Lucasioides dissectus Li & Wang, 2024

Wang, Jin, Yao, Chong-Hui, Jiang, Chao & Li, Wei-Chun, 2024, Integrative taxonomy reveals exceptional species diversity of Lucasioides from China (Isopoda: Oniscidea: Agnaridae), Arthropod Systematics & amp; Phylogeny 82, pp. 527-549 : 527-549

publication ID	https://doi.org/ 10.3897/asp.82.e113041
publication LSID	lsid:zoobank.org:pub:B2966C0A-75B7-4B73-A45C-0A2EFB159715
DOI	https://doi.org/10.5281/zenodo.12627262
persistent identifier	https://treatment.plazi.org/id/61A9C129-3A31-4DE1-981F-2BD44154438F
taxon LSID	lsid:zoobank.org:act:61A9C129-3A31-4DE1-981F-2BD44154438F
treatment provided by	Arthropod Systematics & Phylogeny by Pensoft
scientific name	Lucasioides dissectus Li & Wang
status	sp. nov.

Treatment

3.3. 1. Lucasioides dissectus Li & Wang sp. nov.

Figures 6 A View Figure 6 , 7 View Figure 7

Type material.

Holotype. CHINA • ♂; Jiangxi Province, Jiujiang City, Nanshan National Forest Park ; 29.2514 ° N, 116.2071 ° E; el. 79 m a. s. l.; 17. viii. 2022; W. C. Li leg. (DNA nos. NS 2201 , Prep. slide no. L 22090 ) GoogleMaps . — Paratypes. • 3 ♂♂, 2 ♀♀; same data as the holotype (DNA nos. NS 2002 - NS 2004 ) GoogleMaps ; CHINA • 3 ♂♂, 5 ♀♀; Jiangxi Province, Pingxiang City, Nankeng Forest Farm ; 27.4650 ° N, 113.8940 ° E, el. 590 m a. s. l.; 21. vi. 2011; W. C. Li leg. (DNA nos. NKLC 2001 - NKLC 2008 , Prep. slide nos. L 17321 - L 17326 ) GoogleMaps .

Diagnosis.

Pereonite 1 with acute postero-lateral corner; pleopod 1 exopod with bilobed apex, and outer lobe approximate three times as long as inner lobe.

Description.

Body length of males 7.0- 8.5 mm, of females 7.5-9.5 mm. Color in alcohol brown, dorsum granulated, bearing irregular white muscle spots (Fig. 6 A View Figure 6 ). Pereonite 1 sinuous on posterior margin of epimeron, postero-lateral corner acute. Noduli laterales as in Fig. 7 A View Figure 7 . Telson triangular, slightly wider than long, lateral margins concave, apex blunted round; uropod exopodite about twice as long as basipodite (Figs 6 A View Figure 6 , 7 A View Figure 7 ). — Cephalon with triangular median lobe, median lobe shorter than lateral lobes (Figs 6 A View Figure 6 , 7 A View Figure 7 ). Antennula with several aesthetascs on distal tip and antero-lateral margins of third article (Fig. 7 B View Figure 7 ). Antennal flagellum with first segment two thirds as long as second one (Fig. 7 C View Figure 7 ). — Pereopod 1 with brush of long setae on carpus and merus (Fig. 7 D View Figure 7 ). Pereopod 7 ischium with deep depression on rostral surface, carpus slightly expanded near middle on dorsal margin (Fig. 7 E View Figure 7 ). — Pleopods 1-5 exopods with Protracheoniscus - type pseudotrachea (Fig. 7 F-J View Figure 7 ). — MALE: pleopod 1 exopod conspicuously bilobed at posterior tip, outer lobe approximate three times as long as inner lobe, endopod with broad basal part, narrowed towards beak-shaped posterior tip (Fig. 7 F View Figure 7 ); pleopod 2 endopod styliform, nearly as long as exopod (Fig. 7 G View Figure 7 ).

Etymology.

Latin “ dissectus ” = partite. The new species name refers to the male pleopod 1 exopod conspicuously bilobed at apical apex.

Remarks.

The new species is very similar to L. isseli ( Arcangeli, 1927) in having the apical tip of pleopod 1 exopod conspicuously bilobed, and the outer lobe much longer than the inner lobe. But it can be distinguished by the shape of median lobe of the cephalon angled in anterior middle margin, and pereonite 1 with an acute postero-lateral corner (Fig. 6 A View Figure 6 ). In L. isseli , the median lobe of the cephalon is arched in anterior middle margin, and pereonite 1 with a broad rounded postero-lateral corner (Fig. 6 B View Figure 6 ). This species also resembles L. dianensis sp. nov. in having the apical tip of pleopod 1 exopod conspicuously bilobed (Figs 6 A View Figure 6 , 7 View Figure 7 versus 6 C, 8). But it can be distinguished in having the outer lobe of pleopod 1 exopod three times as long as inner lobe (Fig. 7 F View Figure 7 ). In L. dissectus , the outer lobe is twice as long as inner lobe (Fig. 8 F View Figure 8 ). However, the above three species with minor differences in the external appearances or mounted appendages. We are not sure these ambiguous different traits belong to intraspecific variations or interspecific divergences. In the morpho-geometric analysis of geometric morphometrics, the scatter diagrams indicate that the CVAs were able to clearly classify the three species with the first two canonical variables (Figs 3 View Figure 3 , 4 View Figure 4 ). Furthermore, they can also be separated based on molecular analyses (Fig. 5 View Figure 5 ). Thus, we clarified the above dilemma by using the integrative approaches.