A new species of Amphidromus from Laos (Gastropoda, Pulmonata, Camaenidae)

2004·1 MB·English

by  Lehmann, Helmut

BASTERIA, 68:17-20
A new species of Amphidromus fromLaos
(Gastropoda, Pulmonata, Camaenidae)
HelmutLehmann
Eichendorffstrasse32,D48324Sendenhorst,Germany
& Wim+J.M.Maassen
Nationaal Natuurhistorisch Museum,P.O.Box 9517,NL2300 RALeiden, TheNetherlands
The dextralspeciesAmphidromusprotaniaspec.nov.is describedfromLaos. Itsgenitalanatomy
is comparedwith that ofotherAmphidromusspecies. Some notesonconchologicallysimilar
taxa areadded.
Key words: Gastropoda,Pulmonata,Camaenidae,Amphidromus,taxonomy,anatomy,SE Asia,
Laos.
INTRODUCTION
During a collection-trip to Laos in June and July 2003 the senior author collected
materialof anumberofAmphidromus species, oneof whichwithanunusualshellshape.
Itturnedoutthatthatspecies isnotdealtwithinthemonographofPilsbry (1900)andalso
not in thecatalogue ofLaidlaw & Solem(1961). Inmorerecent additionalpapers dealing
withAmphidromus(Djajasasmita, 1982;Dharma, 1993;Panha,1996)the species isalso not
mentioned, which supports our feeling that it is new to science. Many Amphidromus
species are known,but wefound only asingle conchologically somewhatsimilaronein
theliterature.
Abbreviationsforshellcharacters:H,shellheight;W, shellwidth.For collections(the
numberofspecimens is indicated afteraslash): KW, collnK.Kittel, Wiesthal;LS, collnH.
Lehmann, Sendenhorst; RMNH, Nationaal Natuurhistorich Museum, Leiden; SMF,
Natur-Museum Senckenberg; VS, colln. J. J.Vermeulen, Singapore; ZMB, Zoologisches
Museum,Museum fiirNaturkunde derHumboldt-Universitat,Berlin; ZSM,Zoologische
Staatssammlung, Miinchen.
SYSTEMATICPART
AmphidromusAlbers,1850:138(part.).Typespecies,bysubsequentdesignation(vonMartens,1860:
184):Helix perversus Linne,1758.
Amphidromus (Amphidromus) protania spec. nov. (figs 1-4)
Material examined. - Type series: SouthLaos,Salavan province,nearthe villageBanDonxe, ona
18 BASTERIA,Vol. 68,No. 1-3, 2004
Figs 1-3.Amphidromusprotania spec. nov. 1, holotype (RMNH 98143), actual height 31.2 mm; 2-3,
paratypes(LS),Laos,Salavan province,BanDonxé,actualheights26.2-30.4mm.PhotographsbyJ.Goud,
Leiden.
small, dry, limestone plateaubetweenrice fields and the east bank ofthe Se Donriver, 15°10'543"N
106°13'749"E;H. Lehmann leg., 29.vi.2003 (RMNH 98143/holotype, 98144/4; SMF/4; ZMB/4; ZSM/4;
KW/4;LS/16).
Excluded from the type series: Central Laos, Khammouane province, 25 km N ofThakek, T.
Whittenleg.(VS/1),and Bolikhamsayprovince,5kmSE ofLaksao,T. Whittenleg. (VS/1).
Description. - Shell dextral, conical, perforate, yellow to white, covered by a very
thin, in live snails greenish, periostracum; relatively small, with 6-6.5 slightly convex
whorls. Apex dark-brown,obtuse, withamicrosculpture ofvery finepits. Thevery deli-
cate periostracum has finespiral striae;if thisis missing, the shellsaredullandsmooth
with only some irregular growth-lines. Aperture ovate, whitishinside. Peristomewhite,
narrowly expanded, withaninconspicuous callus along theparietal side.Theumbilicus
is avery narrow chink.There is not muchvariation in thecolour-pattern. Almostalways
thereis anarrow, darkbrown,sub-suturalband.Some specimens havea second, mostly
interrupted, narrow, brownbandnear themiddleof theupperwhorls, which sometimes
continuesonthebody whorl.
Dimensions: H26.2-31.3 mm; W16.0-18.4 mm.Theholotypemeasures31.2 x 17.8mm
Anatomy. - Vas deferenslong, thin,entering theepiphallus laterally. Flagellum slen-
der, much longer than penis and epiphallus together. Epiphallus slender, much longer
thanthe smallpenis. Lumen ofthe penis with distinct longitudinal pilasters, covered at
theupperpart nearthe shortsubglobular vergewithathin,additionallayer oftissue with
a differenttexture, stillshowing the pilasters underneath.Penial retractor attached clear-
lyabovethejunctionof penisandepiphallus. Vaginavery longandwide,forming along,
uniformtube with the basally swollen pedunculus. Vagina connected with numerous
Lehmann & Maassen:A newspecies ofAmphidromusfrom Laos 19
Fig. 4.Anatomical details ofAmphidromusprotaniaspec.nov.4,genitalapparatus,with cross-sections(a-
e) throughtheflagellum(a),epiphallus(b),penis(c), vagina(d),and pedunculus(e)and a detailofthe
lumen with theverge and pilastersoftheopenedpenialcomplex (f).
strong fibresto theadjacent body wall. Upper halfof thepedunculus thin, withalarge
bursa. Free oviductshort.
Remarks. - Laidlaw & Solem (1961) summarized the data on the genital anatomy.
Accordingtothispublicationitishardlypossible tousemostoftheolddataontheanatomy
becausetheidentificationofthespecies isuncertain,orsinceonlytheexteriorofthegenitalia
is described.Only Bishop (1977) and Solem(1983) gaveusefuldescriptions of theinternal
structureoftheterminalpartsofthegenitalia. Panha(2001)published figuresoftheexternal
aspects ofthegenitaliaofsixAmphidromus species fromThailand.
According to Solem (1983) bothradulaand jaw structures cannot beused toidentify
Amphidromus species. Hefoundhowever,thatthestructuresoftheterminalgenitaliamaybe
diagnostic astheyareknowntobeinothercamaenidgenera.Thejuniorauthor,whileinves-
tigating 13 Amphidromus species from the entire range of the genus (except for the
Philippines), cametothesamepreliminaryconclusion.
Amphidromus protaniaspec.nov. differsclearly fromtheotherAmphidromus speciesby its
conicalshellshape in combinationwith thecolourpattern. Conchologically mostsimilaris
Amphidromus tanyaiPanha,1996.Thisis thespecies that isreferredtoinalaterpaper(Panha
etal„ 2001:109, fig. 1)asA.af. haematostomusvonMoellendorff, 1898. Inthelatterpaperthe
figureusedin theoriginaldescriptionofA.tanyaibyPanha (1996:fig. 1),isusedoncemore.
Amphidromus protania spec. nov.is distinctly larger thanA. tanyai, lacks theblue subsutural
band,andpossesses anopenumbilicusandadark-brownapex.As maybeconcludedfrom
thefigurespublished by Panha (1996:fig. 1),theshellsofA. tanyai arenot smoothbuthave
20 BASTERIA, Vol. 68,No. 1-3, 2004
adistinct, spiral sculpture.
On thebasis of itsgenitalanatomicalcharacters,A.protania spec.nov. shouldbeclassi-
fied withAmphidromus (Amphidromus). Panha(1996) originally placed A. tanyai, without
knowing itsanatomy, in thesubgenus Syndromus Pilsbry, 1900,butPanhaetal. (2001:107),
referring toitasA.af. haematostomusclassifiedthespecies withthenominate subgenus.
ThetrueAmphidromus haemastostomus(Zilch, 1953:132,pi. 22figs4-5) fromitstypelocal-
ity, theBoloven Plateau(Laos, Pakxong province), was rediscovered by the senior author
nearthatplace ina large population. This species differsfrom A. tanyaimostclearly by its
sinistral,moreelongated shell,withadarkbrownparietalcallus.Itischaracterizedanatom-
icallyby thepresenceofavery shortflagellumandashort, conicalvergeandshouldbe clas-
sifiedwithAmphidromus (Syndromus).
So far, Amphidromus protania spec.nov. is only known fromthetypelocality. The shells
fromCentralLaos are not regarded asparatypesbecausethey are in aratherpoorcondition
anderoded.
Derivationominis.- Thespecies isnamedinhonourofthe daughterTania of thesenior
author,who died 28years old afteraheavyillness.
ACKNOWLEDGEMENTS
Weareparticularly grateful toMrJ.Goud(RMNH), whomadethephotographs, and
to Mrs Sompheth Khammanivong (Luang Prabang, Laos), the interpreter and guide in
Laos, who made it possible by her engaged help that many interesting Amphidromus
species couldbe collected.
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