Calxattus dengba, Ni & Yu & Zhang, 2025

Calxattus dengba sp. nov.

Figs 1 View Figure 1 , 2 Common name. 僜巴岩跳蛛 View Figure 2

Type material.

Holotype: China • ♂ ( MHBU-ARA-00027415 ); Xizang Autonomous Region: Nyingchi City, Zayu County, Xia Zayu Town ; 9. VIII. 2002; M. Zhu leg.

Etymology.

The specific epithet is derived from the Dengba people, who live in Zayu County, the type locality of the new species. Noun in apposition.

Diagnosis.

The male of the new species can be distinguished from its sole congeneric species, C. serratus , by the following: (1) the RTA lacks processes on its prolateral and retrolateral edges (Figs 1 E View Figure 1 , 2 B View Figure 2 ; vs. in C. serratus , the RTA carries median processes on both prolateral and retrolateral edges; see Wang et al. 2023: figs 5 B, 7 B); (2) the embolus is relatively short, originates from the median portion of the palpal bulb and terminates near the midpoint of the lower edge of the groove-shaped embolic guide (Figs 1 E View Figure 1 , 2 B View Figure 2 ; vs. in C. serratus , the embolus is long, originates from the lower portion of the bulb and terminates through the groove-shaped embolic guide near the functional conductor; see Wang et al. 2023: figs 5 B, 7 B); and (3) the median apophysis is located in the upper half of the retrolateral part of the bulb (Figs 1 E View Figure 1 , 2 B View Figure 2 ; vs. in C. serratus , the median apophysis is located in the lower half of the retrolateral part of the bulb; see Wang et al. 2023: figs 5 B, 7 B).

Description.

Male. Measurements of holotype: total length 7.26. Carapace 3.52 long, 2.47 wide. Abdomen 3.34 long, 2.28 wide. Eye measurements: AME 0.63, ALE 0.26, PME 0.43, PLE 0.37. Leg measurements: I 14.18 (3.78, 1.35, 4.47, 2.91, 1.67), II 7.89 (2.80, 0.96, 2.28, 1.35, 0.50), III 7.74 (2.41, 0.87, 1.86, 1.84, 0.76), IV 11.39 (3.07, 0.83, 3.04, 3.27, 1.18); leg formula 1423. Chelicera (Fig. 1 C View Figure 1 ) brown, with six promarginal and seven retromarginal teeth. Carapace (Fig. 1 A, B View Figure 1 ) reddish-brown, eye surroundings black, clypeus and eye surroundings covered by sparse white setae, fovea dark and longitudinal slit-like. Endites and labium yellowish-brown, with brown setae at distal end; sternum flat and creamy yellow, covered with white and brown setae. Legs (Fig. 1 A View Figure 1 ) dark yellow, bearing long and thin spines; leg I extra long. Abdomen (Fig. 1 A View Figure 1 ) pale yellow and elongated oval, surface faded; dorsal side with visible grey bands at edge, ending near spinnerets; short yellow setae covered on dorsal lateral sides of anterior half; ventral side with fine or flattened setae in middle part. Spinnerets (Fig. 1 A View Figure 1 ) yellow, covered with white setae.

Palp (Figs 1 D – F View Figure 1 , 2 A – C View Figure 2 ): embolus thread-like, terminating near midpoint of embolic guide in ventral view; median apophysis black, hook-like in ventral view, located in upper half of retrolateral part of bulb, near functional conductor; functional conductor fan-shaped, with plow-like furrows on surface; membranous tegular apophysis transparent, curved in middle portion, originating from tegular apex and covering half of basal embolus; retrolateral and ventral tibial apophyses finger-like in ventral view, surface of retrolateral tibial apophysis with fingerprint-like patterns.

Female. Unknown.

Distribution.

China (Xizang).