Koreoniscus racovitzai (Arcangeli, 1927)

Porcellio (Lucasius) Racovitzai Arcangeli, 1927: 228, fig. 7.

Koreoniscus racovitzai: Verhoeff 1937: 421; Flasarova 1972: 102–111, figs 24–47.

Koreoniscus Racovitzai: Arcangeli 1952: 301.

Mongoloniscus chevronus Yang & An, 2021: 265–274, figs 1–3. syn. nov.

Examined material.

China: 19 spms (20200912002 – 20200912004, - 7, 20200913001, - 4, 20200914001 – 20200914003), Jilin Province, Ji’an, Koguryo Archaeological Site Park (41.1210 ° N, 126.1845 ° E), 210 m asl., 12–14. ix. 2020, coll. Chao Jiang ; 8 spms (20200912011 – 20200912016), Daqiangfenggou (40.9276 ° N, 125.9505 ° E), 330 m asl., 12. ix. 2020, coll. Chao Jiang . 10 spms (20210904027 – 20210904034), Liaoning Province, Huanren Manchu Autonomous County, Zhangyue Park (41.2600 ° N, 125.3480 ° E), 270 m asl., 4. ix. 2021, coll. Chao Jiang ; 1 spm (20210905002), Gucheng Town (41.4764 ° N, 125.3832 ° E), 380 m asl., 5. ix. 2021, coll. Chao Jiang ; 1 spm (20210907033), Xinbin Manchu Autonomous County (41.7193 ° N, 124.7979 ° E), 310 m asl., 7. ix. 2021, coll. Chao Jiang .

Remarks.

In the present study, we identified the above specimens by integrating morphological characters and COI sequences. The results demonstrate that not only their morphological traits were the same as M. chevronus, but also the COI sequences were 100 % identical to the sequence from the type material of M. chevronus (GenBank: MW 792415) (Yang and An 2021). Thus, we used these materials to analyze the relationships between M. chevronus and the other species.

Morphologically, this species is distinctly differing from other Mongoloniscus species by its pereonite epimera with a “ convex-concave-convex ” margin. It is noteworthy that this trait is an essential diagnostic character of Koreoniscus . Based on further comparison of the descriptions and illustrations of M. chevronus (Yang and An 2021: figs 1–3) and K. racovitzai (Flasarová 1972: figs 24–31; Kwon 1993: fig. 11), in addition to the above results obtained through phylogenetic analyses (the genetic distance between M. chevronus and Koreoniscus racovitzai was nearly 0 %, Suppl. material 1: table S 2; M. chevronus and Koreoniscus racovitzai formed a clade with high support, Fig. 2), and with the external morphology and the coordinates of noduli laterales on pereonites, we consider M. chevronus Yang & An, 2021 as junior synonym of Koreoniscus racovitzai (Arcangeli, 1927) .

Distribution.

China (Liaoning, Jilin), Japan, Korea.