). The interspecific divergence between H. nigromaculata sp. n. and the closest species, H. hongkhraiensis , is 9.74% of the COI p-distance (table 2).