Metalycaeus zayuensis (Zhang, Chen & Zhou, 2008)

Pall-Gergely, Barna, Sajan, Sheikh, Tripathy, Basudev, Meng, Kaibaryer, Asami, Takahiro & Ablett, Jonathan D., 2020, Genus-level revision of the Alycaeidae (Gastropoda, Cyclophoroidea), with an annotated species catalogue, ZooKeys 981, pp. 1-220 : 1

Metalycaeus zayuensis (Zhang, Chen & Zhou, 2008) Fig. 36

Chamalycaeus zayuensis Zhang, Chen & Zhou, 2008: 745, figs 1-4.

Metalycaeus (?) zayuensis - Páll-Gergely et al. 2017: 108.

Type locality.

"Tashan Town, Zayu County (28°04'N, 97°E), Tibet Autonomous Region, China".

Material examined.

Probably lost, see remarks.

Remarks.

The specimens labelled as the types (Tashan Town, Zayu County, Nyingchi City, Tibet Autonomous Region, China, leg. Chen De-Niu, 1980.7.13, IZCAS TM_094538, holotype; IZCAS TM_094540, paratype) of C. zayuensis represent a species different from the one characterised in the original description. Namely, the real C. zayuensis has a smooth R2 with dense stripes, and finely ribbed R1, whereas the ones we examined have elevated, sharp, widely spaced R1 and R2 ribs. Furthermore, the ones in the Beijing Museum have sharp swelling on R3 with an incision at the middle, whereas the ones in the original description possess a relatively low, simple R3 swelling.

Chamalycaeus zayuensis was previously moved to the genus Metalycaeus based on the spiral striation ( Zhouxing and Wechuan 2015; Páll-Gergely et al. 2017).

Figures

Figure 36. Metalycaeus zayuensis (Zhang, Chen & Zhou, 2008), holotype (IZCAS TM _ 094538). Photographs: Kaibaryer Meng.