Mongoloniscus crenatus Jiang, Li & Huang, 2024

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

publication ID

https://doi.org/ 10.3897/zookeys.1202.113560

publication LSID

lsid:zoobank.org:pub:B493B7C6-9977-4A6C-B9D4-D4A865468DC8

DOI

https://doi.org/10.5281/zenodo.11266501

persistent identifier

https://treatment.plazi.org/id/EC0C4DA8-298F-51E8-8C64-DC5864647036

treatment provided by

ZooKeys by Pensoft

scientific name

Mongoloniscus crenatus Jiang, Li & Huang
status

sp. nov.

Mongoloniscus crenatus Jiang, Li & Huang sp. nov.

Figs 4 A, B View Figure 4 , 5 View Figure 5 , 6 View Figure 6

Type material.

Holotype. China: ♂ ( 20210417001 ), Sichuan Province, Baoxing County, Muping Town, Lengmugou Provincial Geological Park (30.3699 ° N, 102.8125 ° E), 1020 m asl., 14. iv. 2021, coll. Chao Jiang. GoogleMaps

Paratypes. China: 3 ♂♂, 8 ♀♀ ( 20210417002 20210417012 ), same data as the holotype GoogleMaps . 4 ♂♂, 6 ♀♀ ( 20210412063 20210412066 ), Hubei Province, Yichang, Xiaoxita Forestry Park (30.7853 ° N, 111.3180 ° E), 100 m asl., 12. iv. 2021, coll. Zhidong Wang & Tianyun Chen GoogleMaps . 1 ♂ ( 20210512006 ), Shaanxi Province, Zhashui County, Lengbinggou Village (33.6931 ° N, 109.0239 ° E), 1020 m asl., 12. x. 2021, coll. Chao Jiang GoogleMaps . 3 ♂♂, 1 ♀ ( 20210417016 20210417019 ), Sichuan Province, Baoxing County, Dengchigou (30.5341 ° N, 102.9410 ° E), 1810 m asl., 17. iv. 2021, coll. Chao Jiang GoogleMaps ; 3 ♂♂, 1 ♀ ( 20210416040 20210416043 ), Qionglai, Datong Village , Dalong Road (30.5042 ° N, 103.3063 ° E), 770 m als., 14. iv. 2021, coll. Chao Jiang GoogleMaps ; 5 ♂♂, 24 ♀♀ ( 120220827008 20220827025 ), Hanyuan County, Fuling Town, Hanyuan Service Area (29.4370 ° N, 102.6343 ° E), 1080 m asl., 27. viii. 2022, coll. Chao Jiang GoogleMaps ; 6 ♂♂, 9 ♀♀ ( 20220828036 20220828048 ), Tianquan County, Binhe Park (30.0584 ° N, 102.7597 ° E), 760 m asl., 28. viii. 2022, coll. Chao Jiang GoogleMaps ; 18 ♂♂, 23 ♀♀ ( 20220829013 20220829028 ), Wenchuan County, Yingxiu Town (31.0557 ° N, 103.4887 ° E), 880 m asl., 29. viii. 2022, coll. Chao Jiang GoogleMaps .

Diagnosis.

Cephalon with median lobe convex, medially with a small incision. Antennal flagellum with distal article twice as long as proximal article. Noduli laterales almost at same distance from the lateral margins. Pereopod 6 basis and pereopod 7 ischium fringed with long setae. Pleopod 1 exopod deeply bilobed at apex, inner lobe much longer than outer lobe; apex of male pleopod 1 endopod bent outwards and pointed.

Description.

Body length of males 7–9 mm and females 8–11 mm. Body elongated and convex, ~ 2–2.5 × as long as widest pereonite. Dorsum distinctly granulated, brown-gray color with usual yellowish muscle spots. Numerous gland pores along entire pereonite margin. Pereonite 1 with rounded postero-lateral corner, posterior margin nearly straight. Noduli laterales almost at the same distance from lateral margins (Fig. 4 A, B View Figure 4 ). Telson triangular, approximately twice as wide as long, lateral margins slightly concave at distal one third, posterior apex blunted; uropodal exopod ~ 2–2.5 and 1.5–2 × as long as protopod in males and females, respectively; protopod with an incision on outer margin (Figs 4 A, B View Figure 4 , 5 B View Figure 5 ).

Cephalon with rounded lateral lobe no evidence surpasses eyes, median lobe convex, medially with a small incision (Fig. 5 A View Figure 5 ). Eyes with 15–19 ommatidia. Antenna with fifth article of peduncle longer than flagellum; flagellum with distal article 1.6–2.1 × as long as proximal one (Fig. 5 C View Figure 5 ).

Pereopod 1 bearing brush of long setae on its carpus and merus (Fig. 5 D View Figure 5 ). Pereopod 6 basis fringed with long setae and a distal protrusion on sternal margin (Fig. 5 E View Figure 5 ). Pereopod 7 ischium with sternal margin slightly concave and fringed with setae, rostral surface with shallow depression; carpus slightly expanded on the tergal margin (Fig. 5 F View Figure 5 ).

Pleopods 1–5 exopods with monospiracular internal lungs (Fig. 5 G – K View Figure 5 ). Male: pleopod 1 exopod oval, with robust sinuous outer margin; apex deeply bilobed and bearing several setae, inner lobe much longer than outer lobe (Fig. 5 G View Figure 5 ). Pleopod 2 exopod nearly triangular, bearing one line of setae on the outer margin (Fig. 4 H View Figure 4 ). Pleopod 1 endopod with broad basal part, narrowed towards apex, apex bent outwards and pointed (Fig. 5 G View Figure 5 ); pleopod 2 endopod longer than exopod, distal article thin and long (Fig. 5 H View Figure 5 ).

Remarks.

The new species resembles M. koreanus in morphology. It can be distinguished from the latter by the cephalon median lobe medially with a small incision, pereopod 7 with an unexpanded carpus on the tergal margin, and pleopod 1 endopod with a pointed distal apex. In M. koreanus , the cephalon median lobe is medially continuous, pereopod 7 has an expanded carpus on the tergal margin, and the distal apex of the pleopod 1 endopod is blunted. Furthermore, this species and M. koreanus formed two clades with high support in the phylogenetic analysis (Fig. 2 View Figure 2 ), and their interspecific distances were much higher than their intraspecies distances (Suppl. material 1: table S 2).

Etymology.

Latin crenatus = notched. The new species name refers to the anterior margin of the cephalon with a small notch in the middle. We suggest the Chinese common name as “ 刻痕蒙潮虫 ”.

Distribution.

China (Hubei, Shaanxi, Sichuan).

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Isopoda

Family

Agnaridae

Genus

Mongoloniscus