Mongoloniscus Verhoeff, 1930

Jiang, Chao, Zhong, Jing, Wang, Zhidong, Li, Weichun & Huang, Luqi, 2024, Taxonomic study on the genus Mongoloniscus Verhoeff, 1930 (Isopoda, Agnaridae) from China: morphological and phylogenetic analyses, ZooKeys 1202, pp. 229-253 : 229-253

Genus Mongoloniscus Verhoeff, 1930

Type species.

Mongoloniscus koreanus Verhoeff, 1930 , by subsequent designation.

Notes.

Previous studies have ascribed eighteen species to the genus Mongoloniscus ; however, some do not conform to the criteria proposed by Kwon (1993). In the present study, we provide the typical habitus of the genus (Fig. 3 ) and adopt a more restrictive interpretation, asserting that a species can be classified as Mongoloniscus if exhibiting all the following characters:

Dorsum granulated, with numerous gland pores along the entire margin of the pereonites.

Noduli laterales more or less at the same distance from lateral margin, with a d / c value less than 0.75.

Cephalon with well-developed median lobe and lateral lobes, median one convex or arched on anterior margin.

Pereonite 1 posterior margin straight or rounded.

Pleopodal exopods 1–5 with monospiracular internal lungs.

Pleopod 1 exopod with bilobed apex, and posterior tip of endopod bent outwards.

Figures

Figure 3. Habitus of Mongoloniscus sinensis (Dollfus, 1901), male A dorsal view, the blue circles show the noduli laterales arrangement B cephalon and pereonites 1 and 2 in dorsal view C pleopod 1 exopod D pleopod 1 endopod.