Nicomache ohtai, new species (Polychaeta: Maldinidae) collected from the Hatsushima cold-seep in Sagami Bay

7 Pages·1991·2.7 MB·English

PROC. BIOL. SOC. WASH.
104(1), 1991, pp. 159-165
NICOMACHE OHTAI, NEW SPECIES
(POLYCHAETA: MALDANIDAE) COLLECTED FROM THE
HATSUSHIMA COLD-SEEP IN SAGAMI BAY
Tomoyuki Miura and Jun Hashimoto
—A
Abstract. newmaldanidpolychaetespecies,Nicomacheohtai, isdescribed
from the Hatsushima cold-seep in Sagami Bay at a depth of 1 163 m. The new
species is very close to N. venticola from the hydrothermal vents ofthe north-
eastern Pacific, however it differs from the latter in having up to 19 rostrate
uncini with 3-4 apical teeth in each neuropodium instead ofup to 10 uncini
with 2-3 teeth.
Studies on Japanese cold-seeps began as this study, a new species ofthe genus M-
a French-Japanese cooperative project us- comache is described based on intact spec-
ing the French deep-sea submersible Nau- imens ofsome mature males and females.
tilein 1984 andwere followed by multidis- The types are deposited in the National
ciplinary surveys using the Japanese Science Museum, Tokyo (NSMT), the Ja-
submersible Shinkai 2000 (Laubier et al. panMarineScienceandTechnologyCenter
1986, Miura 1988a). The collections from (JAMSTEC), and the National Museum of
these programs have provided some inter- Natural History, Smithsonian Institution
esting materials for polychaete taxonomy. (USNM).
To date, all of the polychaetes that have
been described are directly associated with
Genus Mcomac/z^ Malmgren, 1865
alargerhost species atthe seep sites (Miura
1988b;Miura&Laubier 1989, 1990).These Nicomache ohtai, new species
Figs. 1-3
associations include Protomystides hatsu-
shimaensisattached to the openings ofves- Materialexamined.—WesternNorth Pa-
timentiferan tubes and species ofthe Nau- cific, cold-seep communities off Hatsushi-
tiliniellidae living in the mantle cavities of ma,SagamiBay,Japan.DSRVShinkai2000
bivalve mollusks. Free-living polychaetes Dive 450, 21 Oct 1989, 35°00.0'N,
havenotbeenreportedfromtheseJapanese 139°13.5'E, 1163 m, collector J. Hashi-
cold-seeps. However the second author did moto, holotype (NSMT-Pol. H-326), 3
collect maldanid polychaetes within tubes paratypes (USNM 127962), 4 paratypes
thatwere attachedto a dead shell ofCalyp- (JAMSTEC); Dive 451, 22 Oct 1989, same
m
togena soyoae at 1 163 offHatsushima. site, collectorK. Fujikura, 1 paratype(JAM-
Early important studies on the family STEC); unmanned submersible D3K, Dive
MaldanidaeweremadebyArwidsson(1907, at Okinoyama Seep, Sagami Bay, 19 May
1911a, 1911b). Imajima & Shiraki (1982) 1989, 34°58.2'N, 139°31.4'E, 1116 m, 2
reviewedallJapanesemaldanidpolychaetes paratypes (JAMSTEC).
and reported 37 species including four spe- Description. —Complete paratypes 64-
mm mm
cies ofthe genus Nicomache. Intact speci- 151 long, 1.7-2.8 wide, with 31-
mm
mens are required for the identification of 35setigers(Table 1). Holotype 187 long,
mm
maldanids because of the morphological 3.5 wide including parapodia, with 32
importance ofthe posteriorbody region. In setigers; with a single achaetous preanal
1
160 PROCEEDINGSOFTHEBIOLOGICALSOCIETY OFWASHINGTON
Table 1.—Measurementoftype specimensofNicomacheohtai, new species.
Numberofsetigers Numberofanal
Specimennumber (achaetousrings) papillae Bodylength(mm) Bodywidth(mm)
Dive 450
1 (Holotype) 32(+1) 22 187 3.5 female
2 32(+1) 23 125 2.8 female
3 32(+1) 18 120 2.4 ?
4 32(+1) 25 110 2.2 male
5 32(+2) 24 151 2.6 male
6 35 (+0) 20 130 2.3 ?
7 31 (+1) 18 139 2.5 ?
8 33 (+0) 21 104 2.3 ?
Dive 45
1 31 (+1) 23 93 2.8 male
D3K
1 32(+1) 19 64 1.7 ?
2* 25+ 25 72 2.0 ?
n 10 10 10 11**
X 32.2 21.3 122.3 2.46
SD 1.1 2.5 33.5 0.47
*With regeneratedcaudal end.
"*SpecimenD3KNo. 2 included.
glandularringwellstainedbyMethylGreen. side and several subrostral fibrils (Fig. 2b).
Color in alcohol pale, with slightly dark Notopodia with stout bilimbate capillaries
brown to reddish brown swollen areas on (Fig. 2d)andshortthinspinulosecapillaries
anterior and posterior segments. (Fig. 2c) on all setigers; with spirally spi-
Prostomium broadly rounded anteriorly; nulose capillaries (Fig. 2e) and a few short
cephalic keel well defined, arched; nuchal slender wavy capillaries (V2 length ofstout
slits situated on both sides ofkeel, curved, capillaries) on median and posterior noto-
diverging anteriorly; mouth rounded, with podia (Fig. 2g).
thick lip (Fig. la, b). Tubecoveredwithcoarsesandgrainsand
Setigers 1-6 slightly longer than wide, mud.
flaring anteriorly, without collars (Fig. Ic); Variation.—T\iQ total number ofsetigers
mediansegmentsverylong,sometimesmore varies from 31 to 35 (X= 32.2) in 10 com-
than 4 times longerthan wide; posterior se- plete specimens, with 6 having 32 (Table
tigersshort,withwell-definedglandularpads 1). In an exceptional paratype (Dive 450,
(Fig. Id, e). Pygidium with dorsally short- No. 6) with 35 setigers, the last setigerous
ened anal fiinnel bearing 22 papillae (Fig. segment is merely recognized by the pres-
Id-f). enceofitsrightparapodium.Thusthenum-
Parapodia biramous; first 3 neuropodia ber is rather constant in the species.
with2-6stoutacicularspines(Fig. 2a,Table Some early authors mentioned the num-
2); fiDllowingneuropodiawith 9-12 rostrate ber ofpreanal segments (glandular pads or
unciniinanterior2 andposterior 5 setigers, rings) as an important character (e.g., Ima-
with 13-19 in middle 25 setigers (Fig. 3). jima & Shiraki 1982: the key to the species
Each uncinus with 3-4 teeth above main ofthegenusNicomache),howeverthenum-
fang, numerous accessory spines on convex berisvariable(0-2)inthisnewspecies. The
VOLUME NUMBER
104, 1 161
a,b 3mm
c-f 4mm
Fig. 1. Nicomacheohtai(Holotype):a,Anteriorend,dorsalview;b.Same,ventralview;c,Anteriorsegments,
lateralview; d. Posteriorsegments, dorsal view; e, Same, lateralview; f, Pygidium, posteriorview.
number of papillae on anal funnel ranges per parapodium in 1 1 specimens are 3.5,
from 18 to 25 (^= 21.3, « = 10), with each 4.1 and 5.2 on setigers 1, 2 and 3, respec-
papilla being very broad and sometimes tively. The number ofanterior setae seems
subdivided. to depend on the body size, however only
The number of anterior acicular spines the correlation of the number of rostrate
perparapodium ranges from 2to 7 with the uncini on parapodium 4L with the body
majorityfrom 3 to 6 (Table 2). The number width is significant {R = 0.87, P < 0.001).
increases in the three succeeding setigers. Biology.—On some posterior segments,
Forexample, theaveragenumbersofspines the spirally spinulose capillaries were cov-
162 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
Fig.2. Nicomacheohtai(Holotype):a,Acicularspineonsetiger 1;b.Rostrateuncinus;c,Spinulosecapillary;
d,Bilimbatecapillary;e.Distalendofspirallyspinulosecapillary;f,PartofsamewithBeggiatoa-likefilaments;
g. Shortwavycapillary.
ered with numerous filaments (Fig. 2f), re- lomofmid-posteriorsegments.Theoocytes
callingtheBeggiatoa-MkQbacteriafoundon are discoidal or hexagonal with the largest
somealvinellidpolychaetesoronsediments measuring about 150 t^m x 50 ixm.
of deep-sea hydrothermal vents (Desbru- Remarks.—In the genus Nicomache, 23
yeres et al. 1985, Tunnicliffe et al. 1985). nominal species are recognized (Hartman
Femalespecimenshadoocytesinthecoe- 1959, Fauchald 1977, Blake 1985, Blake &
VOLUME NUMBER
104, 1 163
•
o
•
•• ••••
13
• •
h '' • • • • • • •
• • • •
• • • •
LU • • • •
CD
• •
• •
Z •
JL ^-- > i 1 «
10 15 20 25 30
SETIGER NUMBER
Fig. 3. Distributionofrostrate uncini in the holotype ofNicomacheohtai, new species.
Hilbig 1990). Most have 23 setigers or less up to 6 acicular spines in each ofthe first 3
andareeasilydistinguishable from A^. ohtai setigers. A^. ohtai differs from A^. venticola
which has more than 30 setigers. Two spe- in having up to 19 rostrate uncini with 3-
cies have been described from deep-sea hy- 4 apical teeth in each neuropodium instead
drothermalvents:A^. arwidssoniBlake, 1985 ofup to 10 uncini with 2-3 teeth and in the
and N. venticola Blake & Hilbig, 1990. A^. presence ofthe shortwavycapillaryinstead
ohtaiis most similartoA^. venticola in hav- ofthe absence. The absence ofthe long fil-
ing30 ormoresetigers, 22 analpapillaeand amentouscapillaryinthetwohydrothermal
Table2.—Distributionofacicularspinesandrostrateuncini(parenthesizednumbers)on firstfoursetigersin
type specimensofNicomacheohtai, new species.
Setigernumber
Specimen
number 3L
Dive 450
1 2 (10) (9)
2 4 (9) (7)
3 3 (7) (6)
4 3 (7) (7)
5 3 (8) (8)
6 4 (8) (6)
7 4 (8) (10)
8 4 (7) (7)
Dive451
1 4 (7) (7)
D3K
1 4 (6) (6)
2 3 (6) (6)
n 11 11 11 11 11 11 11 11
X 3.5 3.5 4.4 3.9 5.3 5.2 7.5 7.2
SD 0.7 0.7 0.7 0.8 1.0 0.9 1.2 1.3
—
PROCEEDINGSOFTHEBIOLOGICALSOCIETY OFWASHINGTON
164
ventspecieswasconsideredasanimportant Nereididae, Glyceridae, Dorvilleidae. Orvini-
character for separating them from other idae, andMaldanidae. Pp. 67-101 in Meredith
& L.Jones,ed.,Hydrothermalventsoftheeastern
congeners (Blake 1985, Blake Hilbig
Pacific:anoverview.—BulletinoftheBiological
1990). The presence ofthe short wavy cap- Society ofWashington 6:1-566.
illary in N. ohtai is therefore thought to be & B. Hilbig. 1990. Polychaeta from the vi-
an intermediate state between these two cinity of deep-sea hydrothermal vents in the
groups ofspecies. easternPacific.II:Newspeciesandrecordsfro—m
theJuandeFucaandExplorerRidgesystems.
Nicomache mossambicaDay, 1951 isan- Pacific Science 44:219-253.
other known species with more than 30 se- Day,J. H. 1951. ThepolychaetefaunaofSouthAf-
tigers. Both A^. mossambica and A^. ohtai rica. Part 1: The intertidal and estuarine poly-
have two or more acicular spines on the chaeta ofNatal and Mocambique.—Annals of
fanutnenreiloorftthherefeorsmeetirgeisrsc,ylihnodwreicvaelrantdhedifafnearls Desbruyt1eh9re8e5Ns.a,taDP.lo,lMyFuc.hsGaeaeiutlomlu,s1L2.a:n1Ln-ae6ul7bi.idesr,fr&omY.hyFdoruoqtuheetr.-
from the dorsally shortened funnel of the mal vent ecosystems: an ecological overview.
latter. Pp. 103-116 inMeredithL. Jones, ed., Hydro-
Etymology.—The species is named in thermal vents ofthe eastern Pacific: an over-
honorofDr. S. Ohtaofthe Ocean Research view.—Bulletin of the Biological Society of
Washington 6:1-566.
Institute, University ofTokyo forhis valu- Fauchald, K. 1977. The polychaete worms. Defini-
able advice on the sampling using sub- tions and keys to the orders, families and gen-
mersibles. era.—Natural History Museum ofLos Angeles
County, Science Series 28:1-190.
Hartman, O. 1959. Catalogue of the polychaetous
Acknowledgments
annelids ofthe world. Part 2.—Allan Hancock
The authors wish to thankthe staffofthe FoundationPublications,OccasionalPaper23:
355-628.
JapanMarineScienceandTechnologyCen- Imajima, M., & Y. Shiraki. 1982. Maldanidae (An-
terfortheirassistanceinsamplingonDives nelida:Polychaeta)fromJapan.—Bulletinofthe
450 and 451 ofShinkai 2000 and a dive of NationalScience Museum, Tokyo 8A:7-88.
the unmanned submersible D3K. The Laubier,L., S.Ohta,&M. Sibuet. 1986. Decouverte
manuscript benefited from the careful re- dceamcpoamgmnuenfaruatnecos-jaanpiomnaaliesseKprAoIfoKnOdedsedpulroanngteelsa
view by Dr. James A. Blake, Science Ap-
dans les fosses de subduction autour du Ja-
plication InternationalCorporation. Partof pon.—ComptesRendusde1'AcademicdesSci-
this study was supported by a grant-in-aid ences, Paris, Serie III 303:25-29.
from Itoh Science Foundation. Malmgren, A. J. 1865. Nordiska Hafs-Annulater.
Ofversigt af Kongl Vetenskaps-Akademiens
Forhandlingar 21:51-110 & 181-192, 8 pis.
Literature Cited Miura,T. 1988a. ParasiticanimalscollectedinaCa-
lyptogena-dominantcommunitydevelopingoff
Arwidsson, I. 1907. Studien iiber die skandinavis- Hatsushima, Sagami Bay.—Japan Marine Sci-
chen und arkischen Maldaniden nebst Zusam- enceandTechnologyCenter,TechnicalReports
menstellung der iibrigen bischer Arten dieser 4:239-244 (inJapanese).
Familie.—ZoologischeJahrbiicher,Supplement . 1988b. A new species ofthe genus Proto-
9:1-308, 12, pis. mystides(Annelida,Polychaeta)associatedwith
. 1911a. On some Irish Maldanidae.—Pro- a vestimentiferan worm from the Hatsushima
ceedingsoftheRoyalIrishAcademy 29B:209- cold-seepsite.—ProceedingsoftheJapaneseSo-
228, 3 pis. cietyofSystematicZoology 38:10-14.
. 1911b. DieMaldaniden.—Wissenschaftliche & L. Laubier. 1989. Nautilina calyptogeni-
Ergebnisse der Schwedischen Siidpolar-Expe- cola, anewgenusandspeciesofparasiticpoly-
dition 1901-1903 6(6):1-44, 2 pis. chaete on a vesicomyid bivalve from Japan
Blake, J. A. 1985. Polychaeta from the vicinity of Trench, representative ofa new family Nautil-
deep-seageothermalventsintheeasternPacific. inidae.—Zoological Science 6:387-390.
&
I: Euphrosinidae, Phyllodocidae, Hesionidae, . 1990. Nautiliniellid polychaetes
VOLUME NUMBER
104, 1 165
collectedfromtheHatsushimacold-seepsitein (TM) Faculty of Fisheries, Kagoshima
Sagami Bay, with descriptions of new genera University, 4-50-20 Shimoarata, Kagoshi-
TunnicliafnTde,sVp.e,ciS.esK..—JZuonoilpoegri,ca&lMS.ciEe.ncdeeB7u:r3g1h9.-32159.85. ma 890; (JH) Japan Marine Science and
The hydrothermal vent community on axial Technology Center, 2-15 Natsushima-cho,
seamount,JuandeFucaRidge. Pp. 453-464 in Yokosuka 237, Japan.
Meredith L. Jones, ed., Hydrothermal vents of
the eastern Pacific: an overview.—Bulletin of
theBiological SocietyofWashington 6:1-566.