A NEW SPECIES OF INGOLFIELLID AMPHIPOD (CRUSTACEA AMPHIPODA) FROM WESTERN AUSTRALIA

6 Pages·2003·1.9 MB·English

by  Susana Gallego Martinez

RecordsoftheWesternAustralianMuseum22:75-80(2003).
A new species of ingolfiellid amphipod (Crustacea: Amphipoda)
from Western Australia
SusanaGallegoMartinezandGaryC. B. Poore
MarineBiologySection,MuseumVictoria,GPOBox666E,Melbourne,Victoria3001,Australia
emails:[email protected];[email protected]
Abstract - A third species, Ingolfiella quokka sp. nov., is added to the
Australian fauna, the first from Western Australia. The new species is from
an intertidal sandy beach environment; previously described Australian
speciesinhabitthemarineshelfofsouth-easternAustralia.
INTRODUCTION IngolfiellidaeHansen,1903
The ingolfiellidean amphipods are a small group Ingolfiellaquokkasp.nov.
of about 30 species included in two families, the Figures1-3
monotypic Metaingolfiellidae, and Ingolfiellidae.
Theirdistributionrangesfromthedeepseathrough Holotype
shallow marine sediments and intertidal sands to Female, 1.08mm (WAMC33548 on3slides),City
freshwater springs and caves. The presence of an of York Bay (32°00'S, 115°36'E), Rottnest Island,
"eye-lobe" distinguishesthesuborderIngolfiellidea Western Australia, sandy beach, S. Griffin, July
from other suborders of the order Amphipoda. 1991.
Whileitisprobable thatthe group ismonophyletic
their phylogenetic isolation from Gammaridea in
Paratypes
particular is questionable (Lowry and Poore, 1989; Female, 1.54 mm (WAM C33549); male, 1.25 mm
Dahl,1977).Stock(1979; 1977;1976),DojiriandSieg (WAM C33550); female, 1.48 mm (WAM C33551,
(1987), andRuffoandTaglianti (1989)havestudied with 2 slides); female, 1.27 mm (WAM C33552);
the systematics and zoogeography of the group. female,1.08mm(WAMC33553,with1 slide);male,
Stock (1976) divided the family Ingolfiellidae into 1.06mm (WAMC33554, with 2slides);female,0.87
three genera, and the largest genus, Ingolfiella, into mm (WAM C33555); female, 1.34 mm (WAM
subgenera. The question of subgenera was C33556); female, 1.38 mm (WAM C33557); female,
addressed again by Ruffo and Taglianti (1989). 1.31 mm (WAM C33558); female, 0.91 mm (WAM
LowryandPoore (1989)had difficultyplacingtheir C33559); female, 1.06 mm (WAM C33560); female,
tuthnweaoimrbuisgesufoouuultnshels-yse.aisnWteearnnydosunbAogutesntaurdsadlaifnaudnrthqeuresstptoeicotinheeisds J15.226443m)m; f(emNaMlVe,J502.47482)m;mfem(alWe,AM1.22C3m35m61)(.NMAlVl
collectedwithholotype.
debate, especially as the Ingolfiellidea as a whole
are subject to a phylogenetically based
reclassification (R. Vonk and F. Schram, personal Description
communication,2002). Female(basedonholotype,1.08mm,andparatype
A new species of ingolfiellids was discovered in female, 1.48 mm). Body segments laterally
samplestakenonasandybeachonRottnestIsland, compressed. Head, anterodorsal margin rounded,
Western Australia, and is here described. The withoutrostrum;"eye-lobe" semicircular.Pereonite
material comprises 16 individuals, 2 males and 14 1 abouthalfaslongashead;posteroventralmargin
females. The description is a composite derived oblique;deeperanteriorlythanposteriorlysuchthat
after dissection of several individuals. Types are pereonites 1 and 2 only weakly separated.
lodged in the Western Australian Museum, Perth Pereonites 2-7 increasing in depth posteriorly.
(WAM), and Museum Victoria, Melbourne (NMV). Pleonites 1-3 with posteriorly rounded epimera.
Abbreviationsareasfollows:Al,A2,antennae 1, 2; Urosomites 1 and 2 not markedly differentiated
Gl, G2, gnathopods 1, 2; MX1, MX2, maxillae 1, 2; from pleonites, of similar length; urosomite 3 with
MD, mandible; MP, maxilliped; P3-P7, pereopods lateralplatesenclosingbaseoftelsonanduropod3.
3-7; PL1-PL3, pleopods 1-3; r, right; 1, left; UR1- Antenna 1, peduncular article 1 as long as head;
UR3,uropods1-3. ratioofarticles 1.0:0.4:0.3;flagellumoffourarticles,
76 S.GallegoMartinez,G.C.B.Poore
WAM
Figure1 Ingolfiellaquokkasp.nov.,holotypefemale, C33548;RottnestIsland,WesternAustralia.
slightlymore thanhalflengthofpeduncle, article4 palm, palmwithoutteeth; dactyluswithfour teeth.
with one apical aesthetasc; accessory flagellum of Gnathopod 2 palm at 45° to longitudinal axis;
three articles, last minute, reachingend of article 2 carpus 1.7 times as long as wide; palm defined
of flagellum. Antenna 2, peduncle as long as proximally by an obtuse angle bearing two
peduncle of antenna 1; ratio of articles spiniform setae (proximal one longer and more
0.4:0.2:1.0:0.8:0.8; flagellum of five articles, slightly curved than other), three triangular teeth along
less thanhalflength ofpeduncle, article5 with one palm, three flagellate spiniform setae and five
apicalaesthetasc. simple setae; dactylus as long as palm, with four
Mandiblemolarprocessesacute;spinerowoftwo teethoninnermargin.
club-like spines; lacinia mobilis about two-thirds Pereopods 3 and 4, propodus with three distal
width of incisor process on left, half on right, each setae;dactyluswithtwodistalsetaeandcylindrical
obscurely toothed; incisor process with five blunt trifid unguis. Pereopods 5 and 6, merus with
teeth on leftand right. Maxilla 1, innerplateblunt, spiniform seta and simple seta; carpus with two
withoneseta;outerplatewithfourcuspidatesetae, distal long stout setae, two short stout and two
with three, two, three, five cusps respectively;palp slender setae; propodus with five distal setae on
of two articles, with two unequal apical setae. pereopod6,andthreesetaeonpereopod5;dactylus
Maxilla 2, inner and outer plates each with four with cylindrical bifid unguis. Pereopod 7, merus
terminal setae. Maxilliped basal endite with two with one distal stout seta and two slender setae;
apical setae; palp articles 1-4 with three, one, one carpus with one distal short stout seta, three long
and one mesial setae respectively, article 5 with stout setae and three slender setae; propodus with
longfalcateunguis,setaatmidlengthandatbaseof three distal setae; dactylus stout, curved with one
unguis. subtriangular spike at midlength, unguis not
Gnathopod 1 coxaatanteriorofpereonite;carpus defined. Coxalgillsovate, small, onpereonites 3,4,
2.4timesaslongaswide,palmwiththreeproximal and5.Nooostegites.
spiniformsetae, threepairs ofpinnatesetaeatmid- Pleopods1-3subtriangular,withoutdistalsetae.
Anewingolfiellidamphipod 77
WAM
Figure2 Ingolfiellaquokkasp. nov. Paratypefemale, C33551: A, leftgnathopod 1;B, rightgnathopod2, lateral;
CH,,lpeeftregonpaotdho7p.oPdar2atpyaplemmaalned,dWacAtyMlusC,33m5e5s4ia:l;1,Dri,ghptergenoaptohdop3o;dE,2,ppearleompaondd4;daFc,typleurse,ompeosdia5l;.G,pereopod6;
Uropod 1 peduncle with two distal setae, three lateral setae, ramus short, broad, with long
without a long reversed seta on lower margin; distal seta. Telson subsemicircular, with pair of
inner ramus 0.9 times length of peduncle, with longdorsalsetae.
lateralrow ofeightlongsetae,edgesofapexfinely Male (based on paratype, 1.06 mm). As female
denticulate; outer ramus half as long as inner except in the following. Gnathopod 2 carpus palm
ramus,withonesubdistalseta.Uropod2peduncle definedproximallyby an obtuse anglebearingone
with three obliquely transverse rows of (proximal long curved spiniform seta and more distally on
to distal) nine, seven, nine complex setae; rami innersurfaceonestrongflaringtooth-likeseta;palm
uniarticulate, outer 0.7 times length of peduncle, with three subtriangular teeth and nine simple
innerramus0.9 timeslengthofouterramus; outer setae. Pleopods slightly narrower than in female;
ramus with three setae; inner ramus with two pleopod 1 only withtwoshortdistalsetae. Uropod
setae. Uropod 3 with one ramus; peduncle with 2pedunclewithashortcurvedsetahookeddistally
78 S.GallegoMartinez,G.C.B.Poore
WAM
Figure3 Ingolfiella quokka sp. nov. Paratype female, C33551: A, uropod 1; B, right uropod 2, lateral; C, right
uropod2,mesial;D,detailcomplexsetaeonmesialfaceofuropod2;E,antenna1;F,antenna2;G,maxilla1;
aH,ndmarxiiglhltast2i;pIp,lemda.xiPlalriapteyd;peJ,mmaalen,diWblAe;MK,C3v3e5n5t4r:alL,viriegwhtofurmoapndoidbl2;esM,,apnlteeroipoordast1t-o3p;,Nl,acuirnioasommoibtilei3s,odnorsleaflt
viewwithtelsonanduropods3.
:
Anewingolfiellidamphipod
79
to meet a broad triangular marginal projection of bearing Y-shaped setae; (2) gnathopod 1 dactylus
thelowermargin. withfourteeth;(3)pereopods3-4unlikepereopods
5-7(diagnosticofTethydiella);(4)pereopods3and4
Etymology dactyli with trifid unguis (unlike Antilleella, where
For the Quokka (Setonix brachyurus), a species of the unguis is bifid); (5) absence of a sharp inner
wallaby living on Rottnest Island in Western spur distally on the basal part ofin pereopods 3-7
Australia and afterwhichthe island wasnamedby dactyli; and (6) the complex nature of the mesial
WillemdeVlaminghin1696. spines on uropod 2. However, thenew species can
be distinguished from I.fuscina by: (1) absence of
DISCUSSION unguis in pereopod 7; (2) female probably devoid
of oostegites (always present in Tethydiella); (3)
Ingolfiella quokka is most similar to species that sexual dimorphism in gnathopod 2; (4)
have been assigned to the subgenus Antilleella subtriangular pleopods present in both sexes
sharing characters such as a reduced or absent (lamelliform with one or two apical setae in I.
ocular lobe, subtriangular pleopod 1 modified in fuscina); (5) malepleopod 1 subtriangular with two
males with two apicalsetae, and similarpereopods apical setae (only one in I.fuscina); (6) absence of
3-7.OfthespeciesplacedinthissubgenusbyRuffo terminal, dorsal, pectinate spine on male uropod i
and Taglianti (1989) it is similar to I. putealis, I. (uropod 1 sexually dimorphic in I.fuscina); and (7)
fontinalis, I. tabularis, I. margaritae, I. similis, I. presence of a basofacial hook on the peduncle of
unguiculata andI. beatricis asfollows: (1) possession uropod2inmales.
of small ocular lobe (reduced or vestigial in most IngolfiellaquokkadiffersfromI. australiana Lowry
speciesofthesubgenus,exceptforI. similiswhereit and Poore, 1989, another Australian ingolfiellid.
is absent and I. beatricis where itis developed); (2) This species shares characters with species
antenna 1 flagellum offour articles andwiththree- belongingtothesubgenus TrianguliellaStock, 1976.
articled accessory flagellum; (3) serrated palmar Bothspecieshave (1) asmall semicirculareyelobe;
margin of gnathopod 2 (variously eight teeth in I. (2) antenna 2 flagellum of five articles; (3)
similis, smoothmargin inI. beatricis); (4) gnathopod accessory flagellum of antenna 1 of three articles,
2 sexually dimorphic; (5) gnathopods 1 and 2 the last one minute; (4) dactylus of gnathopod 1
dissimilar; (6) basofacialhook on peduncle uropod with four serrations; and (5) pleopods 2 and 3
2 in males; (7) subtriangular pleopods present subtriangularinbothsexes.However,I. australiana
(subtrapezoidal in I. beatricis and I. unguiculata), is quite different from I. quokka (1) antenna 1
modified in males with two distal setae; and (8) flagellum of five articles; (2) maxilla 2, inner and
uropod 2 with three obliquely transverse rows of outer plates with five plumose setae; (3)
spines (except for I. putealis with four rows and I. gnathopod 2palmwith distaltriangulartooth and
fontinaliswithtworows). quadratetoothseparatedbyanotch;(4)pereopods
Ingolfiella quokka differs from most species of the 5 and 6, dactylus with unguis not defined; (5)
subgenus Antilleella in: (1) absence of a reversed pleopod 1 digitiforminmalewithtwoapicalsetae,
modified seta in male gnathopod 2; (2) females and subtriangular in female with one seta: (6)
without oostegites (except for I. unguiculata and I. uropod 1 has a ventral peduncular row of stout
beatricis)-unlesssupposedfemalesofourandthese setae (not reported in any other ingolfiellidean);
speciesarenotmature;(3)pereopods3and4unlike and (7) uropod 2 without basofacial hook on
pereopods5-7,thatis,dactyliofpereopods3and4 peduncle, and with five obliquely transverse rows
with long apically bifid unguis, dactyli of ofsetae (notcomplexsetae).
pereopods 5 and 6 with stronger bifid unguis, and
pereopod 7 lacks unguis; (4) absence of a sharp
inner spur distally on thebasalpartofdactyli; and ACKNOWLEDGEMENTS
(5) dactylus of gnathopods 1 and 2 with four We thank Ronald Vonk, Zoological Museum of
seTrrhaetinoneswinsspteecaidesofditfhfreeres(ferxocmepIt. fboarssIi.abneaa,trtichies)o.nly Afimrssttderradftamof,thTihsepaNpeetrh.erlands for comments on a
Australian species which could be placed in
subgenus Antilleella. The complexity of the palmar
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ManuscriptreceivedJanuary92003;accepted18June2003