Metalycaeus, Pilsbry, 1900

Asami, Takahiro, 2017, Revision of the Alycaeidae of China, Laos and Vietnam (Gastropoda: Cyclophoroidea) I: The genera Dicharax and Metalycaeus, Zootaxa 4331 (1), pp. 1-124 : 108

Metalycaeus (?) zayuensis (Zhang, Chen & Zhou, 2008)

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

Type locality. "TasHaN TOwN, ZayU COUNTy (28°04'N 97°E), TIbET AUTONOmOUs REGION, CHINa ".

Original description. " SHELL smaLL, THIN, sUbdEprEssEd, sEmITraNsparENT. WHOrLs 3½–4, mOdEraTELy CONvEx, spIrE LOw, CONOId, THE bOdy wHOrL dEsCENdING IN frONT. SHELL sUrfaCE yELLOwIsH brOwN IN COLOUr, THE bOdy wHOrL aNd THE pENULTImaTE wHOrL wITH fINELy aNd sOmEwHaT rEGULarLy rIb-sTrIaE, bUT THE prOTOCONCH aNd THE sECONd wHOrL wITHOUT rIb-sTrIaE, GENEraLLy smOOTH, LUsTEr. ApEx bLUNT, sUTUrE dEEp. THE bOdy wHOrL wITH a 0.86 mm LONG wOrmfOrm prOjECTION aT THE sUTUrE 1.42 mm frOm THE apErTUrE. ApErTUrE CIrCULar, THICk, aNd sOmEwHaT ExpaNdEd aNd rEfLECTEd, wITH a NECk. OpErCULUm CIrCULar, sINk, wITH a papULE-fOrm prOjECTION IN THE INNEr sUrfaCE. UmbILICUs wIdE, rEGULarLy wIdENING. RadULa wITH 1 CENTraL TOOTH, 1 LaTEraL aNd 1 marGINaL TOOTH. THE CENTraL TOOTH wITH 5 CUsps, LaTEraL TOOTH wITH 3–4 CUsps, marGINaL TOOTH wITH 4 CUsps."

Remarks. WE Had NO pOssIbILITy TO ExamINE THE TypE spECImENs. THE pHOTOs aNd THE dEsCrIpTION Of THE OrIGINaL dEsCrIpTION wErE INsUffICIENT fOr THE dECIsION abOUT THE spECIEs' GENErIC assIGNmENT. ZHOUxING aNd WECHUaN (2015) pUbLIsHEd pHOTOs Of Chamalycaeus zayuensis , wHICH arE sImILar TO THE pHOTOs IN THE OrIGINaL dEsCrIpTION, bUT arE Of bETTEr qUaLITy. SpIraL sTrIaTION ON R1 aNd sHarp, wIdELy spaCEd rIbs ON R2 arE vIsIbLE ON THE pHOTO Of ZHOUxING aNd WECHUaN (2015). BasEd ON THEsE, Chamalycaeus zayuensis Is TENTaTIvELy CLassIfIEd IN THE GENUs Metalycaeus .