Exalloniscus stilifer, Taiti & Cardoso, 2020

Exalloniscus stilifer View in CoL n. sp.

Figures 15, 16, 22F

urn:lsid:zoobank.org:act:

Material examined

CHINA: Holotype: ♂ ( MNHN), Guangxi Province, Chongzuo, Longzhou Xian, Shanglong Xiang , Nong Guang , 22°28’26.1”N 107°00’16.7”E, 177 m a.s.l., cave, GoogleMaps

14.IV.2010, leg. L. Deharveng, M.Y. Tian and A. Bedos. Paratype: 1 ♀ ( MNHN), same data as holotype GoogleMaps .

Description

Length: ♂ 5 mm; ♀ 6 mm. Body oval, flattened ( Figure 15A); colour pale brown ( Figure 22F). Dorsum covered with large scattered triangular scale-setae ( Figure 15B). Cephalon ( Figure 15C,D) with lateral lobes triangular with rounded apices, slightly protruding frontally; frontal and suprantennal line slightly bent down in middle; eyes absent. Pereonites with postero-lateral corner progressively more acute, directed backwards ( Figure 15A,E). Pleonites 3-5 with epimera falciform, directed backwards. Telson triangular, wider than long, with straight sides and widely rounded apex. Antennula ( Figure 15F) third article with several superimposed aesthetascs plus apical pair. Antenna ( Figure 15G) fifth article of peduncle shorter than flagellum; ratio of flagellum joints 12:9:13; second flagellar article with two and third article with three aesthetascs. Buccal pieces as in E. schmalfussi n. sp. Pereopods with dactylar seta flagelliform. Pereopod 1 ( Figure 16B) carpus with transversal antennal grooming brush. Pereopod 7 ( Figure 16C) basis with distinct water conducting system. Uropod ( Figure 16A) exopod distinctly longer than endopod.

Male: Pereopod 1-3 carpus with long setae on sternal margin ( Figure 16B). Pereopod 7 ( Figure 16C) merus, carpus and propodus with sparse setae on sternal margin, ischium sternal margin straight. Pleopod 1 ( Figure 16D) exopod triangular, wider than long, outer margin concave, posterior point acute with some short setae at apex; endopod with distal part styliform. Pleopod 2 exopod ( Figure 16E) triangular, longer than wide, with few setae on outer margin. Pleopod 3-5 exopods ( Figure 16 F-H) triangular, longer than wide, with few setae on outer margin.

Etymology

Latin: stilus = stylet + stem of ferre = to bear. The name refers to the styliform distal part of the male pleopod 1 endopod.

Remarks

The new species is readily distinguishable from all the other species in the genus by the shape of male pleopod 1 endopod with a long and narrow distal part.