Dicharax microcostatus Páll-Gergely, 2017

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 : 66

publication ID	https://doi.org/ 10.11646/zootaxa.4331.1.1
publication LSID	lsid:zoobank.org:pub:FB50725E-4D03-4507-9CAF-EB939C7F548F
DOI	https://doi.org/10.5281/zenodo.6004442
persistent identifier	https://treatment.plazi.org/id/03CA87D8-FFBC-FF97-FF0B-FF57FB57FB60
treatment provided by	Plazi
scientific name	Dicharax microcostatus Páll-Gergely
status	sp. nov.

Treatment

Dicharax microcostatus Páll-Gergely View in CoL n. sp.

FIGUrE 34C View FIGURE 34 .

Type material. HOLOTypE HNHM 99708 About HNHM , PGB/1 paraTypE ( Ex COLL. K. OHara), 20070709B CHINa , SICHUaN, TaIaN ZHEN, QINGCHENGHOUsHaN, DUjIaNGyaN SHI, CUIyINGHU TO UppEr sTaTION Of JINLI CabLE sTaTION, 1273 m , 30°56.27110'N, 103°28.75198'E, LEG. Y. NakaHara , K. OHara, K. OkUbO & J.U. OTaNI, 0 9 JULy 2007; HA/1 wEaTHErEd sHELL ( NOT paraTypE), 2015/48 CHINa GoogleMaps , SICHUaN, CHENGdU SHI, DUjIaNGyaN SHI, QINGCHENGHOUsHaN, UNdEr BaIzHaNG BrIdGE, 1220 m , 30°56.088'N, 103°28.818'E, LEG. A. HUNyadI & M. SzEkErEs, 0 5 JUNE 2015.

Etymology. THE spECIfIC EpITHET rEfErs TO THE smaLL sIzE aNd rIbbEd sHELL Of THIs NEw spECIEs.

Diagnosis. A smaLL spECIEs wITH rIbbEd R1, sHOrT R2 aNd R3, sHarp swELLING ON R3 aNd CrENULaTEd pErIsTOmE.

Description. SHELL ( FIGUrE 34C View FIGURE 34 ) yELLOwIsH; sHELL OUTLINE rOUNdEd frOm dOrsaL vIEw, spIrE sLIGHTLy ELEvaTEd, EdGE Of bOdy wHOrL rOUNdEd; prOTOCONCH LOw, CONsIsTING Of 1.5 wHOrLs, wE Had ONLy wEaTHErEd maTErIaL THErEfOrE sCULpTUrE COULd NOT bE ExamINEd; R1 CONsIsTs Of 1.75 wHOrLs, rEGULarLy, fINELy rIbbEd; TraNsITION bETwEEN R1 aNd R2 raTHEr smOOTH; R2 vEry dENsELy rIbbEd, rIbs CUrvEd TOwards apErTUrE; CrOss-sECTIONaL vIEw Of R2 COULd NOT bE ExamINEd, bUT prObabLy sImILar TO THOsE Of THE OTHEr spECIEs HavING CUrvEd rIbs; COmbINEd LENGTH Of R2 aNd R3 sHOrT, apprOxImaTELy 70 dEGrEEs ONLy; R2 aNd R3 Of abOUT THE samE LENGTH; TraNsITION bETwEEN R2 aNd R3 CLEarLy vIsIbLE dUE TO sLIGHT CONsTrICTION bETwEEN R2 aNd R3; ENd Of R3 wITH a CONspICUOUs swELLING; R3 smOOTH aNd GLOssy; apErTUrE rOUNdEd, pErIsTOmE ExTErNaLLy sLIGHTLy CrENULaTEd; INNEr LIp THICkENEd, OUTEr LIp vEry wEak bUT sHarp.

Measurements (in mm). D = 3.1, H = 2.0–2.2 (N = 2, TypE sampLE).

Operculum. THE INNEr sUrfaCE COULd NOT bE ExamINEd, bUT a CENTraL NIppLE Is dIsCErNIbLE dUE TO THE sEmI- TraNsparENT CHaraCTEr Of THE OpErCULUm. THE OUTEr sUrfaCE Is sEEmINGLy smOOTH, NO mULTIspIraL LamINa Is vIsIbLE.

Variation in specimens. THE fEw kNOwN ExampLEs sHOw LITTLE varIabILITy IN sHELL CHaraCTErs.

Differential diagnosis. Dicharax microcostatus n. sp. CaN bE dIsTINGUIsHEd frOm aLL CHINEsE aNd VIETNamEsE CONGENErs by THE smaLL sHELL sIzE aNd THE vEry sHOrT R2. Dicharax draco n. sp. Has a mOrE ELEvaTEd spIrE aNd a mUCH mOrE sTrONGLy CrENULaTEd pErIsTOmE. THE vEry varIabLE Dicharax fimbriatus dIffErs frOm D. microcostatus n. sp. by THE LONGEr R2 aNd R3, aNd THE swELLING ON R3, wHICH Is sITUaTEd IN GrEaTEr dIsTaNCE frOm THE pErIsTOmE, THaN IN THE NEw spECIEs. SEE UNdEr Dicharax micropolitus n. sp.

Distribution. Dicharax microcostatus n. sp. Is kNOwN frOm THE TypE LOCaLITy ONLy ( FIGUrE 7 View FIGURE 7 ).