Haustorius jayneae, a New Species of Haustoriid Amphipod from the Northern Gulf of Mexico, with Notes on Its Ecology at Panama City Beach, Florida U.S.A

12 Pages·1991·7.5 MB·English

by  John M Foster

GulfResearchReports, Vol. 8, No. 3, 259^270, 1991
HAUSTORIUS JAYNEAE, A NEW SPECffiS OF HAUSTOKHD
AMPHIPOD FROM THE NORTHERN GULF OF MEXICO,
WITH NOTES ON ITS ECOLOGY AT
PANAMA CITY BEACH, FLORIDA U.S.A.
JOHN M. FOSTER* AND SARA E. LECROY*
^504 East Pine ForestDrive. Lynn Haven, Florida 32444
^Invertebrate Zoology Section, GulfCoast Research Laboratory,
P.O. Box 7000. Ocean Springs, Mississippi 39564
ABSTRACT A new species of sand-burrowing ampbipod, Haustoriusjayneae, is described from the
swashzoneand shallowsubtidalsandsalongthenorthFloridaandMississippiGulfcoasts. It ismostsimilar
to H. canadensis from the American Atlantic coast, differing primarily in the presence of a distinct
anterodistal spinous lobe on pereopod 6, article 5; a longer row of distal marginal spines on pereopod 7,
article 4; and fewerproximal spines on the peduncle ofuropod 1. A revised keyto the known species of
Haustorius is included andinformation ontheecology of//.jayneaen. sp. at Panama CityBeach, Florida,
is reviewed.
Introduction
Five additional haustoriidspecies originally assigned
Taxonomic and zoogeographic studies of Gulf of to the genus Haustoriushave sincebeen placedin other
MexicoHaustoriidaearescarce. Alackofkeys forGulf genera. These include the Gulf of Mexico species
material, a reflection of the underdeveloped stale of Pseudohaustorius americanus (Pearse, 1908) and the
knowledge about the family in the region, has limited North Atlantic species Acanthohaustorius spinosus
woricers to the use ofkeys and guides written primarily (Bousfield, 1962), both removed from Haustorius by
forAtlanticcoastmaterial. As aresult,government and Bousfield (1965). In addition, the northem Pacific
private environmental assessment reports often provide species Eohaustorius washingtonianus (Thorsteinson,
species lists in which citations are limitedto genera, or 1941), E. eous (Gurjanova, 1951), and E. cheliferous
where species are listed which do not occurin the Gulf (Bulycheva, 1952) were removed from Haustorius by
of Mexico. Barnard (1957).
Existing knowledge of the Gulf Haustoriidae is re- Anumberofundescribedhaustoriidspeciesareknown
ported primarily in papers which describe new species to occur in the Gulf of Mexico. Bousfield (1970)
(Pearse, 1908; Robertson and Shelton, 1978; Robertson indicated that at least ten undescribed species ofHaus-
and Shelton, 1980; Thomas and Barnard, 1984; Foster, toiiidae occur in the region, although the number of
1989) and in several ecological papers which have species inthetype genus was notreported. In addition,
reported undescribed species and recognized them as recent studies haveresulted inthe reporting ofa ‘Tong-
such (Thomas, 1976; Shelton and Robertson, 1981). rosfrate” Haustorius species from North Carolina
Foster (1989) reviewed the history ofhaustoriid studies (Bousfield, 1965; Fox and Bynum, 1975). Although no
in the Gulfand listed the known species. formal description was published, this form is included
Amongthenumerous taxonomicproblems associated in the keyprovided in this paper.
with the Haustoriidae, questions concerning the type EcologicalreportswithreferencetoHaustoriusinthe
genus Haustorius Muller, 1775 are particularly signifi- northemGulfofMexico are numerous. Forexample, in
cant. Threespeciesarecurrentlyrecognizedinthegenus. the area between Cape San Bias, in the Florida Pan-
The type species,Haustorius arenarius (Slabber, 1769), handle, and Mississippi Sound, the genus has been
is distributed in the northeastern Atlantic and has also reported by Saloman (1976), Saloman and Naughton
been reported from the Gulf of Mexico (Pearse, 1912), (1977;1978), Saloman et al. (1982), Taylor (1987), and
althoughCroker(1967)consideredsuch earlyrecords to Heard and Stuck (1988). Thomas (1976) also reported
betheresultoferroneousidentifications. Theremaining an undescribed species of Haustorius from Barataria
two species, Haustorius canadensis Bousfield, 1962 and Bay,Louisiana, occuringinfinesandfrom thedrift line
Haustorius algeriensis Mulot, 1967, are distributed in to a depth of 1 -2 meters, and Robertson and Shelton
the northwestern Atlantic and along the North African (1980) found an undescribedspecies ina similarhabitat
coast in the Mediterranean Sea, respectively. on the Texas coast.
Manuxeript receivad Oclobar 12, 1990; accepted December 19, 1990.
259
260 Foster and LeCroy
PK-f,USNM 250742, Perdido Key,Florida, swa.shzone
Methods in medium sand, 23 July 1987, coll. R.W. Heard. Male,
10.0 mm, MISS-a, USNM 250743; female, 10.0 mm,
MISS-b,USNM250744;female,8.0mm,MlSS-c USNM
Material for liiis study came from several locations 250745,RangerLagoon,HornIsland,MississippiSound,
ainlcolnugdefiSlelcAonadstrsewofBaHyo,rPiadanamanadCiMtiyssBiesasicphp,i.CapTehSeasen swa.sli zone, 25 Jan. 1989, coll. R. W. Heaid.
AdditionalMaterial: 5 males,9females,4juveniles,
IBsilaasn,das,ndMiPsesridsisdioppKie.y,IFnloarlildal,ocaalsitwieelsl,aasniHpohrinpoadnsdwSleiriep U11S42N,MSt2A50n7d4r6e;w4Bamya,leFsl,or8idaf,emWaelesst,Pa1sjsu,vemneidlei,umGCsaRnLd
scuolclteicotneddeivllictehse s(wyaasbhbyzopnuempasn)d, fpruosmh tniedtasl,poorolscowriitnhg Finoswtearv.e4pomoalleasb,ov5efsewmaaslehs,zo7nej,uv1e4niOlcets.,1U9S89N,Mcol2l5.0J7.4M7.;
tools. See Salomon (1976) and Heard and Stuck(1988) 31 males, 42 females (I ovg,), 73 juveniles, USNM
for detailed iiiforinatiou on localities, methodology, 250748; 7 males, 7 females (1 ovg.), 9juvetiiles, GCRL
sedinienlology, and associated fauna.
1143,PerdidoKey,Florida,subtidalsand,4-6Oct. 1989,
aasnddMoparolssgatilerniasonrdo,fbvteelncitearuaaslnetieonnfnttahheeeitarenxodtr,iuearn,stoapotopidopsnosaaelrdeonrtgeofteihureirtmeedariitonor cUolSl.NRM.W2.50H7e4a9r;d.1 2mamlael,es1, f1efmeamlael.eG(oCvRg.L),121j4u4v,enHiloersn,
Island, Mi$.si.ssippi Sound, swash zone sand, 25 Jan.
axis ofthe body. 1990. coll. R. W. Heard. 7 males, 4 females (3 ovg.),
USNM250750;8males,3 females(2ovg.),GCRL 1145,
Haustoriidae Sicbbing, 1906 Ship Island, Mississippi Sound, subtidal sand, 12 July
Haustoriinac Bousfield, 1965 1988, coll. R. W. Heard. 2 males, 2 females, USNM
Haustorius Muller, 1775 250751; 1 male, 1 female, GCRL 1146, Ship Island,
Haustorius jayneae, new species Mississippi Sound, swash zone sand, 12July 1988, coll.
Figures 1-4 R.W. Heard.
Haustorius new species: Saloman and Naughton, 1977, Diagnosis
pp. 359-362
Antenna 1, accessory flagellum 4-5 segmented.
Haustorius species: Saloman and Naughton, 1978, pp. Rostrum short, subacute, wide at base, not exceeding
67-68 midpoint ofantenna 1, peduncle 1. Pereopod 5, article
6, anterior margin with 3-4 spine groups. Pereopod 6,
Material Examined article4, posteriormarginmarkedly oblique proximally,
bearing 3-4 spines distally; article 5 subquadrate with
Holotype: Female, 6.0mm, SAB-e, St. Andrew Bay, distinct anterodistal spinous lobe. Pereopod 7, coxal
Florida, West Pass, medium sand in wave pool above plate with setae on posterodistal margin only; article 4,
swash,25 °C, 28ppt, 14Oct. 1989,USNM250725,coll. proximal margin sharply set offfrom posterior margin,
J. M. Foster. posterior margin with 1 spine group, distolateral mar-
Paratypes: Female, 8.0 mm, SAB-a, GCRL 1141; ginal spines extending half length of distal margin.
female, 5.3 mm, SAB-b, USNM 250726; male 5.0 mm, Uropod 1,peduncle, dorsolateral marginwith 1-2proxi-
SAB-c, USNM 250727; male. 4.0 mm, SAB-d. USNM malspines,proximal anddistalspinesonly. Telsoncleft
250728; male,6.0mm,SAB-f,USNM250729;male,7.0 one-third distance to base.
mm,SAB-g,GCRL 1141; male,5.0mm.SAB-h,USNM
250730; female,7.0mm,SAB-i, USNM250731;female, Description
7.0 mm, SAB-j, USNM 250732; male, 6,0 mm, SAB-k,
USNM250733,PanamaCityBeach,Florida,moderately Paratvpe male SAB-f. 6.0 mm. Panama City Beach.
sortedfinesand, swash zone, 18.0°C, 32.70 ppt,4 Feb. Florida
1975,coll.C.H.Saloman. Male,5.5mm,CSB-a,USNM
250734; male, 6.0 mm, CSB-b, USNM 250735; female Head - Broadest medially, rostrum blunt, wide at
(ovg), 5.0mm, CSB-d, USNM250736; female,5.0mm, base; slightly exceeding anterolateral apices, extending
CSB-f, USNM 250737; female, 7.0mm. CSB-g, USNM one-quarter of dorsally visible length of antenna 1,
250738, CapeSanBias,Florida, wet,intertidal finesand peduncle 1; antennal sinuses markedly convave.
with shell hash, 27.5 °C, 29ppt, 27 Sept. 1987, coll. J. Antenna1-Pedunclearticle 1 and2subequal,article
M. Foster. Male,7.5 mm,CSB-c, USNM250739; Cape 3 two-thirds length ofarticle 2; peduncle 1, dorsolateral
San Bias, Florida, longshore tidal pool on moderate margin lined with plumose setae, ventrolateral margin
energybeachinfinesand, 16.8°C,30ppt, 11 Mar. 1989, with4pilosespines; peduncle 2 wideneddistally,dorsal
coll.J. M. Foster. Male,6.0mm.PK-d, USNM250740; margin with a row of plumose setae interspersed with
female 6.0 mni, PK-e, USNM 250741; female, 7.0 mm. shortersimple setae, lateralsurface withmixedplumose
A New Haustorud Ampidi^od From Tiie Golf Of Mexico 261
Figure 1, Haustoriusjayneae n. sp„ Lateral view ofadult female (6.0 mm) from St. Andrews Bay, Florida.
Scale = 1.0 mm.
andsimplesetae;peduncle3,ventralmarginwithrowof Lower Lip - Iimerlobes extending two-thirds length
long pilose spines inserted near articulationwith flagel- ofouter lobes, truncate distally and finely pilose; outer
lum; flagellum wilh 9 articles, each with short simple lobesbroadlyrounded,pilosearoundmargins,bothlobes
setae inserted letiiiinally, several wilh aesihetsacs; with numerous short spines along inner distal margin.
accessory flagellum 4 segmented. Mandible - Right side, incisorbifid, rakerrow of 10
Antenna 2 - Peduncle 4 expanded venlrally to form distallyserrateblades;molartriiuralivewilh 1 projecting
deepJobewithbroadly roundeddistalprojection,ventral plumoseseta;palparticle 2withmarginalandfacialrow
margin with 22 spines inserted laterally and a row of ofshort simple setae, article 3 with 17 pectinate spines
densely plumose setae inserted medially along margin, incombrow, 14-15distallytapered,minutelypectinate
5 plumose spines on proximal half of ventral margin, tenninalspines. Leftside, laciniamobilisshort,conical.
lateral surface with row of5 setae nearproximal dorsal Maxilla 1 • Inner plate wilh 10 sparsely plumose
margin,medialsurfacewithobliquerowof6setaeacross marginal setae; outer plate with 4 stout, smooUi, blunt
width of article, dorsal margin with distolaleral row of and 12 slender, minutely serrate, subacute distal spines;
plumosesetae,ventralmarginwith2-3thinpilosespines palparticle2withmarginalandapicalplumosesetae,and
distally in sinus formedby distal lobe of article; article tapered tenninal spines with recurved tips; bailer lobe
5 slightly over half length of article 4, with strongly large and densely setose.
convex ventral lobe, ventral margin lined with long Maxilla 2 • Inner plate linguiform, slender, with
plumosesetae,disloventralcomerwithclusterofplumes, plumose marginal setae and oblique row of plumose
several thin spine-like setae and 1 Uiick pilose spine, facial setae; outerplate large,lunate, outermarginlined
distolaleral margin with row ofthinner, shorter plumose with fine setae, 14 stout, distally tapered comb spines
setae and scattered slender, simple setae; distal half of medially, inner margin with 30 - 32 sparsely plumose
dorsal margin with row of plumose setae; flagellum of setae distally, lined with minutely plumose setae proxi-
10 articles, article 1 longest, with disloventral row of mally.
plumose setae, article 2 half lengtli of article 1 and Maxilliped-Innerplatewith 11 innermarginalsetae,
bearing 1 disloventral plumose seta, article 3 with 1 proximal setae short and finelypectinate on both edges,
disloventralplutnoseseta,remainingarticleswithgroups distal .setae longer,plumose, apical marginwith2 blunt,
of simple temiinal setae. stout spines, aboral surface wilh 2 penicillaie setae and
Upper Lip Broad, apex flattened, comers abruptly a row ofdistal spines, oral surface with transverse row
rounded.
262 Foster and LeCroy
Figure2. Haustoriusjayneaen.sp.,paraljpemaleSAB-f(6.0 mm): (A) mandible;(B)maxilla 1; (C)maxilla2; (E)lower
Up. Adult male(6.0 mm),St. Andrew Bay, Florida: (D) maxUllped. Scales: a = 0.2 mm (B-C,E); b = 0.2 mm (A); c=
mm
0.4 (D).
of distal spines; outer plate slightly broader than inner distal margin with a row of simple setae, increasing in
with 12recurvedspines andnumerous transerve rows of lengthdistally; article 2narrowedproximallywith long,
setae; palparticle 3 withexpanded distally, dense trans* widely spaced simple setae on posterior margin; article
verse rows ofsetae oninner margin, article 3 geniculate 5, posterior margin with dense clusters of long simple
withlongserratesetaeandsimplesetaeondistalmargin, setaealonglateralandmedialsurfaces; article6one-half
6-7
9elongate spines terminally, aboral surface with central length of article 5, anterodistal margin with
row of simple setae. transverse rows of long, distally recurved, finely pecti-
Coxal Plates-Plates 1-4increasinginsizewitheach nate setae, posterodistal margin with 5 row of shorter,
successive plate, combined ventral margins forming a distally recurved, finely pectinate setae, posterodistal
gentle curve, margin with 5 rowsofdistallyrecurved, finelypectinate
Gnathopod 1 - Coxa deeper than wide, gently con- setae; article 7 one-quarterlengthofarticle 6,projecting
caveposteriorlywith6plumoseposteriormarginalsetae, nail subequal in length to article 7.
posterovental angle with 3 long, plumose setae, antero-

A Haustoriid Amphipod From The Gulf Of Mexico 265
Gnathopod 2 - Coxa deeper than wide, anterior with several short setules proximally; article 4 with
margin convex, posterior margin nearly straight, with 6 plumose setae onposteriormargin, anteriormargin with
plumosesetaedistally, anterodistalmarginwith6simple 3 stoutmarginalspinesinterspersed inarow ofplumose
setae; article 2slightly narrowedproximallywithrow of setae,anterodistalmarginwithaclusterof4spines,distal
evenly spaceddusters oflong simple setae onposterior margin with a row of 6 spines, lateral surface with 6
margin; article 5, anterior margin with evenly spaced clustersof3-6stoutspines,medialsurfacewithclusters
groups ofminutely pectinate setae, outerlateral surface of plumose setae; article 5, distomedial margin with
with scattered simple setae, anterodistal margin with cluster of long plun^ose setae, posterior half of distal
cluster of 5 minutely pectinate setae, posterior margin marginwitharowof6stoutspines,posterodistalmargin
with 3-5 groups ofmedially inserted, spatulate comb lined with plumosesetae, anterior marginwith 1 cluster
spines on distal half, row of simple setae along entire of2 spines, anterodistal angle with cluster of5 spines,
margin; article 6, anterior margin with 6 - 7 transverse lateralsurfacewith4clustersof4- 10stoutspines;article
rows oflong,distally recurved,minutelypectinatesetae, 6 nakedposteriorly, anterior marginwith 3 clusters of2
posteriormarginwithdistalclusterofminutelypectinate -4stoutspines,terminallywith3longand2shortspines
setae, posterodistal margin strongly produced, dactyl and 1 short plumose setule.
toothed on flexorsurface, closing onposterodistalproc- Pereopod 6 - Coxa rounded posteriorly, posterior
ess of article 6 to form chelate gnathopod. margin lined with simple setae; article 2 subquadrate,
Pereopod 3 - Coxa strongly convex anteriorly, pos- posteriormarginlined withsimple setae proximally and
terior margin with 7 plumose setae, posterodistal angle distally,bare gapin center(present onmostspecimens),
with 3 long, simple setae, anterodistal margin with 6 anteriormarginwithrow ofplumosesetae andwithrow
shorter simple setae; article 2, distal half of posterior curving across lateral surface proximally, anterodistal
margin with several groups ofsimple setaealong lateral marginwith3long,pectinatesetae;article4subtrianglu-
surface,longplumosesetaeandseveralthinsimplesetae, lar, longerthan broad, anterior margin lined with dense
posterodistal margin with 5 plumes and 1 short simple plumose setae occuring in medially placed diagonal
seta, anterior margin with 5 short, scattered setules; rows, marginalspines stout, short, occuringingroupsof
article 4, anterior margin lined with 9 plumose setae, 1 to 4, medial anterodistal angle with 1 long spine and
anterodistal angle with a cluster of 3 simple setae, numerous plumed setae, lateral anterodistal angle with
posteriormarginwith6groupsoflongplumosesetaeand 1 long spine, distolateral margin with 8 spines in row
shortsimple setae proximally, distalportion ofposterior extending about one-quarter length of margin, center
marginwithadenseclusterofmuchlongerplumosesetae distal margin with a group of 2 spines, posterior disto-
and 3 shortsimplesetae; article 5 with aclusterof5 - 6 lateralmarginwithrowof4spines,posteriormarginwith
simplesetaeonanterodistalmargin,posteriorlobeovate, 4 stout spines and a row of plumose setae, proximal
lined with 15 stout spines, some withaccessory setules, section of margin narrowing abruptly, lateral surface
lateral surface of lobe with 4 stout spines, posterior withclustersof2-4spines;article5subquadrate,.slightly
margin with 4-5 long plumose setae; article 6 subrec- widerthan long with defining lobe at anterodistal angle,
tangulaiwith13stoutspinesand 1 smallsetaonanterior anteriormarginwith3groupsof3-6spines,^terodistal
and distal margins, posterior margin bare. lobe with 5 spines, distal margin with central row of 12
Pereopod 4 - Coxa broad, anterior margin strongly spines, posterodistal angle with cluster of 4 spines,
convex, posterior margin with strongly angular lobe, posterior margin with 3 spines, lateral surface with 5
linedwithsimplesetae;article2shortwith4shortsimple groupsof1 -3spines,article6nakedanteriorly,posterior
setaeon anteriormargin,posteriormarginwith 6simple marginwith5groupsof2-5 spines,terminalspines 10.
setae and 2long plumed setae, posterodistal angle with Pereopod 7 - Coxa small, posterior lobe subacute,
2minutely pectinatesetae; article 3 with3posterodistal with simple setae ondistal margin; article 2ovate,with
minutely pectinate setae; article 4 lined with posterior a cluster of proximal plumose facial setae, anterior
marginal plumose setae and several scattered simple margin lined with plumed setae, distal half of margin
setae,posterodistalanglewith8simplesetaeandalateral with4distallytaperedpectinatesetae, anterodistalangle
row of 4 plumose setae, anterior margin lined with with 9 pectinate setae, posterior margin with scattered
plumose setae, anterodistal angle with 2 simple and 3 short setules, orbare; article 4 much broader than long,
minutely pectinate setae; article 5 with posteriorly di- proximal and distal margins nearly parallel posteriorly,
rected circular lobe fringed with 11 stout spines and 7 widening anteriorly, anterior margin twice length of
long simple setae; article 6 with 11 stout anterior mar- posteriorwith2groups of2-4spines,anterodistalangle
ginal spines, 7 long simple posterodistal marginal setae with 8spines,proximalmarginlinedwithplumosesetae,
and 1 distal marginal setule. posteriormarginwithcluster of 1 long and 2shortstout
Pereopod 5 Coxa broad, posterior lobe slightly spines, 1 long plumose setae (broken ofO, 5 pectinate
deeperandnarrowerthananterior,posteriormarginlined setae,posterodistal angle with 1 stoutspine,distomedial
with simple setae; article 2, posteriormargin linedwith margin with row of 16 spines, distolateral margin with
simple setae, anterior margin lined with plumose setae row of 10spinesextendingoverhalfthelengthofdistal
266 Foster and LeCroy
margin, lateral and medial surfaces with scattered clus- Distribution
ters oflong setae; article 6,posterior marginwith distal
clusterof2stoutspinesand1pectinateseta,posterodistal Haustorius jayneae occurs along sand beaches from
angle with 2shortlateral spines, row of4 longermedial Cape San Bias, Florida (Gulf County) to Mississippi
spines, clusterofsimple setae on medial margin, poste- Sound. Itinhabitstidalpoolsandtheswashzoneseaward
riorfacialspines2,anteriormarginal spines in6groups toadepthoftwometers;however,mostindividualsoccur
of5 - 7 spineseach, medialsurfacewithoblique row of in depths less than one foot.
4 spines near anterodistal margin, lateral and medial
surfaces with numerous clusters ofsimple setae; article Ecology
6anteriormarginalspinesin3groupsof2-4spineseach,
posteriormarginalspinesin4groupsof1 -4spineseach, AtPanama City Beach,Florida,monthlydensities of
medial surface with 1 group of 3 spines, lateral surface Haustorius jayneae and its distribution across the
with 1 group of2 spines, terminal spines 7. nearshore zone were studied for a period of years by
Pleopods-Pleopod 1,outerramuswith 15 segments, Saloman (1976) and Saloman and Naughton
innerwith 12; pleopod2, outerramus with 17 segments, (1977;1978;1984). The swash zone population was
innerwith 12; pleopod3 outerramuswith 16 segments, showntobethegreatestinMarchandAprilof1974-1975
inner with 13. with similarpeaks during May and June of 1976. In a
Pleosome - With characteristics of the genus. seriesofstations,beginningintheswashzone,extending
Uropod 1 - Ventromedial margin ofpeduncle with 2 throughaseriesofsandbars, and terminating atadepth
clustersofsimplesetae,dorsalmarginwith1 simpleseta of9.1meters,H,jayneae occurredprimarilyintheswash
and 1 stout spine proximally, 3 stout spines distally, zone and on the first sand bar (5.5% and 8.8% of all
interramal area with 3 spines; outer ramus shorter than organisms collected, respectively). No specimens were
inner with lateral spine groups 2-2"3-4, medial surface recoveredfrom the 9.1 meterstation. This conforms to
with5groups oflongsimple setae,increasinginnumber thepatternobservedbySameoto(1969) forH. canaden-
distally, terminal spines 6; inner ramus, ventrolateral sis at Sippewisett, Massachusetts, in that greatestdensi-
marginalspines ondistalhalfin2groupsof3-7 spines tiesare foundinareasofcompletesaturationatlowtide,
each, dorsal margin with 4 groups of simple setae, such as sand bars. Juveniles were present during all
terminal spines 9. monthsandovigerousfemaleswerepresentinallsamples
Uropod 2 - Dorsolateral margin ofpeduncle with a examined except those from January and May.
rowofslenderspinesofvaryinglengthsinterspersedwith The study area displayed an annual temperature
long simple setae, dorsomedial margin ofpeduncle with variation of 19.0 to 32.1 ®C andhad an average salinity
distal clusteroflongplumosesetae; outerramus slightly of31.8ppt. Thesedimentsconsistedof99-100%quartz
longer thaninner, lateral surfacewith3 clusters oflong sand(Sioman, 1976). During a laternine monthstudy
simple setae, terminal group of long setae; inner ramus inthesamearea,HJayneaecomprised16,5%ofthetotal
similar. populationoforganismsrecoveredfrom theswashzone,
Uropod 3 - Peduncle with 9 (5 medial, 4 lateral) 55%oftheCrustaceaand99%oftheAmphipoda. Atthe
spines; rami subequal, inner ramus with distal group of firstsandbar,H.jayneaecomprised34.1% ofallorgan-
3 spinesonmedial margin,2groupsoflongsimplesetae isms, 47% ofCnjstacea, and93% ofAmphipoda. May
on lateral margin, terminally with 5 spines, numerous and June were peak population periods (Saloman and
long, simple setae, 1 plumed seta; outer ramus 2-seg- Naughton, 1984).
mented, proximal segment with 2 dorsomarginal and 1 Saloman et al. (1982) investigated the macroinfauna
dorsodistal groups ofsimple setae, 6distoventralspines, of vegetated and unvegetated sediments within St,
distal segment slightly shorter than proximal segment, Andrew Bay and reported an undescribed Haustorius
thinner, with 7 terminal spines, numerous long simple from four localities. While tho.se specimens were not
setae. available forstudy, one ofthe stations conformedto the
Telson - Cleft one-third distance to base, lobes type locality ofH.jayneae. The locality, at West Pass
subrcctangular with small proximolateral lobes bearing of St. Andrew Bay, was unvegetated 100% sand.
3spines,distalmarginwith9spines,submarginalcluster
with 6 spines, dorsal surface with 1 long and 1 short Etymology
penicillate seta on each lobe.
This species is named in honor of Jayne E. Foster,
Holotvpe Female SAB-e. 6.0 mm. St. Andrew Bav. whose patience and support for this project are greatly
Florida appreciated.
Similar to male except for the following: Variation
Oostegites - Slender,increasing inlengthposteriorly
on pereopods 2-4,verysmall onpereopod 5, marginal Within the samples examined from four locations on
setae elongate, simple. the northern Gulfcoast,H.jayneae showedminorinlra-
A Haustored Amphipod From The Gulf Of Mexico 161
specific variation (Table 1). Minor variations were Remarks
observedinthenumberofaccessoryflagellumsegments,
spination of the pereopods, and the spination of the Haustorius jayneae is most closely related to H,
dorsolateralmargin ofthe peduncle ofiiropod 1. There canadenis Bousfield, 1962 from the American Atlantic
was also a trend toward an increase in number of coast. Majormorphological differences between it and
spines in all areas with increasing animal size. This otherknownspecies areshowninthekeyandinTables
variability is to be expected in highly spinous fossorial 2 and 3.
forms such as the Haustoriidae (Thomas and Barnard,
1984). KEY TO THE KNOWN SPECIES
OF HAUSTORIUS
(Modified from Bousfield, 1973)
TABLE
1
IntraspedflcVariationin SelectedCharactersofHaustoriusjayneae
SizeGroupingsofParatypes
4.0—5.0mm 5.1—6.0mm 6.1—8.0mm 8.41—10.0mm
Character Range(Mean) OverallRange
Antenna 1,# 4 4 4-5 4-5* 4-5
accessoryflagellum (4.0) (4.0) (4.1) (4.5)
segments
Mandiblepalp 3, 11-17 12-20 16-20 22-23 12-23
#combspines (13.0) (16.1) (16.6) (22.5)
Peteopod5,article 5 5-8 5-9 6-7 5-9
4,#posterodistal (5.0) (6.4) (6.8) (6.5)
spines
Pereopod5, article 3 3 3-^*’*' 3 3-4
6,#anteriormarginal (3.0) (3.0) (3.3) (3.0)
spinegroups
Pereopod6,article 5-6 4-8 6-9 6-10 4-10
4,#posterodistal (5.3) (6.3) (7.6) (8.0)
spines
Pereopod7,article4, 1 1 1 1 1
#longmedialposterior (1.0) (1.0) (1.0) (1.0)
marginalspines
Pereopod7,article4, 6-8 6-11 9-18 9-10 6-18
#posterodistal (6.8) (8.6) (12.0) (9.5)
spines
Pereopod7,article5, 6 6-7 6-7 7 6-7
#anteriormarginal (6.0) (6.3) (6.4) (7.0)
spinegroups
*Two specimens,MISS-bandMISS-chad5segments
Onespecimen,PK-fhad4groups
Foster and LeCroy
TABLE2
ComparisonofHaastoriusjayneaeandHaustorius canadensis
Character H. canadensis H.jayneae
Rostrum Acute,lessbroadbasally Subacute,triangular,wideatbase
Pereopod5,article6 4—5 anteriormarginalspinegroups 3,occasionally4 spinegroups
Pereopod6,article4 Longposteriormarginbefore Shorterposteriormargin,moredistal
proximalnarrowing,6posteriorspines pointofproximalnarrowing,segment
triangular, 3posteriorspines
Pereopod6,article5 Anteriormargin roundedgentlyto Articlesubquadrate withadistinct
distalmargin withoutclear anterodistaldefininglobe,lobewitha
anterodistalangle,6spinegroups clusterof3 spines,distalandanterior
alongcurve spinespresent
Pereopod7,coxalplate Setaealongentireposteriormargin Setaeonposterodistalmarginonly
Pereopod7, article4 Spinesondistolateralmargin limited Spinesondistolateralmarginmore
toposteriorone-fourth ofmargin, widely spacedandextendingatleast
closely spaced one-halflengthofmargin
Uropod 1,peduncle 3—4proximalspines, and 1—2 1—2proximal spinesandoccasionally
proximal setae 1 proximal seta
1. Uropod 1, dorsolateral margio of peduncle lined limited to posterior quarter of distal margin
throughout out with stout spines; pereopod 7, article 4, H, canadensis Bousfield
proximal margin rounding, continuous with posterior
margin; EUROPEAN SPECIES 2 Pereopod 6, article 5, anterodistal angle with defining
lobebearingaspinecluster;pereopod7,coxalplatewith
Uropod1,dorsolateralmarginofpedunclewithproximal setae onposterodistalmarginonly, article 4, distolateral
anddistal groups ofspines; pereopod7, article4,proxi- marginal spines extending to mid-margin
mal margin sharply set off from posterior margin; //. jayneae n. sp.
AMERICAN SPECIES 3
Acknowledgements
2. Accessory flagellum4+segmented; pereopod7,pos-
terior margin of article 4 with 3-4 stiff spine groups The authors wish to thank Dr. Richard W. Heard of
H. arenarius (Slabber) the GulfCoast Research Laboratory for technical assis-
tanceandspecimensfromPeniidoKey,FloridaandHorn
Accessory flagellum 3-segmented; pereopod 7, proxi- and Ship Islands, Mississippi (collected under contract
mal andposterior marginofarticle4linedcontinuously totheNationalPark Service). Dr. Edwin J. Keppnerof
with long stiff setae H. algeriensis Mulot Panama City Beach, Florida, also provided technical
support. We thank Dr. Roger Lincoln of the British
3. Rostrum verylong, extending to the end ofantenna Museum, Dr. J. L. Barnard of the Smithsonian Institu-
1, peduncle segment 1 Haustorius “long rostrate tion,andDr. DeniseBellan-Santini oftheInstitutocean-
form” ographique of Monaco for providing additional speci-
mens and/or information. We also thank the Gulf
Rostrum short, not exceeding midpoint of antenna 1, County,Florida,CountyCommissionfortheirassistance
peduncle segment 1 4 atCapeSanBias. Webenefitedfrom andappreciatethe
contributions of two anonymous reviewers. Many of
4. Pereopod 6, article 5, anterodistal angle broadly theirsuggestionswereincorporatedintothispaper. This
rounding;pereopod7,coxalplatewithsetaealongentire research was supported in part by the National Park
posterior margin, article 4, distolateral marginal spines Service (Contract #CA-5320-9-8001).