Lucasioides digitatus Li & Wang 2024, sp. nov.
Creators: name: Wang, Jin
name: Yao, Chong-Hui
name: Jiang, Chao
name: Li, Wei-Chun
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Agnaridae
Lucasioides
Lucasioides digitatus

description: 3.3. 3.Lucasioides digitatusLi & Wang sp. nov.
Figures 6 D, 9
Type material.
Holotype. CHINA • 1 ♂; Jiangxi Province, Yichun City, Jingan County, Sanzhualun; 29.0490 ° N, 115.2611 ° E, el. 220 m a. s. l.; 19. vii. 2012; W. C. Li leg. (DNA no. SZL 2002, Prep. slide nos. L 17309 - L 17314). — Paratypes. • 3 ♀♀; same data as the holotype (DNA nos. SZL 2001, SZL 2003 and SZL 2004).
Diagnosis.
Cephalon with arched median lobe; pereonite 1 with blunted postero-lateral corner; pleopod 1 exopod with finger-like outer lobe, inner lobe inconspicuous.
Description.
Body length of males 6.2 mm, of females 6.3-8.0 mm. Color in alcohol blackish brown or yellowish brown, dorsum granulated, bearing irregular white muscle spots (Fig. 6 D). Pereonite 1 sinuous on posterior margin of epimeron, postero-lateral corner blunted. Noduli laterales on pereonites as in Fig. 9 A. Telson triangular, width about one and half times as long as length, lateral margin slightly concave, apex blunted round; uropod exopodite about twice as long as basipodite (Figs 6 D, 9 A). — Cephalon with arched median lobe, median lobe nearly as long as lateral lobes (Figs 6 D, 9 A). Antennula with several aesthetascs on distal tip and antero-lateral margins of third article (Fig. 9 B). Antennal flagellum with second segment twice as long as first one (Fig. 9 C). — Pereopod 1 with brush of long setae on carpus and merus (Fig. 9 D). Pereopod 7 ischium with deep depression on rostral surface, carpus slightly expanded near middle on dorsal margin (Fig. 9 E). — Pleopods 1-5 exopods with Protracheoniscus - type pseudotrachea (Fig. 9 F-J). — MALE: pleopod 1 exopod slightly concave at posterior margin, outer side with finger-like lobe, inner lobe inconspicuous, endopod with broad basal part, narrowed towards beak-shaped posterior tip (Fig. 9 F); pleopod 2 endopod styliform, nearly as long as exopod (Fig. 9 G).
Etymology.
Latin “ digitatus ” = finger-like. The new species name refers to the male pleopod 1 exopod with a finger-like lobe on outer side.
Remarks.
The new species is very similar to L. isseli (Arcangeli, 1927) in having the cephalon with an arched median lobe, and the first pereonite with a blunted postero-lateral corner. But it can be distinguished in having the pleopod 1 exopod with an undeveloped inner lobe (Fig. 9 F). In L. isseli, the inner lobe of pleopod 1 exopod is well-developed (Kwon 1993: fig. 168). In the mounted appendages, this species resembles L. nudus Li, 2017 and L. schmidti sp. nov. Furthermore, the molecular data recognized both species as distinct taxonomic entities (Fig. 5).
description: Published as part of Wang, Jin, Yao, Chong-Hui, Jiang, Chao & Li, Wei-Chun, 2024, Integrative taxonomy reveals exceptional species diversity of Lucasioides from China (Isopoda: Oniscidea: Agnaridae), pp. 527-549 in Arthropod Systematics & amp; Phylogeny 82 on pages 527-549, DOI: 10.3897/asp.82.e113041