Revision of the Alycaeidae of China, Laos and Vietnam (Gastropoda: Cyclophoroidea) I: The genera Dicharax and Metalycaeus Author Asami, Takahiro text Zootaxa 2017 2017-10-11 4331 1 1 124 journal article 31855 10.11646/zootaxa.4331.1.1 14c29731-224f-43a4-ae52-f76823177ce5 1175-5326 1009725 FB50725E-4D03-4507-9CAF-EB939C7F548F Dicharax abdoui Páll-Gergely , n. sp. FIGUrE 6 . Type material. HOLOTypE MNHN IM- 2012-27329 aNd 2 paraTypEs MNHN IM- 2012-27328, 6L07 LaOs , KHammOUaNE PrOvINCE , apprOx. 9 km NE Of THakHEk (MUaNG KHammOUaN ), 190 m , 17°26.757'N , 104°52.937'E , ON aNd UNdEr rOCks IN dry sECONdary fOrEsT ON aNd UNdEr NW ExpOsEd CLIffs, LEG. A. AbdOU & I.V. MUraTOv, 27 NOv 2007 . Etymology. THIs NEw spECIEs Is dEdICaTEd TO aNd NamEd afTEr AHmEd AbdOU (MNHN), wHO COLLECTEd THE sHELLs. Diagnosis. A vEry smaLL spECIEs wITH wIdELy-spaCEd rIbs ON R1 (NEar THE sUTUrE aNd IN THE UmbILICUs), vEry sHOrT R2 wITH dENsE, LOw rIbs, aNd R3 wITH bLUNT swELLING. Description of the holotype . SHELL wHITIsH, raTHEr GLOssy, aLTHOUGH aLL spECImENs wErE sOmEwHaT wEaTHErEd; sHELL OUTLINE OvaL frOm dOrsaL vIEw; bOdy wHOrL rOUNdEd; prOTOCONCH LOw, NEarLy smOOTH, wITH ExTrEmELy fINE pITs arraNGEd IN spIraL rOws (NOT HOmOLOGOUs wITH THE spIraL sTrIaTION Of Metalycaeus spECIEs); bOUNdary bETwEEN prOTOCONCH aNd R1 HardLy dIsCErNIbLE; LENGTH Of R1 apprOxImaTELy 1.5 wHOrLs; R1 NEarLy smOOTH, wITH LOw, wIdELyspaCEd rIbs NEar sUTUrE aNd IN UmbILICUs; bOUNdary bETwEEN R1 aNd R2 CLEarLy vIsIbLE bECaUsE R2 fINELy rIbbEd; R2 vEry sHOrT, wITH LOw, dENsE rEGULar rIbs (apprOx. 20); R3 apprOx. TwO TImEs LONGEr THaN R2, smOOTH wITH LOw, bLUNT swELLING; CONsTrICTION bETwEEN R2 aNd R3 sHaLLOw; apErTUrE rOUNdEd, pErIsTOmE NOrmaLLy THICkENEd OvEraLL; OUTEr pErIsTOmE sLIGHTLy ExpaNdEd ON THE dOrsaL sIdE bUT NOT rEfLECTEd; INNEr pErIsTOmE NOT CONspICUOUs, rELaTIvELy wEak. Measurements (in mm). D = 2.0, H = 0.9 (N = 2, HOLOTypE aNd paraTypE ). Operculum. UNkNOwN. Variation in specimens. THErE Is NO NOTabLE varIaTION bETwEEN THE THrEE sHELLs Of THE TypE sampLE. SEE aLsO rEmarks. Differential diagnosis. THE mOsT sImILar spECIEs IN TErms Of sHELL sIzE Is D. ellipticus n. sp. , wHICH Has a smOOTH R2, aNd a CONspICUOUsLy THICkENEd basaL pErIsTOmE. Distribution. THIs NEw spECIEs Is kNOwN frOm THE TypE LOCaLITy ONLy. SEE aLsO REmarks aNd FIGUrE 7 . Remarks. A sHELL ( 2009/105 CHINa , GUaNGxI , BOsE SHI, LINGyUN XIaN, XIajIa XIaNG, sOUTHEasTErN EdGE Of XIajIa, rOCky waLL abOvE THE TOmbs, 440 m , 24°17.508'N , 106°38.376'E , LEG. A. HUNyadI, 22 OCT 2009 , HA/1) Is sImILar TO D. abdoui n. sp. bECaUsE Of THE smaLL sHELL sIzE, aNd THE sHOrT, fINELy rIbbEd R2. ON THE OTHEr HaNd, IT Has a rEGULarLy, fINELy rIbbEd R1, aNd a mOrE ExpaNdEd OUTEr pErIsTOmE THaN THaT Of THE TypE sampLE Of D. abdoui n. sp. FUrTHErmOrE, aNOTHEr sHELL ( 2011/20 CHINa , YUNNaN , WENsHaN ZHUaNGzU MIaOzU ZIzHIzHOU, GUaNGNaN XIaN, BabaO ZHEN, BabaO NE 1.5 km , LafaNG, 1138 m , 23°44.321'N , 105°25.304'E , LEG. A. HUNyadI, 24 Mar 2011 , HA/ 1) Is aLsO sImILar TO D. abdoui n. sp. IN pOssEssING a rIbbEd R2, bUT dIffErs frOm THaT spECIEs by THE rEGULarLy, sTrONGLy rIbbEd R1, aNd THE sHOrTEr R3 wITHOUT a swELLING. MOrE maTErIaL Is NECEssary TO dECIdE wHETHEr THEsE TwO sampLEs arE CONspECIfIC wITH D. abdoui n. sp.