Lucasioides nudus Li, 2017, sp. n.
Creators: name: Li, Weichun
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Trachelipodidae
Lucasioides
Lucasioides nudus

description: Lucasioides nudus sp. n.
Type material. Holotype: male, China, Jiangxi Province, Yichun City, Tonggu County (28°32′N, 114°22′E), Xiangutan, ca. 1200 m, 14 September 2011, leg. Weichun Li (L16032).
Paratypes: 4 males, 15 females, same data as the holotype (L201601̄L201619).
Diagnosis. Cephalon with well-developed median lobe (Fig. 2 C, D). Pereonite 1 with acutely postero-lateral corners and sinuous posterior margin of epimeron (Fig. 2 D). Male pleopod 1 endopod without setules; exopod distally bilobed, outer lobe much shorter and broader than acute triangular inner lobe (Fig. 3 K, L).
Description. Maximum body length 7.0 mm. Body elongated (ca. twice as long as wide) (Fig. 2 A); colour in alcohol dark grey with usual pale muscle spots. Dorsum distinctly granulated. No gland pores. Noduli laterales on pereonites 2̄4 farther from lateral margin than ones on pereonites 1 and 5̄7, b/c and d/c co-ordinates as in Fig. 2 B.
Cephalon (Fig. 2 C, D) median lobe obtuse triangular, dorsally concave, and protruding upwards in middle; lateral lobes rounded.
Pereonite 1 (Fig. 2 D) with acutely postero-lateral corners; posterior margin of epimeron sinuous.
Antennula (Fig. 3 A) with first and second articles almost evenly wide; third article narrowing towards 3 aesthetascs.
Antenna (Fig. 3 B) with fifth article equipped with 1 seta at distal margin; flagellum with second article approximately twice as long as first article, ending with 1 aesthetasc.
Mandibles (Fig. 3 C, D) with molar penicil consisting of several plumose setae arising from stem; left mandible with 1 + 2 penicils, right mandible with 1 + 1 penicils.
Maxillula (Fig. 3 E) with inner lobe bearing 2 stout setulose penicils; outer lobe ending with 3 + 5 teeth of various sizes.
Maxilla (Fig. 3 F) imperfectly divided into 2 lappets; small lappet suffused with tiny setae near lateral margin at subapical part; apical part of large lappet covered with small setae on outer half.
Maxilliped (Fig. 3 G) endite subapically with 1 penicil, apical margin sinuous and bearing 3 teeth; palp with 1 well-developed spine and 4 setae.
Telson and uropod (Fig. 3 H). Telson triangular, lateral margin slightly concave; uropod with short exopod, about twice as long as protopod.
Male. Pereopod 1 (Fig. 3 I) with brush of long setae on sternal margins of carpus and merus. Pereopod 7 (Fig. 3 J) ischium with 7 setae on ternal margin, rostral surface with deep depression; carpus not enlarged. Pleopod 1 (Fig. 3 K, L) endopod with distal part beak-shaped and bent outwards, no setules; exopod ovate, distally bilobed, outer lobe much shorter and broader than inner lobe, inner lobe acute triangular. Pleopod 2 (Fig. 3 M) endopod styliform, longer than exopod. Pleopod 5 exopod as in Fig. 3 N.
Distribution. China (Jiangxi) (Fig 1).
Etymology. The specific name is derived from the Latin nudus = naked, referring to the male endopod of pleopod 1 without setules.
Remarks. This species is similar to Lucasioides isseli (Arcangeli, 1927) in the general shape and morphology of male pleopod 1. It is distinguished by the pereonite 1 with acutely postero-lateral corners (Fig. 2 D), the male pleopod 1 endopod being without setules (Fig. 3 K), the outer lobe of exopod being much broader than the inner lobe (Fig. 3 L); in L. isseli pereonite 1 is with rounded postero-lateral corners (Kwon & Taiti 1993: fig. 163), the male pleopod 1 endopod bears setules at the apical part, and the outer lobe of exopod is as broad as the inner lobe (Kwon & Taiti 1993: fig. 168).
description: Published as part of Li, Weichun, 2017, A new species of Lucasioides Kwon (Isopoda: Oniscidea: Agnaridae) from China, pp. 495-500 in Zootaxa 4216 (5) on pages 496-497, DOI: 10.5281/zenodo.242379