Bu11，Toyama

Pref， Fish， Res. lnst. N0.11， 61−66（1999）

Occurrenceof 7)eres

Takao｢1α哨/琲四必/es(Annelida: HARMELIN，Polychaeta)
Capitellidaein
ToyamaBay， Central Japan.

WATANABElandKeiichi SHOUZEN2

Abstract

Specimensof the capitemd

from Toyama

polychaete，Peres泌ZZαcZymeno｢es，are co1‑1ected

Bay， Centra1 Japan. The body is slender and cylindri‑calwith 12 thoradc

segments. The prostomium

pairs of eyespots.The
are somewhat

is distallypointed with O to3

dorsal surfaces of the firstand part of the secondsegment
flattened.The firstthree setigers have limbate capi1‑1ary

next

8 setigers havepseudocrochets

are of two types. The sampling depth ranged

andthesetae.The

abdominaluncini

from 42 to 125 m. Thesedimenttype is a silt‑day sand with a silt‑day content of 22.7‑66.8％.Thepolychaete
described in this brief paper may

represent a new record of thespecies

in Japan.
Key

Words:

Benthicpolychaetes， Capitellidae，PerejdZαcZy瓜Ｇｌｏ｢ｅｓ，ＴｏｙａｍａＢａｙ
There

are twoknown

described

spedesbyof the genus

Harmelin？eres泌ZZa: one（1968）andfromlreland

describedby Dinneen（1982），and a second

TulearareaofMadagascar

describedbypreviouly

fromhasbysurvey
andTablenot beenreported

the Toyama

PrefeduralFisheries

on the east side of Toyama
1）.Toyama

Baystations are locatedis known

in an area

Genus

Bay

fromKinsale

the Mediterranean

Harbouron the south

Rdymen｢descoastof

species に）．ａｃひｍ決心ｏわrac垣dafromtheThomassin
Japan.
Reseach（1970）.However，aspecies

The

here

samplesreported

lnstitute duringin May， August

andofPeresiellawerecollected

a macrobenthosfauna

Octoberof 1997 （Fig.1

as a steep sloping bay （Fujii，1985），and the sam‑plingwiththat sloping

tendency，Peres泌ZZαHarmelin，1968？eres泌ZZa cらﾉ瓜eno｢es HARMELIN， 1968

(Figs.1‑9)

Peres泌ZZαcZyme乃o｢esHARMELIN， 1968，pp.257‑259，figs，1‑9;Dinneen， 1982，pp.471‑475，fig.1

A‑G.
1
2

Takao WATANABE: Marine Biologica1 Research lnstitute of Japan Co･，Ltd.，4‑3‑16 Yutaka‑cho，Shinagawa‑ku，Tokyo 142‑0042，Japan
Keiichi SHOUZEN:
ToyamaPrefectura1 Fisheries Research lnstitute，364 Takatsuka， Namerikawa，Toyama

936‑8536，Japan

富山県水産試験場研究報告

62Ｔ第11号（1999）／ｙ 仁ｊＳｊダどうｄ ｍ一一ｋトｒＩ！ＩＩｌｔｉ冪0: ｈＳ（Himlｄ 汀t（ａｌｎｚｕ

Ｆ汝.1.

Mapof Toyama

Ｒｊｖ

Bay， showing

collecting sites of Peres泌ZZa c抄訳ぴ1o｢es１ １ｔ ・︱ＮWAT
ANABE，SHOUZEN:OccurrenceofPeresiellaclymenoidesinToyamaBay63Table1.Stationdat
afromthesurveysofToyamaBayu
ndertakenin1997.
StationLocalityStn.1Stn.7
Stn.
1013Stn.
14Stn.
15Stn.

3
6 52.
4
7'N，137 24.
67'E6.
75'
N，13
7 26.
56'
E
3
6 57.
5
5'
N，13
7 2
8.
4
7'E
3
6 5
3
6 58.
8
2'
N，13
7 31.6
0'E
3
6 5
9.
0
4'N，13
7 3
3.
37'E
3
6 5
9.
42'N，137 3
6.
42'E
000000000000Depth(m)5612542989775Materialexamined: Stn.7(1 specimen)，Stn.10(14)，Stn.14(22)coll. May 1
997;Stn.1(18)，Stn.7(11)，Stn.10(12)，Stn.13(1)， Stn.15(4)coll. August 1
997; and Stn. 1(27)，
Stn.10(2)coll. October 1
997.

DescriptionAllindividual
sareincomplete，lackingtheposteriorend.Thebodyi
sslende
randc
ylin
‑

42m mwidea
tthirdsetigerou
sseg‑dr
ical:thelar
ges
tonei
s1
6m mlongandmeasured0.
mentand approximately 3m m int
hor
aciclength.
Thethorax con
sistsofan achaetusperistomium and 1
1setigerou
s segments (Fig.2A).
Theprostomium i
spointed with0to 3pair
sofeyespots. The peristomium isflattenedonthedor
salsurfacel
ikeMaldanids (Fig.2A). Thefirstthr
eesetigerou
s segments havelimbate capillarysetae(Fig. 2C) w
it
houtt
hefir
stneu
rose
tae.Thefollow
ing8setigeroussegments have pse吋 ocrochetseach withparapodia (Fig. 2D，E).
Abdominals
etaeareo
ftwo types: onetypei
sahoodedhookwhichhasa broads
hou
l‑
derbu
ti
spr
esen
tonlyont
he1
2t
hand1
3t
hneuropodia.Theothertypeofsetaehasnor‑malhoodedhooksoneachparapodia. Bothtype
sofhoodedhooks havet
inyt
eet
hon t
he
to
pend (Fig. 2F，G).
stheseindiv
idu‑
Thebodyhasno branchiaonanyo
fthe2
4abdominalsegments，andaalsare incomplete，thefollowing abdominalsegments and pygidium are notobserved.

Remarks
Allindiv
idualsofP. clymenoides from Toyama Bay are more slender:their width atthethir
dsetigerou
s segment ranges from 0.
28‑
0.
42m m，compared with 0.
41‑
0.
67mmforindiv
iduals from Kinsale Harbour (Dinneen， 1982) and 0.
400.
55 m m from the・Mediterranean (Harmelin，1968).

W

富山県水産試験場研究報告

64Ｆ第11号（1999）

Ｌ１︲ ＥｐＡＣ ａＯｌ ｊｔ ｔt（Ｆ 可︱ＣＢ

Ｎ ｃ

２ ｎ

Ｃ Ｃ ＵＦＧｌｍｍ
Ａ
４「Ｄ0.5mm11 ｈＢ）陣ｍ

Ｃ，Ｄ，Ｅ，Ｆ，Ｇ

F汝．２．

？匹es泌ZZa
cZymenoracic

limbatepseudocrochet;hook｢esHARMELIN.

capillary

seta;

A，B:
D:

anterior ends of the body，1ateral view; C: tho‑thoracic

F: specialised neuroseta

frompseudocrochet;E:

brokenthoracic12th setigerous

segment;

G:

abdominal

hooded.
４

WATANABE，SHOUZENThe number: Occurrence of 抑r･d旨唐心匹o渋sin Toyama

of eye spots is variant，viz: O‑3 pairs in Toyama

65

BayBay， 3‑4 pairs in KinsaleHarbour（Dinnee

5‑8 pairs in the Mediterranean （Harmelin，1968）.variationin
eyespot number

is commonworms
Two

also in otherpolychaete

fixed by formalin or alcohol.

nuchalorgans

fromToyama

extendedin not only capitemds（Dinneen，1982），but

describedby Harmelin（1968）areBay. This organ

prostorium， andDinneen（1982）described

may

may

be whythe shapeextends to the second segment

not observed in the specimensconeded

be indistinct in normal
Dinneen（1982）doesof thehead regionasnotaindividuals withoutan
refer

nattened

which explains the difference between

described by Harmelin （1968）.lndividuals from Toyama

Baytoanucha10rgan.

dorsalsurfacethat

the present andthat

are similar to someex‑tent

as those of Kinsale Harbour.
Pseudocrochetscovered

the long reverse triangular hood of j），c妙malo

the shapeof the hoodinindividuals

from｢esdescribed byHarmelin（1968

KinsaleHarbourandToyama

Bay is like that of a balloon.
Habitat
Sampling

depth

ranged

from

5to25

42125minToyamaMediterranean

andc6ﾉme尽oin Kinsale｢esToyama

Bayindividuals（18‑27capitemds

aretoHarbourmin

KinsaleBay.Theis a silt‑day

the silt‑day content ranged

inds./0.1

non‑selective｢）haddeposit

asilt‑day

Harbour，6sedimentsand， withfromtotype
an36mintheoccupied

byR

averagesilt‑clay content

22.7 to 66.8％，Stationscontentof45.8

tooccupied･（血s dependsbymany

60.8％.A11feeders （Fauchald＆Jumars，1979）.Thus，itthat the distribution of P. c砂me尽

of28％.ln

on high silt‑day

may

beconsidered

content ratherthan

depth.

Acknowledgments
Weexpress

our thanksof Toyama

sampleto the following individuals: all crewPrefeduralcollection､and Dr. Minoru

of the research

Fisheries Research lnstitute that had

IMAJIMA

vesse1

Tateyamamaru

cooperatedin

for revisions of an earlier draft andforhis

useful suggestion.

要
日本で未記録種のj=）eres｢Za c砂ｍａ

約･ゐs（イトゴカイ科，多毛綱）が富山湾黒束海域の水深42〜125mから発見さ‑W

66

富山県水産試験場研究報告第ｎ号（1999）

もある.P.c6nao ｢esはその頭部の形態に特徴があり，タケフシゴカイ科に似て頭部背面に平らな面をもつことにより他のイトゴカイ科から容易に区別することができる.
References
Dinneen，P.(1982)，？eres泌ZZalrelandFauchald，andGreatK･， ＆P.

cZymenoBritain.

A， Jumars｢esHarmelin，(1979)，The

Dietofuniversity
trois

M6diterran6e，avec
End.43:

description

Madagascar).Ⅲ.Sur

EmdバHors

newtoof Worms:

Astudyof polychaete

feedingd'unJapanesePress(inlslands，Chap。25

ToyamaBay]:Japanese)，

Capitemdae(Ann61ides
nouveaugenre:｜Harmeli

Polych6tes)r6colt6s

en？eres泌ZZα.Rec.Trav.Stn.mar.

253‑259.

Thomassin，B.(1970)，Contribution
depolychaete

193‑284.

Fujii，S.(1985)，CoastaloceanographyTokaia capitemd

lr.Nat.J.20(11):471‑475.

guilds.0ceanogr.Mar.Biol.Ann.Rev.17:

Geology.981‑989

1968;

a 1'etude
lesCapitemdae

desPolychetes
dessablesde lacoramens.

regionRecduTulear

Trav.

(SWSt.mar，s6rie，supp1.10):71‑101.

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