Metalycaeus oharai Páll-Gergely & Hunyadi, 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 : 93-96

Metalycaeus oharai Páll-Gergely & Hunyadi n. sp.

FIGUrEs 48C–F , 62A–B , 63C–D .

Type material. HOLOTypE HNHM 99712 , PGB/1 paraTypE (bOTH spECImENs Ex COLL. K. OHara), 20111019 B CHINa, GUaNGxI, HUaNjIaNGmaONaNzU ZIzHIxIaN, DaCaI XIaNG, NONGmaOsHICHaNG, 201 m, 24°45.566'N, 108°21.945'E, LEG. T. IsHIbE, K. OHara, K. OkUbO & J.U. OTaNI, 19 OCT 2011 ; OKA /1 paraTypE, PGB/1 paraTypE (Ex COLL. K. OkUbO), 20150220A CHINa, GUIzHOU, GUIyaNG SHI, XIfENG XIaN, YONGjING ZHEN, XIfENG XIaN, LEG. K. OkUbO 20 FEb 2015 ; OKA /1 paraTypE, PGB/1 paraTypE (Ex COLL. K. OHara), PGB/1 paraTypE ( Ex COLL. K. OkUbO), 20090310A CHINa, HUNaN, CHENxI XIaN, HUOma ZHEN, YaNzIdONG, 455 m, 27°51.284'N, 110°15.623'E, LEG. K. OHara, K. OkUbO & J.U. OTaNI, 10 Mar 2009 ; PGB/1 paraTypE ( Ex COLL. K. OkUbO), 20090310B CHINa, HUNaN, CHENxI XIaN, HUOma ZHEN, YaNzIdONG, bELOw raNGEr sTaTION, 158 m, 27°52.053'N, 110°15.041'E, LEG. K. OHara, K. OkUbO & J.U. OTaNI, 10 Mar 2009 ; JUO/1 paraTypE, OKA /1 paraTypE, PGB/1 paraTypE ( Ex COLL. K. OkUbO), 20090311A CHINa, HUNaN, JINGzHOU MIaOzU DONG ZUzIzHIxIaN, HENGjIaNGqIaO XIaNG, LONGfENGyaN, 357 m, 26°27.382'N, 109°34.650'E, LEG. K. OHara, K. OkUbO & J.U. OTaNI, 11 Mar 2009 ; OK/1 paraTypE, 20090308A CHINa, GUIzHOU, TONGrEN SHI, YaNGTOU ZHEN, JIULONGdONG, 422 m, 27°42.527'N, 109°19.576'E, LEG. K. OHara, K. OkUbO & J.U. OTaNI, 0 8 Mar 2009 ; PGB/1 paraTypE ( Ex COLL. K. OkUbO), 20061015 A CHINa, GUIzHOU, XIfENG XIaN, YONGjING ZHEN, XUaNTIaNdONG, 1342 m, 27°07.286'N, 106°45.376'E, LEG. K. OkUbO 15 OCT 2006 ; JUO/10 paraTypEs, OKA /7 paraTypEs, PGB/1 paraTypE (Ex COLL. K. OkUbO), PGB/2 paraTypEs (Ex COLL. K. OHara), PGB/1 paraTypE (Ex. COLL. J.U. OTaNI), 20090307A CHINa, GUIzHOU, SHICHENG XIaN, GaNxI XIaNG, HUayaNdONG, NO GPS rECOrd, LEG. K. OHara, K. OkUbO & J.U. OTaNI, 0 7 Mar 2009 ; JUO/4 paraTypEs, OKA /3 paraTypEs, PGB/1 paraTypE ( Ex COLL. K. OkUbO), 20090307B CHINa, GUIzHOU, ZHENyUaN XIaN, WUyaNG ZHEN, SITE NO. 1, WUyaNGHE SCENIC DIsTrICT, 489 m, 27°03.522'N, 108°18.683'E, LEG. K. OHara, K. OkUbO & J.U. OTaNI, 0 7 Mar 2009 ; JUO/1 paraTypE, OK/3 paraTypEs, PGB/1 paraTypE (Ex COLL. K. OkUbO), PGB/1 paraTypE ( Ex COLL. K. OHara), 20090306A CHINa, GUIzHOU, HUaNGpING XIaN, FEIyUNdaxIaGU, 803 m, 26°55.116'N, 108°01.787'E, LEG. K. OHara, K. OkUbO & J.U. OTaNI, 0 6 Mar 2009 ; HA/1 paraTypE, 2013/7 CHINa, GUaNGxI, HECHI SHI, NaNdaN XIaN, CLIffs SE Of EN CUN, 630 m, 25°04.163'N, 107°36.176'E, LEG. A. HUNyadI & M. SzEkErEs, 11 SEp 2013 ; HA/18 paraTypEs, 2013/6 CHINa, GUaNGxI, HECHI SHI, Bama XIaN, CLIffs NEar JIaOLE CUN, 590 m, 24°7.045'N, 107°7.847'E, LEG. A. HUNyadI & M. SzEkErEs, 10 SEp 2013 ; PGB/1 paraTypE (Ex COLL. K. OkUbO), PGB/1 paraTypE ( Ex COLL. K. OHara), 20060715A CHINa, GUaNGxI, BamayaOzU ZIzHIxIaN, JIaOyUETIaNkENG, 285 m, 24°06.92707'N, 107°06.81754'E, LEG. Y. NakaHara, K. OHara, K. OkUbO & J.U. OTaNI, 15 JULy 2006 ; PGB/2 paraTypEs ( Ex COLL. K. OHara), 20111023 E CHINa, GUaNGxI, DaHUayaOzU ZIzHIxIaN, LImING XIaNG, HONGjUNyaN, 255 m, 23°48.374'N, 107°31.455'E, LEG. T. IsHIbE, K. OHara, K. OkUbO & J.U. OTaNI, 23 OCT 2011 ; OK/1 paraTypE (wEaTHErEd sHELL), 20111023 F CHINa, GUaNGxI, PINGGUO XIaN, DUIwEI XIaNG, GUIyaN, 102 m, 23°41.580'N, 107°49.879'E, LEG. T. IsHIbE, K. OHara, K. OkUbO & J.U. OTaNI, 23 OCT 2011 ; HA/11 paraTypEs, 2013/27 CHINa, GUaNGxI, CHONGzUO SHI, LONGzHOU XIaN, WUdE XIaNG, CLIffs S Of QUNHE CUN, 370 m, 22°34.851'N, 106°46.024'E, LEG. A. HUNyadI & M. SzEkErEs, 24 SEp 2013 .

Additional material. SMF 39304/4, S. HUNaN, CHINa , COLL. MöLLENdOrff; SMF 201257 /5, CHINa, HUNaN , COLL. JaECkEL; SMF 39305/116 (mIxEd sampLE wITH Dicharax cristatus : SMF 346400 ), HUNaN, CHINa , COLL. MöLLENdOrff; SMF 50013/2, HUNaN, CHINa , COLL. MöLLENdOrff, SMF 39241/11; CHINa, HUNaN , COLL. NaEGELE; NHMUK 1891.3.17.781–783/3, CHINa, HUNaN, LEG. HUNGErfOrd ; NHMUK 20150488 /4, HUNaN ; NHMW 75000 /E/35976/3, CHINa, PrOvINz HUNaN , COLL. EdLaUEr Ex COLL. BLUmE; MNHN IM-2012-27034 /2, YUNaN (prObabLy ErrONEOUs LOCaLITy, IT COULd bE HUNaN) , COLL. LETELLIEr; MNHN IM-2012-27033 /2, HUNaN , COLL. JOUssEaUmE; SMF 39244/6, CHINa, S. HUNaN , COLL. MöLLENdOrff; SMF 109788 /2, CHINa: HUNaN , COLL. K.L. PfEIffEr Ex COLL. JETsCHIN Ex COLL. MöLLENdOrff 1907 Ex COLL. ObErwImmEr ; NHMW 111544 /5, HUNaN ; NHMW 71640 /O/11690/5, HUNaN , COLL. ObErwImmEr, Ex COLL. MUs. SENCkENbErG; NHMW 71770 /R/16/2, HUNaN , COLL. RUšNOv Ex COLL. BLUmE; NHMW 71640 /O/8090/5, HUNaN , COLL. OvErwImmEr Ex COLL. MöLLENdOrff; NHMUK 20150489 /3, HUNaN (?), CHINa, E.R. SykEs COLL. 1954.

Etymology. THIs NEw spECIEs Is dEdICaTEd TO aNd NamEd afTEr OUr frIENd, KENjI OHara, wHO prOvIdEd maNy sHELL spECImENs fOr THIs rEvIsION.

Diagnosis. A mEdIUm sIzEd spECIEs wITH vEry LONG R2 HavING TypICaL Metalycaeus -TypE rIbs, a bLUNT swELLING ON R3 aNd a rOUNdEd apErTUrE.

Description of the type series. SHELL ( FIGUrE 62A ) yELLOwIsH IvOry; spIrE ELEvaTEd, bOdy wHOrL rOUNdEd; prOTOCONCH ( FIGUrE 63C–D ) ELEvaTEd, CONsIsTING Of 1.5 wHOrLs, fINELy spIraLLy sTrIaTEd; THE fOLLOwING 1.75 wHOrLs rEGULarLy rIbbEd, rIbs sHarp aNd bECOmING sTrONGEr fOrward; R1 wITH CLEarLy vIsIbLE, fINE spIraL LINEs rEsULTING IN a rETICULaTEd sUrfaCE; TraNsITION bETwEEN R1 aNd R2 smOOTH, rIbs ON R2 ( FIGUrEs 48C–F ) abOUT 2–3 TImEs mOrE dENsELy arraNGEd as IN R1, rIbs vEry sHarp aNd HIGH; CrOss sECTIONaL vIEw Of R2 was ExamINEd IN ONE spECImEN frOm THE TypE LOCaLITy: aNTErIOr CrUsT fOrms a rELaTIvELy LOw, sHarp, HOLLOw rIb; aNTErIOr CrUsT fOLds OvEr THE mUCH wEakEr pOsTErIOr CrUsT wITH a sTrONGLy dEvELOpEd prOjECTION; pOsTErIOr CrUsT NOT, Or vEry sLIGHTLy HOLLOw; CrOss sECTIONaL vIEw Of mICrOTUNNEL HEmIspHErICaL, dIamETEr rELaTIvELy LarGE COmparEd wITH sIzEs Of CrUsTs; R2 aNd R3 sLIGHTLy LEss THaN a HaLf wHOrL COmbINEd; THEIr bOUNdary NOT CONspICUOUs; R2 aNd R3 sEparaTEd by a sLIGHT CONsTrICTION; R3 wITH a bLUNT swELLING IN THE mIddLE; R3 IrrEGULarLy rIbbEd, rIb dENsITy sImILar TO THaT THE ENd Of R1; apErTUrE rOUNdEd; OUTEr pErIsTOmE ExpaNdEd, sLIGHTLy rEfLECTEd, wITH sECONdary wIdENING IN dIrECTION Of UmbILICUs; INNEr LIp sIGNIfICaNTLy THICkENEd; bOUNdary bETwEEN TwO LIps vIsIbLE, bUT NOT CONspICUOUs.

Measurements (in mm). D = 4.1–5.2, H = 3.0–3.5 (N = 19).

Operculum. THE OUTEr sUrfaCE Of THE OpErCULUm was ExamINEd IN a sINGLE spECImEN (20111019 B); IT Is GLOssy, NO ELEvaTEd LamELLa Is vIsIbLE, bUT THE mULTIspIraL sTrUCTUrE Is CLEarLy rECOGNIsabLE. THE INNEr sUrfaCE COULd NOT bE ExamINEd.

Variation in specimens. CONsIdErING THE LarGE dIsTrIbUTIONaL arEa Of THIs spECIEs, THE varIabILITy bETwEEN pOpULaTIONs Is raTHEr LOw, aNd vIsIbLE mOsTLy IN THE spIrE HEIGHT aNd THE THICkNEss Of THE pErIsTOmE. SEE aLsO REmarks UNdEr M. rathouisianus .

Differential diagnosis. Metalycaeus oharai n. sp. dIffErs frOm M. heudei n. sp. by THE absENCE Of THE swELLING ON R3. Metalycaeus oharai n. sp. dIffErs frOm M. muciferus by THE LONGEr R2 aNd THE prEsENCE Of a CONsTrICTION aT THE bOrdEr Of R1 aNd R2. THE smaLLEr M. rathouisianus Has UsUaLLy a sHOrTEr R2, Has LEss rEfLECTEd OUTEr LIp aNd mOrE THICkENEd INNEr LIp. MOrEOvEr, THE rIbs ON R3 arE dENsEr IN M. rathouisianus . SEE aLsO UNdEr M. latecostatus aNd Dicharax dolichodeiros .

Distribution: Metalycaeus oharai n. sp. Is kNOwN frOm wEsTErN GUaNGxI, EasTErN GUIzHOU aNd wEsTErN HUNaN prOvINCEs ( FIGUrE 57 ).

Remarks. SEE REmarks UNdEr M. rathouisianus .

Figures

FIGURE 48. R 2 ribs of Metalycaeus species. A – B. Metalycaeus (?) awalycaeoides Páll-Gergely & Hunyadi, n. sp. (holotype, HNHM 99730). C – F. Metalycaeus oharai Páll-Gergely & Hunyadi, n. sp. (C – E. holotype, HNHM 99712. F. paratype from the type locality, coll. PGB). Arrows show the edge of the overfolding anterior crust. All images: B. Páll-Gergely.

FIGURE 57. Distribution of Metalycaeus species. Empty diamond. Metalycaeus zayuensis (Zhang, Chen & Zhou, 2008). Filled triangle. Metalycaeus oharai Páll-Gergely & Hunyadi n. sp. Filled square. Metalycaeus (?) awalycaeoides Páll- Gergely & Hunyadi, n. sp. Circles. Metalycaeus muciferus (Heude, 1885). Empty triangle, top down. Metalycaeus laosensis n. sp. Empty circles indicate figured populations of Metalycaeus muciferus. 1. Tchen K’eou (Chengkou), the type locality of Alycaeus muciferus Heude, 1885. 2. Changyang (SMF 39254). 3. 2015 / 48. 4. 20070714 B. 5. Pe-shang (type locality of Alycaeus helicodes Gredler, 1887). 6. 2013 / 7. 7. 2011 / 15.

FIGURE 62. Shells of Metalycaeus species. A. Metalycaeus oharai Páll-Gergely & Hunyadi n. sp. (holotype, HNHM 99712). B. Metalycaeus oharai, 20061015 A (paratype), coll. PGB. C. Metalycaeus (?) okuboi Páll-Gergely & Hunyadi, n. sp. (holotype, HNHM 99713). D. Metalycaeus (?) okuboi, paratype (20050314 A, coll. PGB). A Scale represents 5 mm. All photos: B. Páll-Gergely.

FIGURE 63. Protoconchs of Metalycaeus species. A – B. Metalycaeus rathouisianus (Heude, 1882) (syntype of A. dolomiticus MCZ 167209). C – D. Metalycaeus oharai Páll-Gergely & Hunyadi n. sp. (holotype, HNHM 99712). All images: B. Páll- Gergely.