New species of Brucerolis (Crustacea: Isopoda: Serolidae) from seas around New Zealand and Australia

2009·15.6 MB·

by  Melissa J Storey

MemoirsofMuseumVictoria66: 147-173(2009)
ISSN 1447-2546(Print) 1447-2554(On-line)
http://museumvictoria.com.au/About/Books-and-Journals/Journals/Memoirs-of-Museum-Victoria
New species ofBrucerolis (Crustacea: IsopodrfS’ erolidae) from seas around New
X
ealand and Australia
MelissaJ. Storey1’2and Gary C.B. Poore1
1MuseumVictoria,GPOBox666E,Melbourne,Vic.3001,Australia([email protected])
2 Zoology Department, The University of Melbourne, Vic. 3010, Australia (present address: CSIRO Publishing,
Collingwood,Vic.3066,Australia)([email protected])
Abstract Storey,M.J.,andPoore,G.C.B.2009.NewspeciesofBrucerolis(Crustacea:Isopoda: Serolidae)fromseasaroundNew
ZealandandAustralia.MemoirsofMuseumVictoria66: 147-173.
FivenewspeciesofBrucerolisPooreandStorey,2009aredescribed,fourfromdeepwatersoffNewZealandand
onefromsouth-easternAustralia.Thisdoublesthenumberofspeciesinthegenus.Sevenspeciesarenowknownfromthe
Tasman Seaand eastern NewZealand, andthreefromwithin orcloseto the Southern Ocean.Akey to all species is
presented.
Keywords Crustacea,Isopoda,Serolidae,Brucerolis,taxonomy.NewZealand,Australia,newspecies
Introduction species here. Surveys of the epibenthic macrofauna on the
ChathamRise,NewZealand,indicatedthreecommunities,the
Poore and Storey (2009) erected the genus Brucerolis to
shallowest of which at 237-602 metres and predominantly
distinguish agroup offive species ofserolidisopodsthathad
previously been confused with Acutiserolis Brandt, 1988 by sandy sediments is characterised by crustaceans, including
isopodworkerswhoadoptedBrandt’s(1988and1991)revision “Serolis bromleyana” (McKnight and Probert, 1997). Hurley
(e.g., Wagele, 1994; Poore and Brandt, 1997; Held, 2000). wasnotthefirstauthortohavecommentedonthemorphological
BrucerolisdiffersfromAcutiserolisinhavingthecoxaldorsal variabilityofspecimenssimilartoSerolisbromleyana.Beddard
plates 2-6 interacting only by means ofkey-like lobes, coxal (1884a: pi. 4 figs 3, 6) illustrated a male from New Zealand
plate 6 exceeding the pleotelson by at least the pleotelson that, he noted, differed from syntypes ofS. bromleyana from
length, middorsal spines being absent or obscure, and the theIndianOceansectoroftheSouthernOceanintheshapeand
pleotelson lacking ridges and keels. The type species, lengthofcoxa6,acuteratherthanemarginateepimeronapices,
Brucerolis nowra Poore and Storey, 2009 is from the less pronounced marginal and transverse ridges and lack of
continental margin of eastern Australia but is not the only anteriorspine onpereonite 1 andthepresence offine setae on
speciesthere.Here,anotherisdescribedalongwithfourmore theischium,merusandcarpusofthemalepereopod2.
fromseasaroundNewZealandwheretheyhavebeencollected Poore andBrandt(1997) illustratedthe mouthparts ofthe
intheirhundreds. syntypes of Serolis bromleyana, referred the species to the
One of the species included by Poore and Storey in genusAcutiserolisandcommentedonmorphologicalvariation
Brucerolis was Serolis bromleyana Willemoes-Suhm, 1876. reportedintheliterature.They statedthatmaterialfromdeep
Hurley (1957) identified deepwater isopods collected from water off southern Australia and New Zealand contained at
CookStraitandofftheeasterncoastofNewZealandasSerolis least three undescribed species. They also reported a S.
bromleyana. Later, Hurley (1961a) reported the same species bromleyana-like specimen collected from the West Scotia
fromtheTasmanSea,butthespecimenillustratedinhisplate 1 Basin, SouthernOceanwithalong, setosepalmandproximal
(p. 226) differed from Antarctic specimens described by heel of the male pereopod 2 propodus, which they found
Beddard(1884a).Hurley(1961b)summarisedthesefindingsin clearly differentfromthe shortpalm andmedianheel ofthat
a checklist and key to New Zealand isopods. In a subsequent of the male syntype of S. bromleyana. More recently, Held
correspondencewithoneofus(lettertoGCBP, 16May 1984), (2000) mentioned the difficulty in placing material of
Hurley discussedthreeforms thathe could clearly distinguish “Acutiserolis bromleyana” fromthe Drake Passage owing to
bydepthdistributionandcolour.Thethreearedescribedasnew morphologicaldisparitywiththedescription.
148 M.J.Storey&G.C.B. Poore
In this paper, four new species are described from - Anterolateralmarginofheadtransverselyconcave,lateral
collectionsmadeoffNewZealandbytheNationalInstituteof angleonlyslightlymoreelevatedandproducedanteriorly
Water and Atmosphere, Wellington, New Zealand (NIWA) than mesial angle; male epimeron 3 barely reaching
and one from collections from south-easternAustralia made posteriormarginoftelson;uropodalendopod3.0timesas
byMuseumVictoria,Melbourne(NMV).Additionalmaterial longaswide B.howensissp. nov.
was availablefromthe SouthAustralianMuseum(SAM) and
theUS National MuseumofNatural History (USNM). A key 5. Pleonal epimeron 3 equal to (in female) or exceeding
ispresentedforall species ofBrucerolis. pleotelson;anterolateralregionofpereonite 1withnarrow
Adultmaleandovigerousfemalespecimensweredissected sharp submarginalridgeandgrooveparalleltomargin
and examined using aWild M5 dissecting microscope and an B. victoriensis sp. nov.
OlympusBX50andOlympusBH-2compoundmicroscopeand - Pleonalepimeron3notexceedingpleotelson;anterolateral
new species were drawn underNomarski illumination using a regionofpereonite 1withbroadsubmarginalpockedarea
camera lucida. Illustrations are of male left limbs unless B. cidaris(PooreandBrandt, 1997)
otherwisenotedandarelabelled:Al,A2,antenna 1 and2;MD,
MDp, mandible and palp; MX1, MX2, maxilla 1 and 2; MP, 6. Anterolateral margins of head straight-concave, lateral
maxilliped; P1-P7, pereopods 1-7; PL1-PL5, pleopods 1-5; anglewellproducedbeyondmarginofpereonite 1;width
PS, medial ridge ofpleonal stemites; S, pereonal and pleonal offront(betweenanterolateral corners) 1.6times aswide
stemitesofmale;U,uropod. Scalebarsare 10mmandreferto asmaximumspanbetweenlateralmarginsofeyes
habitusdrawingsonly.Bodylengthismeasuredfromtheanterior B. brandtaesp. nov.
margin of the head to the posterior margin of the pleotelson, - Anterolateral margins ofhead convex or straight, lateral
eofxchlouldoitnygpethmeaalnetsenannadedainfdfecroenxcaees.nDoetsecdrifpotriopnasraatryepeessfeenmtailaelsl.y angle notproduced beyond margin ofpereonite 1; width
offront(betweenanterolateralcorners)lessthan 1.3times
AmlatlerfiigaulreissdaerpeosfirtoemdtahteNmIaWlAe,uNnlMesVs oatnhderSwAisMe.indicated. Type easyeswide as maximum span between lateral margins o7f
2
erolidaeDana, 1853 7. Ventralcoxalplates2-4withtransverseridgesonmesial,
anterior and posterior margins outlining a transverse
BrucerolisPooreandStorey,2009 depression; coxal plates 6 of male parallel, of female
increasingly diverging towards tip; anterolateral corners
KeytospeciesofBrucerolisPooreancf torey,2009 ofheadcontinuouswithanteriormarginofpereonite 1
B. osheaisp. nov.
The key does not include the two South Atlantic species, B.
maryannae (Menzies, 1962) or B. macdonnellae (Menzies, - Ventral coxal plates 2-4 with a prominent tubercle at
1962), both poorly described but apparently similar to B. anteromesial corner; coxal plates 6 initially diverging
bromleyana. thenconvergingslightlytowardstip;anterolateralcorners
ofheadconvexbutnotcontinuouswithanteriormarginof
1. Anterolateral margin of pereonite 1 with acute angle,
dorsally with elongate triangular slope connecting to pereonite 1 B. hurleyisp. nov.
transverseridge
B. bromleyana(Willemoes-Suhm, 1876) Brucerolisbrandtaesp. nov.
- Anterolateral margin of pereonite 1 rounded, without Figures la,2-5
acute projection, dorsally with submarginal ridge or Materialexamined.Holotype:NewZealand,BountyPlateau,48°58'S,
elevatedareabutnotatriangularslope 2 178°02'E, 1060m,23Jan1965(NIWAstnF114),NIWA27415(adult
male,35mm).
2. Pleonal epimera2and3 withemarginatebifidapices 3 Paratypes:NewZealand,BountyPlateau,48°07'S, 174°02'E,1155
- Pleonal epimera2and3 withacuteapices 6 m,21Jan1965(NIWAstnFI10),NIWA27413(adultfemale,35mm),
NIWA27410 (1 male, 1 juvenile); 49°18.6-17.5'S, 177°54.7-55.5'E,
3. Dorsal surface ofpereonite 1 withoutan oblique sinuous 990 m, 15 Mar 1981 (NIWAstnT48), NIWA27414 (adult male, 36
ridge separated from lateral margin by shallow trough mm),NMVJ55313(8males,3females,8juveniles);48°58’S,178°02’E,
(fig- Id,f) 4 1060m,23Jan1965(NIWAstnFI14),NIWA27411(1male,1female);
48°32'S, 177°59'E, 1051 m, 27 Jan 1965 (NIWA stn F125), NIWA
- Dorsal surface of pereonite 1 with an oblique sinuous 27409(2males,2females, 1juvenile);48°30.5-32'S, 178°18-23.8'E,
ridge separated from lateral margin by shallow trough 915m,19Mar1979(NIWAstn1697),NIWA27412(8males,8females,
(fig. lh) orwithasculpturedelevatedarea(fig. lc) 5 10juveniles);48°50.6'S, 178°41.5'E,808m, 17Mar 1979(NIWAstn
4. Anterolateral margin of head obliquely concave, lateral 1689)O,thNeIrWmAate2r7i4a1l7:(n3u2memarloeuss,s1p4efceimmaelness,f2r2omju3ve7niNlIesW).Astations.
angleconsiderablymoreproducedanteriorlyandelevated
than mesial angle; male epimeron 3 well exceeding Description ofmale holotype. Body length 35 mm. Body 0.8
posteriormarginoftelson;uropodalendopod3.5timesas timesaslongasgreatestwidth(atcoxae3).Middorsallinewith
longaswide B. nowraPooreandStorey,2009 shorttriangularmiddorsalprocessesonposteriormarginofhead,
NewspeciesofBrucerolis(Crustacea: Isopoda:Serolidae)fromseasaroundNewZealandandAustralia 149
Figure1.Headandpereonite1ofspeciesofBrucerolis.a,B.brandtaesp.nov.(NMVJ55313).b,B.bromleyana(syntype,BMNH1889.4.27.20,
negativeofdrawingbyKateThompsonpublishedbyPoore&Brandt, 1997). c,B.cidaris(NMVJ27642).d,B.howensis(NMVJ55315).e,B.
hurleyi(NMVJ55314).f,B.nowra(NMVJ19213). g,B.osheai(NMVJ55316).h,B.victoriensis(NMVJ19201). Scalebarineachcase= 10
mm.
pereonites 2^4andpleonites 1-3, evidentinlateral view. Head, obliqueridgemoreorlessparalleltomargin,separatedfromitby
anterolateralmargins straight-concave,lateral comers acuteand a shallow concave trough occupying about one-third ofwidth,
projecting anteriorly; width between anterolateral comers 1.6 dorsal surface with obsolete oblique-transverse ridge reaching
timesaswideasmaximumspanbetweenlateralmarginsofeyes; sinuous ridge. Coxal dorsal plate 2 0.8 times as long as half
headwithpairedstronglyprojectingcurvingacuteprocesseson pereonaltergite 2width(following plates increasinginlength);
transverse ridge at bases ofantennae 1, with prominent paired plate4 1.9timesaslongashalfpereonaltergite4width;plate6
tubercles between eyes, with small, blunt median posterior extendingbeyondtipofpleotelsonby2.2timesmiddorsallength
tubercle,withobscurelobeslateraltomedianposteriortubercle. ofpleotelson (minimum estimate), the pair diverging and then
Pereonite1,lateralmargingentlysinuous,lateralmarginupturned convergingslightlyapically,curvingevenly;pleonalepimeron2
over anterior half, sharply crested, with sinuous low rounded 2.2 times length of pleotelson; pleonal epimeron 3 1.2 times
150 M.J.Storey&G.C.B. Poore
Figure2.Brucerolisbrandtaesp.nov.Holotypemale(NIWA27415):dorsalandlateralviews,sternitesofpereonites 1-7,pleonites 1-3,medial
ridgeofpleonites 1-3.Paratypefemale(NIWA27413): dorsalandlateralviews,medialridgeofpleonites 1-3.Paratypemale(NIWA27414):
uropod.Scale=10mm.
NewspeciesofBrucerolis(Crustacea: Isopoda:Serolidae)fromseasaround NewZealandandAustralia 151
Figure3.Brucerolisbrandtaesp.nov.Holotypemale(NIWA27415):antenna1,mandibularincisors,palp,maxillae1,2,maxilliped.Paratype
male(NIWA27414):antenna2.
lengthofpleotelson;pleonal epimera2and3 withacuteapices. sharply angled atfreeproximal margin, with 20 robustsetae in
Ventralcoxalplates2^4withtransverseridgesonmesial,anterior U-shaped row. Pereopod 7 carpus 5 times as long as greatest
andposteriormarginsoutliningatransversedepression.Antenna width; propodus 4.5 times as long as greatest width, propodus
1 peduncle articles 3+4 2 times as long as article 2 (anterior taperingfromnearbase,lowermarginstraight;dactyluscurved,
margin); flagellum of about 42 articles. Antenna 2 peduncle 0.45timesaslongaspropodus.Pleopod2endopodwithconvex
article 5 1.4times as long as article 4; flagellum of 18 articles. distal margin, sharply tapering to base of appendix masculina;
Pereopod 1 propodus 2.2 times as long as greatest width. appendix masculina 3.8 times as long as straight margin of
Pereopod2palmdorsallength 1.8timesgreatestwidth,straight, endopod.Uropodalexopod0.85lengthofendopod.
152 M.J.Storey&G.C.B. Poore
Figure4.Brucerolisbrandtaesp.nov.Holotypemale(NIWA27415):pereopods 1-5.Paratypefemale(NIWA27413):pereopod2.
NewspeciesofBrucerolis(Crustacea: Isopoda:Serolidae)fromseasaround NewZealandandAustralia 153
Figure5.Brucerolisbrandtaesp. nov.Holotypemale(NIWA27415): pereopods6,7,pleopods 1-5.Paratypemale(NIWA27414): pleopod2
endopodandappendixmasculina.
154 M.J.Storey&G.C.B. Poore
Female. Pereonite 1, lateral margin of female convex pleotelson and also differs from B. bromleyana by the acute
anteriorly, with distinct step-like interruption and straight tipsofepimera2and3.
posteriorly. Coxaldorsalplate2offemale0.8timesaslongas Poore and Brandt (1997: 15, fig. 3) illustrated a male of
half pereonal tergite 2 width; plate 4 of female 1.4 times as “Acutiserolissp.”thatshareswiththesethreespeciesanacute
long as half pereonal tergite 4 width (following plates projection onthe margin ofpereonite 1. It differed in amore
increasinginlength);plate6offemaleextendingbeyondtipof erect submarginal ridge and more elongate propodus on
pleotelsonby2timesmiddorsallengthofpleotelson(ormore), pereopod2 andmaywell representanothersimilarspecies of
thepairdivergingoverentirelength,curvingevenly. BrucerolisclosetoorintheSouthernOcean.
Size. Malelength: 24-40mm,femalelength: 27-35mm.
Distribution. New Zealand, eastern slope, Chatham Rise, Bruceroliscidaris(PooreandBrandt, 1997)
Bounty Plateau, northern Campbell Plateau, 39°S-51°S, Figure lc
167°E-179°W, 494-1500 m. One record NE ofNorth Island,
2500m,andonerecordWofSouthIsland. ABcruutciesreorloilsiscicdiadrairsi.s—PooProeoraenadnBdraSntdorte,y,1929070:9:15175-21-6105,3.figs.4-6.
Etymology. Brucerolis brandtae is named for Professor Distribution. Coral Sea, Australia, near Townsville and
Angelika Brandt, who studied the phylogeny of serolids and Chesterfield Islands, 17o12.15'S-2TT5.01'S,
describednewserolidgeneraandspecies. 147°10.80'E-157°51.33'E,891-1491 m.
Rmemmarks.Thelargesizeofmalesandfemales(upto40and35 Remarks. Brucerolis cidaris is diagnosed by its small size,
respectively) of Brucerolis brandtae and the wide emarginate tips of epimera 2 and 3 and pock-marked
anterolateral head lobes with a straight or convex anterior anterolateral region ofpereonite 1. Brucerolis hurleyi and B.
margin are useful charactersforidentifyingthis species. Like osheaiaresimilartoB.cidarisbutbothhaveacoveringoflong
B. hurleyi and B. osheai, the anteriortransverse ridge on the setules onthe lowermargin ofthe male pereopod 2, a dorsal
head ofB. brandtae has a strongly acute, posteriorly curved curved acute process on the anterior margin ofthe head and
dorsal projection immediately adjacent to the insertion of acutetipsofepimera2and3.
antenna 1 onbothsides.
Brucerolishowensissp.nov.
Brucerolisbromleyana(Willemoes-Suhm, 1876)
Figures Id,6-9
Figure lb
— Material examined. Holotype: Tasman Sea, Lord Howe Rise,
Serolis br-omleyana Willemoes-Suhm, 1876: 591. Beddard, 34°59.3'S, 162°11.28'E, 1573m,26Sep 1982(NIWAstnU198SEB),
1884b: 331. Beddard, 1884a: 53-57, pi. 4 (except figs. 3, 6). NIWA27431 (adultmale,29mm).
-Sheppard, 1933: 280,329-330—. — Paratypes: collected with holotype, NIWA 27428 (adult female,
1991A:cu1t31i.se-rolPiosorberoamnldeyBarannad.t, 199B7r:an1d—5t3,-115968,8:fig1s7.,1-212.. Brandt, j2u7vemnmil)e,s)N,INWMAV2J75452381(5ad(u1ltmamlael,e,12f9emmalme)),;NTaIsWmAan27Se4a2,7L(o2rmdalHeos,we7
Serolis(Acutiserolis)bromleyana. Wagele, 1994:53. Rise,31°34.0'S, 159°26.5'E, 1828-1808m, 08May 1979 (NIWAstn
Not Serolis brom—leyana.— Beddard, 1884a: pi. 4, figs. 3,—6 1722),NIWA27428(1male, 1female).
(identity uncertain). Hurley, 1957: 13 (id-entity uncertain). Othermaterial: Tasman Sea, S ofLord Howe Plateau, 37°00’S,
Hurley, 1961a: 228-229,—pi. 1 (?=B. hurleyi). Hurley, 1961b: 269, 170°00'E,2096m, 18Apr1970(NZ0IstnJ39),NIWA(1female).
285(identityuncertain). McKnightandProbert,1997:508(identity
uncertain). Description ofmale holotype. Body length 29 mm. Body 1.1
—
Not Acutiserolis bromleyana. Held, 2000: 167 (identity times as long as greatest width (at coxae 3). Middorsal line
uncertain). without midposterior processes, not elevated in lateral view.
—
Brucerolisbromleyana. PooreandStorey,2009: 152-153. Head, anterolateral margins concave, lateral comers acute and
D3i6s1t2rimbudteipotnh.,Tfhreomtyapeboltoctaolmitoyfadnidatoonmlyooczoen,fi6r2°m2e6d'Sr,ec9o5r°d44is'Ea,t wpriodjeecatsinmgaaxnitemruiomrlsy;pawnibdetthwebeentwleaetenraalnmtearrogliantesraolfecyoersn;erhseaads
without paired processes on transverse ridge at bases of
SouthernIndianOcean.
antennae 1,withoutpairedtuberclesbetweeneyes,withsmall,
Remarks.Brucerolisbromleyanacanbeidentifiedbythesmall blunt median posteriortubercle, with obscure lobes lateral to
acuteprojectionontheanterolateralmarginsofpereonite 1,the median posterior tubercle. Pereonite 1 lateral margin gently
emarginatetipsofepimera2and3andtheshort,concavepalm sinuous, lateral margin upturned over anterior half, obscurely
onthemalepereopod2propodus.Theonlyotherspecieswith duplicated, without submarginal ridge, dorsal surface with
a small acute projection on the anterolateral margins of oblique-transverse ridge reaching near margin. Coxal dorsal
pereonite 1 areB.maryannaeandB.macdonnellae,bothfrom plate 2 0.9 times as long as half pereonal tergite 2 width
theSouthAtlantic.Brucerolismaryannaecanbedistinguished (followingplatesincreasinginlength);plate41.3timesaslong
from B. bromleyana by the serrulate anterior margin of the ashalfpereonaltergite4width;plate6extendingbeyondtipof
head and pereonite 1 and by the rounded posteriormargin of pleotelsonby2.3timesmiddorsallengthofpleotelson,thepair
the pleotelson (that ofB. bromleyana is concave). Brucerolis diverging over entire length, almost straight except at apex;
macdonnellae also has a rounded posterior margin of the pleonal epimeron 2 1.7 times length of pleotelson; pleonal
NewspeciesofBrucerolis(Crustacea: Isopoda:Serolidae)fromseasaround NewZealandandAustralia 155
Figure6.Brucerolishowensissp.nov.Holotypemale(NIWA27431):dorsalandlateralviews,detailoffrontofhead,sternitesofpereonites1-7,
pleonites 1-3,medialridgeofpleonites 1-3,uropod. Paratypefemale(NIWA27428): dorsalandlateralviews,medialridgeofpleonites 1-3.
Scales=10mm.
156 M.J.Storey&G.C.B. Poore
Figure7.Brucerolishowensissp.nov.Holotypemale(NIWA27431): antennae1,2,mandibularincisors,palp,maxilliped,pereopods 1,2.