Pincerna yaanensis, Z.-G. Chen, 2022

Páll-Gergely, Barna, 2023, Revision of the Alycaeidae of China, Laos and Vietnam (Gastropoda: Cyclophoroidea) II: The genera Alycaeus and Pincerna, Zootaxa 5249 (2), pp. 253-276 : 274

publication ID

https://doi.org/ 10.11646/zootaxa.5249.2.4

publication LSID

lsid:zoobank.org:pub:81426096-9E0D-4E3D-9B1A-660B4D1BBB65

DOI

https://doi.org/10.5281/zenodo.7687466

persistent identifier

https://treatment.plazi.org/id/8B1E6842-FF80-733F-FF34-FD9BFD822660

treatment provided by

Plazi

scientific name

Pincerna yaanensis
status

 

Pincerna yaanensis View in CoL Z.-Y. Chen, 2022

( Figs 5J–R View FIGURE 5 )

Pincerna yaanensis View in CoL Z.-Y. Chen, 2022: 118.

Type locality. “ Bifengxia scenic spot [ AEIJ ẈṃḆḢ], Bifengxia town [ AEIJ Ẉffi ], Yaan City [Bdzm], Sichuan Province [Ɓffl ẘ], China, 102°59′23″E, 30°04′26″N ” GoogleMaps .

Additional material examined. CHINA, Sichuan, Chengdu Shi, Dujiangyan Shi, Qingcheng Shan , Fangningqiao 200 m towards Zushidian , 1130 m a.s.l., 30°54.337′N, 103°33.282′E (locality code: 2015/53), leg. Hunyadi, A., 6 June 2015, HA/1 ( Fig. 5N–R View FIGURE 5 ) GoogleMaps .

Distribution. This species is known from two closely situated localities in central Sichuan. Here I report this species from another site ca. 100 km north from the known localities ( Fig. 6 View FIGURE 6 ).

Remarks. Pincerna yaanensis is a recently described species from central Sichuan. According to the original description, it is larger than P. costulosus , it has a ribbed R3 (smooth in P. costulosus ), has a more convex body whorl, denser ribs, and an umbilicus completely covered by the reflected peristome. After examining several P. costulosus shells belonging to multiple populations, the differences between P. costulosus and P. yaanensis do not seem to be convincing. The difference in size between P. yaanensis and P. costulosus is only minimal; the difference regarding R3 is not correct, because some P. costulosus shells (even syntypes, see Fig. 8E–H View FIGURE 8 ) have ribs on R3; the rib density is also variable across populations of P. costulosus (although probably still denser than in any P. costulosus shell); and the umbilicus is completely covered in some P. costulosus shells (see Fig. 8E–H View FIGURE 8 ). Pincerna yaanensis should be kept as an independent species because of the R3 of P. costulosus has a central swelling, whereas it is shifted towards the aperture in P. yaanensis .

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Architaenioglossa

Family

Alycaeidae

Genus

Pincerna

Loc

Pincerna yaanensis

Páll-Gergely, Barna 2023
2023
Loc

Pincerna yaanensis

Chen, Z. - Y. 2022: 118
2022
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