Micropora finisterrae sp. n. a new bryozoan species from the Magellan Strait, Chile

4 Pages·1994·1.3 MB·English

Bol.Soc.Biol.Concepción.Chile.Tomo65.pp. 187-190. 1994.
MICROPORA FINISTERRAESP. N.ANEWBRYOZOAN SPECIES
FROMTHEMAGELLAN STRAIT, CHILE
Microporafinisterrae n. sp. unanuevaespeciedebriozoo
delEstrechodeMagallanes, Chile
HUGO MOYANO
I. G.'
AnewspeciesofthebryozoanañascanfamilyMicroporidae. Seproponeydescribeunanuevaespeciedebriozoodela
Microporafinisterrae n. sp., from saraples coUected in the familiaMicroporidae:Microporafmisterraesp.n.,apartirde
WesternpartoftheMagellanStraitisproposedanddescribed. muestrasrecolectadasenlaparteoccidentaldelEstrechode
Inhaving8-10opesiulesitissimultaneouslydifferentfromall Magallanes.Alpresentar8-10opesíulasdifieredetodaslas
known South American Micropora species and akin toM. especiessudamericanasconocidasdelgéneroMicropora,pero
variperforatafromNewZealandbutlackingtheaviculariathe seacercaaM.variperforatadeNuevaZelandia,delaquese
latterdoeshave. diferenciaporcarecerdelasaviculariasqueéstaposee.
KEYWORDS:Systematics.Bryozoa,FamilyMicroporidae.
Newspecies.SouthEasternPacific.
INTRODUCTION Hayward 1994). One of the unsuspectedly rich
añascancheilostomestockisthecoilosteganfamily
Inrecentyearsmanynewtaxaincludingfamilies, Microporidae.Inthesubantarcticmagellanicregión,
generaandspeciesfromantarcticandsubantarctic thisfamilyincludestheendemicgeneraAndreella
regionshavebeendescribed.Thesehaveshownthe Jullien, 1888andFlustraporaMoyano, 1970;the
existenceofamorediverseandendemicbryozoan australamphipacificOpaeophoraBrown,1948and
faunathaneverrealized(Hasting 1943;Hayward theso-calledcosmopolitanMicroporaGray,1848.
1991, 1992, 1993,Hayward&RyIand1991, 1993; Thesehavebeenrecentlyreviewedinzoogeogra-
Hayward & Winston 1994; Hondt 1979; López- phical, taxonomic and primary evolutive terms
Gappa& Lichtschein 1988; Moyano 1979, 1982, (Moyano, 1994).
1983, 1985, 1991, 1992;Rogick 1965;Winston& Microporabrevissimawasthefirstspeciestobe
'DepartamentodeZoología.UniversidaddeConcepción.Casilla2407,Concepción.CHILE
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Bol.Soc.Biol.Concepción,Chile.Tomo65,1994
describedbyWatersin1904fromantarcticwaters. Gymnocystproximallydeveloped,occasionallywith
This and subsequent authors considered that oneortwolowirregularlyround-triangular tuber-
magellanic and antarctic microporan specimens cles, Ovicellproportionally largeca. onethirdof
werethesamespeciesuntilrecentyears.Neverthe- thezoeciallength,modératebulging,smooth,with
less Hayward & Ryland, 1993 described the anirregulartriangularfronto-proximal shieldnot
magellanic populations as pertaining to a new always clearly marked. Avicularia seemingly
species:Microporanotialis.Thus,before1993two wanting,transformedinaninterzooidalkenozooid
vicariantMícroporaspecieswerethoughttoinhabit distaltoanoralapertureorasanirregularproximal
cold waters on both sides ofthe Drake Passage. zooidalscar.
However, severa! new Micropora species were
discovered during the coUecting activities ofthe Ethymology:speciesñame,fromthelatinwords
"ItalianMagellanoIExpedition"totheMagellan finis and térra meaning land's end, alludes the
Strait. Two of them M. karukinkaensis and M. southemmostpartoftheSouthAmericancontinent.
selknamihave been recently described (Moyano,
1994)andanewoneyetundescribedistheaimof Types: Holotype UCCC 23143, western
thiswork. entrancetotheMagellanstrait,100mdepth.Paratype
UCCC 23144, western entrance to the Magellan
strait, 100mdepth.
MATERIALSANDMETHODS
The material for the description of the new *Measurementsinmm(N=20) Min Max
specieswascollectedintheMagellanStraitduring Zooeciallength 0,450 0,650 0,530 0,059
the first Italian Magellanic Expedition (FIME), Zooecialwidth 0,250 0,475 0,330 0,063
February-March 1991 fromthestation: Oralaperturelength 0.050 0.075 0,061 0.006
58,5F'I5MW.E1,23/02/91;lOOmdepth,52°45,7'S;74° OOvriaclealplelretnugrtehwidth 00,,117050 00,,125500 00,,211230 00,,001264
Ovicellwidth 0,175 0,250 0,206 0,021
Photographsillustratingthetaxonomicdescrip-
tionwereobtainedatUniversidaddeConcepción *allmeasurementsfromovicellatedzooids.
Electronic Microscopy Laboratory following the
standard techniques for coating and mounting Remarks: The new species differs from all
bryozoansamplesforSEMphotography. other Southamericans species of the genus
Typematerialisdepositedinbryozoancollec- Microporainthelargenumberofopesiularholes
tionsattheMuseoZoológicodelaUniversidadde piercingthecryptocyst.Itmightbeconfusedonly
Concepción(UCCC).Chile. with Opaeophora lepida from the eastern and
westernsouthPacific,whichhasasimilarnumber
ofopesiules, butthis species shows insteadlarge
SYSTEMATICDESCRIPTION interzooidalaviculariahavinglinguiformasymme-
tricmandibules.M.finisterraesp.n.isakintoM.
Microporafinisterraesp.n. variperforata Waters from New Zealand South
Islandwithwhichitshares:a)asimilarnumberof
Pl. l,figs.A-F opesiulesandb)absenceoforalspines;yetitdiffers
fromitinthewelldevelopedandcommonavicularia
Diagnosis: Encrusting unilaminar, multiserial presentintheformerandapparentíyabsentinthe
Microporaformingwhitesheetsonsolidsubstrates latter.M.finisterraealsoresemblestoMicropora
includinglargesmittinidcolonies.Zooidsverywell gracilis(Uttley)inhavingmanyopesiules,butthis
calcified, hexagonal, with elevated blunt wide specieshasinsteadmanyaviculariawithoutacom-
borders encircling a slightly convex granulated pletecross-bar.
cryptocyst irregularly pierced by pores centrally Thenewspecieshasthesignificanceofavicariant
andproximallysituated;with8-10lateralopesiules formlinkingboththeeastemandwestemsouthPacific
formingonecircle,(occasionallyduplicatedintwo andcontributestoincreasethelargeamountofmarine
circles);thesecondpairirregularlycrescentic;oral animáis that zoogeographically characterize the
aperturesemicircular,widerthanlongwithanearly southemseasbetweenAntárctica,SouthAmericaand
straightproximalrim,apparentíylackingoralspines. theNewZealand-Australianrealm.
188
Bol.Soc.Biol.Concepción.Chile.Tomo65. 1994
mal
PLATEI.Microporafmisterraen.sp.
Topleft:Generalviewofacolonyshowingreproductiveandnonreproductivezooids.Noicilicpioximalknobsinsome.x48.
Topright:Ovicellatedzooidswithoneortwosetsofopesiules.x72.
Middieleft. Ovicellated zooids.The central-leftzooidin the bottom, shows anapparentlyregeneratedproximal zooidanda
kenozooidalinfillingoftheprimitiveaperture.Thecentral-leftzooidinthetop,hasalongproximalgymnocystx96.
Middieright:Distaltothecentralinmaturezooidthereisakenozooidintheplacewherenormallyanaviculariumdevelops.x96.
Bottomleft:Inmaturezooidshowingtheopesiularapparatus,thecentralporespiercingthecrystocystandaproximalirregularscar
insteadofanavicularium.x 180.
Bottomright:Detalloftheproximalkenozooidalscar.x360.
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Bol.Soc.Biol.Concepción,Chile,Tomo65,1994
ACKNOWLEDGEMENTS Italiantartide that sponsored the expedition
"MagellanoI"andallowedtheauthortogetthe
TheauthorisdeeplyendebtedtoDirecciónde samples for describing the new species, and to
Investigación,UniversidaddeConcepción,Chi- JuliaCáceres,agradúatestudentofUniversidad
le, for funding part of this research (Grant de Concepción, Chile, who sorted the samples
113.38.32-1); to the Italian Research Program studied.
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