Metalycaeus muciferus ( Heude, 1885 )

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: 88-91

publication ID

https://doi.org/10.11646/zootaxa.4331.1.1

publication LSID

lsid:zoobank.org:pub:FB50725E-4D03-4507-9CAF-EB939C7F548F

persistent identifier

http://treatment.plazi.org/id/03CA87D8-FFAA-FF8C-FF0B-F961FAEDF850

treatment provided by

Plazi

scientific name

Metalycaeus muciferus ( Heude, 1885 )
status

 

Metalycaeus muciferus ( Heude, 1885) 

FIGUrEs 58View FIGURE 58 –59, 60, 61.

Alycoeus muciferus Heude, 1885: 96  , pl. 24, figs 1, 1a.

Alycaeus (Orthalycaeus) muciferus  — Möllendorff, 1886: 171. Alycaeus helicodes Gredler, 1887: 365  , new synonym.

Alycaeus (Chamalycaeus) helicodes  — Kobelt & Möllendorff, 1897: 148. Alycaeus (Chamalycaeus) muciferus  — Kobelt & Möllendorff, 1897: 149. Alycaeus (Chamalycaeus) helicodes  — Kobelt, 1902: 356.

Alycaeus (Chamalycaeus) muciferus  — Kobelt, 1902: 359.

Chamalycaeus dolichodirus  (sic!)— Yen, 1939: 30, pl. 2, fig. 37. Chamalycaeus (Chamalycaeus) dolichodirus  (sic!)— Zilch, 1957: 142. Chamalycaeus helicodes  — Zilch, 1974: 193, pl. 7, fig. 4.

Types examined. 7 syNTypEs (MCZ 167230) Of A. muciferus  CHINa, 2 paraLECTOTypEs (SMF 192225) Of A. helicodes  , TCHEN-k'EOU, CHINa, PE-sHaNG, HUNaN, LEG. FUCHs, COLL. GrEdLEr. ACCOrdING TO JOHNsON (1973) paraTypEs Of muciferus  arE aLsO prEsENT IN THE NMNH (INv. NUmbEr: 472340). THEsE wErE NOT ExamINEd by Us. SEE aLsO REmarks.

Museum material examined. C SMF 39254/1 (fIGUrEd IN YEN 1939, pL. 2, fIG. 37, as " Chamalycaeus dolichodirus  "), HaNG-yaNG, HUpEI, CHINa, LEG. FULTON, 1894, COLL. O. BOETTGEr; SMF 346399/1 (mIxEd sampLE wITH D. cristatus  : SMF 39250), PaTUNG, HUpEI, CHINa, COLL. MöLLENdOrff; NHMUK 20150487/2 (TypICaL helicodes  , LabELLEd as dolichodirus  ), CHaNGyaNG, E.R. SykEs COLL.

New material examined. HA/2, 2016/103 CHINa, CHONGqING, CHENGkOU XIaN, DONGaN XIaNG, apprOx. 2 km sOUTH Of DONGaN, arOUNd GUaNyINyaN, 1140 m, 31°45.411'N, 109°05.636'E, LEG. A. HUNyadI, 0 9 JUNE 2016GoogleMaps  ; HA/1, 2016/109 CHINa, CHONGqING, CHENGkOU XIaN, HEyU XIaNG, 5 km NOrTH Of HEyU CUN, vICINITy Of CUOjIkOU, 1260 m, 31°54.286'N, 108°56.407'E, LEG. A. HUNyadI, 12 JUNE 2016GoogleMaps  ; HA/2, 2016/113 CHINa, CHONGqING, CHENGkOU XIaN, LONGTIaN XIaNG, NOrTHErN EdGE Of YOUfaNG, 32°01.205'N, 108°39.924'E, LEG. A. HUNyadI, 13 JUNE 2016GoogleMaps  ; HA/4, 2015/48 CHINa, SICHUaN, CHENGdU SHIAbout SHI, DUjIaNGyaN SHIAbout SHI, QINGCHENGHOUsHaN, UNdEr BaIzHaNG BrIdGE, 1220 m, 30°56.088'N, 103°28.818'E, LEG. A. HUNyadI & M. SzEkErEs, 0 5 JUNE 2015GoogleMaps  , HNHM 99729View Materials /1 (fIGUrEd sHELL); PGB/ 1 ( Ex COLL. K. OHara), 20070714B CHINa, SICHUaN, EmEIsHaN SHIAbout SHI, EsHaN ZHEN, EmEIsHaN, BaILONGdONG, 821 m, 29°34.73141'N, 103°23.32436'E, LEG. Y. NakaHara, K. OHara, K. OkUbO & J.U. OTaNI, 14 JULy 2007GoogleMaps  ; JUO/1, OK/1, 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 2009GoogleMaps  ; HA/2, 2011/15 CHINa, YUNNaN, WENsHaN ZHUaNGzU MIaOzU ZIzHIzHOU, XICHOU XIaN, XINGjIE ZHEN, DadONG 3 km TOwards BaTaNG, LaOLONG, 1195 m, 23°16.067'N, 104°32.215'E, LEG. A. HUNyadI, 22 Mar 2011GoogleMaps  ; OK/2, 20060110G CHINa, GUaNGxI, NapO XIaN, POHE XIaNG, NaCHI, 913 m, 23°16.45981'N, 105°58.97426'E, LEG. K. OHara, K. OkUbO & J.U. OTaNI, 10 JaN 2006; HA/8, 3 jUvENILE/brOkEN sHELLsGoogleMaps  , HNHM 99711View Materials /1, 2013/7 CHINa, GUaNGxI  , HECHI SHIAbout 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 2013GoogleMaps  ; PGB/1 ( Ex COLL. K. OkUbO), 20060110E CHINa, GUaNGxI, NapO XIaN, LONGHE XIaNG, INNEr LONGHE, 990 m, 23°22.91642'N, 105°59.98975'E, LEG. K. OHara, K. OkUbO & J.U. OTaNI, 10 JaN 2006GoogleMaps  ; HE/1, Vn 11-141 VIETNam, Hà GIaNG PrOvINCE, km 105.5 ON rOad 4C, bETwEEN YêN MINH aNd ĐồNG VăN (NE Of Hà GIaNG TOwN), 23°08.996'N, 105°10.332'E, LEGGoogleMaps  . CH. HEmmEN, 21 Mar 2011  ; JUO/4, PGB/1 ( Ex COLL. J.U. OTaNI), 20081113 B VIETNam, Ha GIaNG PrOvINCE, VI XUGEN DIsTrICT  , HUNG Ba COmmUNE, Nam PIa VILLaGE, 216 m, 22°52.064'N, 105°04.184'E, LEG. K. OHara & J.U. OTaNI, 13 NOv 2008GoogleMaps  .

Diagnosis. A smaLL TO mEdIUm sIzEd spECIEs wITH vEry sHOrT R2 aNd R3, R2 HavING TypICaL Metalycaeus  - TypE rIbs aNd R3 LaCkING swELLING.

Description of typical muciferus  . SHELL ( FIGUrE 58AView FIGURE 58) wHITE; sHELL OUTLINE sLIGHTLy OvaL frOm dOrsaL vIEw, spIrE sLIGHTLy ELEvaTEd, EdGE Of bOdy wHOrL rOUNdEd; prOTOCONCH ( FIGUrEs 61C–DView FIGURE 61) CONspICUOUsLy ELEvaTEd frOm dOrsaL sUrfaCE, CONsIsTING Of 1.75 wHOrLs (N = 2), raTHEr maTTE, ITs ENd wITH INCONspICUOUs spIraL sTrIaTIONs; R1 CONsIsTs Of 1.5–1.75 wHOrLs, wITH IrrEGULar, wIdELy-spaCEd rIbs aNd fINE spIraL sCULpTUrE; rIbs sLIGHTLy bECOmING mOrE wIdELyspaCEd TOwards ENd Of R1; TraNsITION bETwEEN R1 aNd R2 NOTAbout NOT CONspICUOUs; R2 wITH dENsE, sHarp, ELEvaTEd rIbs ( FIGUrEs 60E–FView FIGURE 60); CrOss sECTION Of rIbs Of TypICaL muciferus  COULd NOTAbout NOT bE ExamINEd (bUT sEE rEmarks); LENGTH Of R2 aNd R3 vEry sLIGHTLy mOrE THaN a qUarTEr wHOrL COmbINEd (apprOxImaTELy 100 dEGrEEs); R2 LONGEr THaN R3; TraNsITION bETwEEN R2 aNd R3 raTHEr smOOTH, NO CONsTrICTION vIsIbLE; R3 wITH fEw wIdELy-spaCEd wrINkLEs, apErTUrE aLmOsT ExaCTLy rOUNdEd; OUTEr LIp vEry HIGH aNd sHarp, sIGNIfICaNTLy ExpaNdEd aNd sLIGHTLy rEfLECTEd; INNEr LIp sLIGHTLy THICkENEd, NOTAbout NOT CONspICUOUs; bOUNdary bETwEEN TwO LIps HardLy vIsIbLE.

Measurements (in mm). D = 3.3–5.3, H = 2.1–3.4 (N = 18, spECImENs frOm dIffErENT LOCaLITIEs). SEE aLsO TabLE 5.

Operculum. THE OUTEr sUrfaCE Of THE OpErCULUm Of THE TypE sErIEs Of muciferus  aNd helicodes  wErE COvErEd by mUd. UNdEr THE mUd, HOwEvEr, aN ELEvaTEd, mULTIspIraL, wrINkLEd LamELLa was vIsIbLE. BOTH sIdEs Of THE OpErCULUm Of sampLE 20081113 B wErE ExamINEd. THE OUTEr sUrfaCE sHOwEd mULTIspIraL CHaraCTEr wITHOUT ELEvaTEd LamELLa; THE INNEr sIdE Had a vEry smaLL, LOw CENTraL NIppLE sITTING ON THE TOp Of a GradUaLLy ELEvaTEd " HILLAbout HILL ".

Variation in specimens. Metalycaeus muciferus Is  a vEry varIabLE spECIEs IN sHELL sIzE, sHELL sCULpTUrE aNd COLOUr. TabLE 5 COmpILEs THE varIabLE TraITs aNd THEIr CHaraCTEr sTaTEs IN ExamINEd pOpULaTIONs.

Differential diagnosis. Metalycaeus muciferus  CaN bE dIsTINGUIsHEd frOm OTHEr Metalycaeus  spECIEs ON THE basIs Of THE sHOrT R2, aNd THE aLsO sHOrT R3, wHICH LaCks a swELLING IN ITs mIddLE. SEE UNdEr Dicharax bison  n. sp., Metalycaeus heudei  , M. laosensis  n. sp., M. oharai  n. sp. aNd M. latecostatus  .

Distribution. SHELLs assIGNEd TO THIs spECIEs wErE COLLECTEd frOm mULTIpLE CHINEsE prOvINCEs (YUNNaN, GUaNGxI, HUNaN, HUbEI, SICHUaN, CHONGqING, GUIzHOU) aNd NOrTHErN VIETNam ( FIGUrE 57View FIGURE 57).

Remarks. TypICaL Metalycaeus muciferus  ( FIGUrE 58AView FIGURE 58) aNd M. helicodes  (FIGUrE 59B) spECImENs aGrEE IN THE fOLLOwING TraITs: bOTH R2 aNd R3 arE vEry sHOrT; THErE Is NO rECOGNIsabLE CONsTrICTION aT THE bOrdEr Of THE TwO rEGIONs; THE rIbs ON R2 arE wIdELy-spaCEd aNd sHarp; pErIsTOmE rELaTIvELy THIN (aLTHOUGH sOmETImEs ExpaNdEd). WE ExamINEd a NUmbEr Of NEwLy COLLECTEd CHINEsE sampLEs, wHICH aGrEE wITH M. muciferus  aNd M. helicodes  IN THE abOvE mENTIONEd TraITs, aLTHOUGH sHOw dIffErENCEs IN TErms Of spIrE HEIGHT, sCULpTUrE Of R1 aNd sIzE (sEE TabLE 5 aNd FIGUrEs 58View FIGURE 58 –59). NEarLy EvEry sINGLE pOpULaTION wE ExamINEd Has CHaraCTErIsTIC fEaTUrEs, wHICH aLLOws dIsTINGUIsHING IT frOm OTHErs. THEsE dIffErENCEs arE raTHEr mINOr. MOrEOvEr, THEsE sampLEs arE smaLL aNd maINLy CONTaIN wEaTHErEd sHELLs wITHOUT OpErCULa. THErEfOrE wE dO NOTAbout NOT fINd IT rEasONabLE TO dEsCrIbE THEm fOrmaLLy. INsTEad, UNTIL mOrE maTErIaL bECOmEs avaILabLE, wE LIsT aLL THEsE sampLEs aNd HaNdLE THEm UNdEr a sINGLE NamE ( Metalycaeus muciferus  ).

AdOLf ZILCH brOUGHT TwO spECImENs frOm GrEdLEr's COLLECTION (BOzEN = BOLzaNO) TO THE SENCkENbErG MUsEUm. HE mENTIONEd THaT THE LECTOTypE rEmaINEd IN BOLzaNO ( ZILCH 1974), THErEfOrE THE spECImENs IN THE SENCkENbErG MUsEUm arE paraLECTOTypEs (FIGUrE 59B).

THE CrOss sECTION Of R2 was ExamINEd IN ONE spECImEN Of THE pOpULaTION 2015/48 ( FIGUrE 61DView FIGURE 61). ANTErIOr pLaTE raTHEr sTraIGHT, HOLLOw, IT Has a LOw, bUT sHarp rIb; pOsTErIOr CrUsT sTrONG, ONLy sLIGHTLy LOwEr THaN THE aNTErIOr ONE; THE mICrOTUNNEL Has a TEardrOp-sHapEd CrOss sECTION, ITs dIamETEr Is CONspICUOUsLy LarGE IN rELaTION TO THE sIzE Of THE CrUsTs. THE aNTErIOr CrUsT Of TypICaL muciferus  sHELLs Is HOLLOw. SEE aLsO rEmarks UNdEr Alycaeus dolichodeiros  .

SHI

Shihezi Agricultural College

NOT

Nottingham City Natural History Museum

HILL

Sir Harold Hillier Gardens

Kingdom

Animalia

Phylum

Mollusca

Class

Mollusca (awaiting allocation)

Order

Mollusca (awaiting allocation)

Family

Mollusca (awaiting allocation)

Genus

Metalycaeus

Loc

Metalycaeus muciferus ( Heude, 1885 )

Asami, Takahiro 2017

2017
Loc

Chamalycaeus dolichodirus

Zilch 1974: 193
Zilch 1957: 142
Yen 1939: 30

1939
Loc

Alycaeus (Chamalycaeus) muciferus

Kobelt 1902: 359

1902
Loc

Alycaeus (Chamalycaeus) helicodes

Kobelt 1902: 356
Kobelt 1897: 148
Kobelt 1897: 149

1897
Loc

Alycaeus (Orthalycaeus) muciferus

Gredler 1887: 365Mollendorff 1886: 171

1886
Loc

Alycoeus muciferus

Heude 1885: 96