Sporocysts，mother and daughter rediae, and cercariae of Allocreadium gotoi （Hasegawa and Ozaki, 1926） Shimazu, 1988 （Digenea：Allocreadiidae）are briefly described from Pisidium nikkhoense Mori（Bivalvia：Pisidiidae） collected in a small river at Midori, Iiyama, Nagano prefecture, central Japan. New localities of this species in Nagano prefecture are added

Takeshi Shimazu

嶋津 武

The University of Nagano Repository / 長野県立大学リポジトリ

Brief notes on the life cycle and geographical
distirbution of Allocreadium gotoi (Digenea:
Allocreadiidae) in Nagano, Japan
著者名（英） Takeshi Shimazu
journal or
publication title
Journal of Nagano Prefectural College
volume 57
page range 59-62
year 2002-12
URL http://id.nii.ac.jp/1118/00000213/
Creative Commons : 表示 - 非営利 - 改変禁止
http://creativecommons.org/licenses/by-nc-nd/3.0/deed.ja
JournalofNaganoPrefecturalCollege，No．57，pp・59－62，December2002
BriefNotesontheLifeCycleandGeographicalDistributionof
Allocゼαdiumgotoi（Digenea：Allocreadiidae）inNagano，Japan
TakeshiSHIMAZU＊
Abstract：Sporocysts，mOtheranddaughterrediae，andcercariae ofAllocプ唱αdium
gotoi（Hasegawa and Ozaki，1926）Shimazu，1988（Digenea：Allocreadiidae）are
brieflydescribedfromPisidh〝乃乃ikhoenseMori（Bivalvia：Pisidiidae）Collectedina
smallriveratMidori，Iiyama，Nagano Prefecture，CentralJapan．Newlocalities of
thisspeciesinNagano Prefectureareadded．
Key words：Allocnadhlm gOtOもDigenea，1ife cycle，rediae，CerCariae，Pibidhlm
nikkoense，neWlocalities，Nagano．
Hasegaya and Ozaki（1926）described a
newgenusandspeciesofdigenean，Macrolecith－
usgoioi，Onthebasisoftheadultsfoundinthe
intestine of Misgurnus anguillicaudatus
（Cantor）（Osteichthyes：Cobitidae）from
Japan．Shimazu（1988）transferredthisspecies
to the genus Allocreadium Looss，1900，aS A．
gotoi（Hasegawa and Ozaki，1926）；and rede－
SCribedthespeciesonthebasisofthemuseum
and his own specimens obtained from M．an－
gaf沼gcα〟血お，“mOrOko”［＝？Gプ名α摘心か即プ7
camtlescelW（Sauvage）］（Cyprinidae），and
Chaenogobius annularis Gill（the middle
reaches type）（now Gb，mnqgObius pMeYiens
Stevenson）（Gobiidae）at several placesin
Japan．
Thelife cycle ofthe species has not been
known．Istudiedthelifecycleinasmallriver
in Nagano Prefecture，CentralJapan．This
paperbrieflydescribessporocysts，mOtherand
daughter rediae，and cercariae of the species
Obtained during this study and refers to new
localitiesofthespeciesinNaganoPrefecture．
Materials and Methods
A total of139clams of Pisidium nikkoense
Moril＝P（P）cinereum nikkoense Mori］
＊〟邸乃ロ　グ頑cf〝mJ CoJ毎狩，8－49－7　〟まねち
入物乃0380－8525㌧ノ毎）α札
59
（Bivalvia：P si iidae）Werecollectedinasmall
river at Midor ，Iiyama，Nagano Prefecture，
CentralJapan，On3and23November1992and
9December1994．Theywerecrashedforcercar－
iaean m tacercariaeofdigeneans．Dozens of
amphipods，isopod ，and aquaticinsectlarvae
Of several species（notidentified to species）
Were COllectedinthe river and examined for
m t cercariaeofdigeneans．
Sporocysts，rediae，and cercariae obtained
fromthecrashedhostswereslightlyflattened，
fixed n70％ethanol，Stained with alum car－
mine，andmounte in Canadabalsam．Cercar－
iae which had spontaneously emerged out of
hosts were fixedin hotlO％formalin．Some
SpOrOCyStS，rediae，andcercariaewereobserved
aliveforthes udyoftheexcretorysystem．
Drawingsweremadewiththeaidofadraw－
ing ube，SOmewith upplementswithfree－hand
detailsfromlivingmaterial．Measurementsare
glVenin microm ter ．Representatives of the
SpeCimens studied have been depositedinthe
National Science Museum，Tokyo（NSMT）
（NSMT－P15215）．
Results
Ofthe139clams ofP nikkoense crashed，9
Wereinfected with sporocysts，mOther and
daughter rediae，and cercariae of a digenean
SpeCies，eaCh with a few．The exact site of
Takeshi SHIMAZU
Figs．ト4．SporocystandrediaeofAllocreadiumgotoifoundinPisidium nikkoense．1：Sporocyst，1iving．2：
Smallmotherredia，living．3：Youngdaughterredia，living．4：Maturedaughterredia，Whole－
mounted，anteriortipofbodyfoldedup．Scalebars＝200JLm．
infectionofthehostswiththeparasiteswasnot
determined．None of the clams，amphipods，
isopods，and aquaticinsectlarvae examined
harboredanymetacercariaeofA．gotoi．
The morphology and measurements of the
SpOrOCyStS，mOther and daughter rediae，and
CerCariae were as follows．
劾orocysts（Fig．1）．Three whole－mOuntS
measured．Body sausage－Shaped，409－535long
by117159wide，COntaining many developing
mother rediaein body cavity．Flame cells2，
bearing alarge fun－Shaped flame（37wide by
29long），located at differentlevels of body；
excretory canals opening side by side at near
Oneend ofbody．
Mother rediae（Fig．2）．Smallmotherrediae，
SOOn after having emerged out of sporocysts，
possesslng a pharynx，a Small saccularintes－
tine，andexcretoryorganslocated at different
levelsonrightandleftsidesofbody；flame－Cell
formula［（2）＋（3）］＝10．Young mother
rediaesimilarinmorphologytoyoungdaughter
rediae（Fig．3），but containing many develop－
lng daughter rediaewith excretory organs as
described above．
Daughterγ柁dkle（Figs．3and4）．Six whole－
mountsmeasured．Bodyelongate，624－1170long
by136－273wide，COntaining many developing
CerCariae nbodycavity．Pharynx22－40longby
24－46wid ．Intestine saccular，Small，Slightly
largerthanphary x．Excretoryorganslocated
at differentlevels on right andleft sides of
body；fla e－Cellformula［（2）＋（3）］＝10．
Cercarhle（Figs．5and6）．Fourhotformalin－
fixed cercariae measured．Of ophthalmoxi－
phidiocercous　type．Body elongate－OVal，un－
armed，194－220longby86－102wide；numerOuS
Sma l protuberances arrangedin a circle on
periphery ofbody aroundventralsucker．Tail
Slender，240－250long by50－52wide，Without
finfold．TransversenervecommissureJuStpOSL
teriortopha ynx．Eyespots2，1arge，812by6－
8， ocated atlevel lightly posterior to trans－
VerS nerVeCOmmissure．Penetrationglandsnot
WOrkedout．Oralsuckerglobular，Subterminal，
40－46long by40－52wide．Stylet elliptical，8
1ongby6－8wide，withasharp－pOintedstraight
Splne meaSur ng2－310ng onits anterior tip．
Prepharynxsh t，8－10long．Pharynxelliptical，
16－20long by　20－22　wide．Esophaguslong，
∴l／／日日川√／／／／川＃りJり／ 61
Figs．5－7．Alloc777adiumgotoi．5：Cercariaobtainedfrommsidium nikkoense，hotformalin－fixed，1ateral
view．6：Bodyofcercaria，living，eXCretOrySyStemOnrightsideofbodyomitted，Ventralview．
7：SmallimmaturewormfoundinM痩u7muSanguillicaudatus，living，eXCretOrySyStemOnright
Sideofbodyomitted，Ventralview．Scalebars＝200JLm．
bifurcating anterior to ventralsucker；intesti－
nal ceca extending to near posterior end of
body．Ventralsucker globular，Slightly poste－
rior to mid－1evel of body，40－46in diameter．
Genitalprimordia elongate，median，dorsalto
ventral sucker．Excretory bladder saccular，
epithelial，just posterior to genitalprimordia，
leading posteriorlyinto a thick－Walled short
Canal；Caudalexcretorycanalnotseen；primary
excretory pore not worked out．Flame cells
presentin ventral and dorsal planes of body；
flame－Cell formula　2［（2＋3＋3）＋（3＋3＋
3）］＝34．
Discussion
Immature and mature worms of A gotoi
wereobtainedfromtheintestineofsomefishof
M．anguillicau（ねtus collectedintheriveron12
July1987，3November1989，5August1990，and
13Aug st1999（NSMT－P15216▼5219，my un－
published data，1987－1999）．No allocreadiid
SpeCies besides A．gotoi were foundin either
fishes or mphibians，all caughtin the river
（myunpublisheddata，1987－1999）．Allocreadiid
digeneans produce ophthalmoxiphidiocercous
CerCari eindaughterrediaeinpisidiidbivalves
（Yamaguti，1971）．Thepresentcercariawasof
the phthalmoxiphidiocercous type．lt had the
flame－Cel formula of2［（2＋3＋3）＋（3＋3＋
3）］＝34．Smallones of theimmature worms
foundin M．anguillicaudatus had the same
flame－Cellformula as described above（Fig．7，
myunpublisheddata，1987）．Consequently，the
present cercariaisidentified as A．gotoi
althoughthereisn tanyexperimentalevidence
for this．A naturalsecondintermediate host of
A．gotoiisnotyetknownanywhere．Thepres－
ent cercariais the first to be reported from
62 TakeshiSHIMAZU
pisidiidbivalvesinJapan．
Allocnadhtm gotoiwas foundin M．aプqguil－
licauddtus during my surveys of digeneansin
freshwater fishes at many placesin Nagano
Prefecturefrom1976to2000，aSfollows．
1）Lake Kizakiin Oomachi（Shimazu，
1988）．
2）AsmallstreamatOkada，MatsumOtO，On
3August1987（NSMT－P15222，unPublished）．
3）The smallriver at Midori，Iiyama（this
paper）．
4）Lake Suwa at Suwa on　5　0ctober
1991（NSMT－P15221，unpublished）．
5）The Furukawa Riverin Toyoda on17
June2000（NSMT－P15220，unpublished）．
Acknowledgments
工　thank　thelate Prof．Tadashige Habe，
Tokyo，foride tifyingthebivalve．
References
l）Hasegawa，T．and Ozaki，Y．（1926）：［On a
newtrematodeparasiticinMiqumus anguil・
licaudatus ］Dobutsugaku Zasshi（Zool．
Mag．），38，225－228．（InJapanese．）
2）Shimazu，T．（1988）：Trematodesofthegenus
Allocreadium（Allocreadiidae）from fresh－
waterfishesofJapan．Bull．Natn．Sci．Mus・，
Tokyo，Ser．A，14，1－21．
3）Yamaguti，S．（1975）：ASynopticalReviewof
Lif  Histories of Digenetic Trematodes of
Vertebrates．1Xiii＋590pp．，219pls．Keigaku
Publishing，Tokyo．


長野県におけるAllocreadium gotoi (Digenea: Allocreadiidae)の生活史と地理的分布

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長野県におけるAllocreadium gotoi (Digenea: Allocreadiidae)の生活史と地理的分布

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