Nepelle, nelera, a new genus and species of marine amphipod from Australia (Crustacea: Amphipoda: Urohaustoriidae)

6 Pages·1991·0.36 MB·English

by  J. L. Barnard

30 September 1991
Memoirs ofthe Museum ofVictoria 52(2): 277-282 (1991) ISSN 0814-1827
https://doi.org/10.24199/j.mmv.1991.52.04
NEPELLE NELEJU, A NEW GENUS AND SPECIES OF MARINE AMPHIPOD
FROM AUSTRALIA (CRUSTACEA: AMPHIPODA: UROHAUSTORIIDAE)
By J. L. Barnard1 and M. M. Drummond2
'Department ofInvertebrate Zoology, NHB-163, Smithsonian Institution, Washington, DC, 20560, USA
•department ofCrustacea, Museum ofVictoria, Swanston Street. Melbourne, Victoria 3000, Australia
Abstract
Barnard, J.L. and Drummond, M.M., 1991. Nepelle nelera, a new genus and species of
marine amphipod from Australia (Crustacea: Amphipoda: Urohaustoriidae). Memoirs of
the Museum ofVictoria 52: 277-282.
A newgenusand speciesofmarineurohaustoriid amphipod, Ncpcllcnelera, isdescribed
fromTasmania. Itdilfersfrom itssympatriot, Gheegerus, inthemuch moremodified coxae
1-2, cleft and bell-shaped telson. setose epimcron 1 and large tooth on male antenna 2.
ofposteriorsetae, long plumes, subvcntral clus-
Introduction ters of simple setae (called glassy spines) and a
The Urohaustoriidae of Australia were row ofbulbar penicillate setulcs, article 5 with
treated by Barnard and Drummond (1982). long plumes, weak glassy spines, no bulbars,
That work was based mainly on materials col- facial armament rows on articles 4-5 composed
lectedfromWestern Portand Port PhillipBayin of very slender setae and spinules; article 5 in
Victoria. The new genus described here was male with large anteroapical claw-like tooth
found in Tasmania, across the strait from Vic- pointing medially. Mandibular incisors ex-
toria. South Americangeneraofthefamily were tended, of ordinary thickness, barely toothed,
summarized in the kev of Clark and Barnard essentially with 2 teeth; lacinia mobilis narrow
(1986). and spike like, blunt on right, sharp on left;
Methods ofmorphological description follow rakers 2, only first raker serrate; molar large,
those ofBarnard and Drummond (1978, 1982). extended, with accessory chopper; setae ofpalp
Upper case letters refer to parts; lower case let- article3weaklyawned,apicallybent. Innerplate
terstoleft ofuppercaselettersrefertospecimens of maxilla 1 of medium length, narrow, with 2
noted in legends; lower case letters to right of apical setae, outer plate with 1 1 spines, palp
uppercase refer to adjectival modifications in short, uniarticulate, with 3 large apical setae.
list below: A, antenna; B, body; C, coxa; D, Innerplateofmaxilla2withweaklysubmarginal
dactyl; G, gnathopod; H, head; I, inner plate or row ofsetae. Palp article 2 ofmaxilliped extra-
ramus; K, pleopodal coupling hooks; L, labium; ordinarily elongate, expanded, dactyl barely
M, mandible; O, outer plate or ramus; P, pereo- clavate, elongate, bearing 3 apical setae.
pod; S, maxilliped; T, telson; W, plcon; X, max- Coxae 1-2 very small, first pointed, second
silelta;aeY,repmleoovpeodd;;td,,ldeoftr.sal;p.posterior; r, right;s, bsbllhuuannptte,darmcrooosxwtahe3oa,fdc;coocxxoaax4a2ela2hr-gi5edrdwetihntahnbsy3i,mlpsalhrgeaep,seadca-dllziiekk-ee
Urohaustoriidae Barnard and Drummond, gills, gill 5 smallest; oostegites thin, strap-
1982 shaped.
Gnathopods small, grossly alike, carpi
Nepelle gen. nov. elongate, propodi somewhat smaller, mitelli-
Diagnosis. Rostrum short and broad, head form, first simple, second minutely chelate.
poorly extended antcriad from antennal notch. Dactylsofpereopods 3-7distinguishablebuton
Antennae ofhaustoriid (versus urothoid) form, pereopods 6-7 often hidden among similar
tagehnnudisc3pueloadftuenp,celdbeuontochflaefnltapgerenolgnlaraesm1sosidhvoeerrltay,tssethlooyurtt,leoannrget.di,clAenesost-2 bpslpeairdneeeo-slp,ioktdehs,os6se-pi7onfovsepere.yrAesrmotapilocldl;esda53c-to5yflploaerfrgeep,oeprtoehdoospsoe3d-o4f5
thetascs simple. Antenna 2 of full haustonus fully spinose posteriorly. Article 2 ofpereopods
f4o-r5mw,iatrhtifcalceia4leaxrpmaanmdeendt,sa,rtairctliecl5es4mwailtl,ha3rktiicnldess t5h-a7neoxnpa5nadnedd7;budtistlaelssarsttircolnegsloyfopnerpeeorpeoodpso6d-76
277
278 J. L. BARNARD AND M. M. DRUMMOND
scarcely widened, on 5 much more expanded; Diagnosis. With the characters of the genus.
pereopods 6-7 otherwise similar, not dominat- Description. Male "h", 4.95 mm; head about
ing pereopod 5. 70%aslongaswide, rostrum about 6%aslongas
Pleopod 1 strongly dominant in setation and remainder of head, eyes represented by their
articulation, inner ramus shorter than outer.
attendant ganglia, actual ommatidia or pigment
dEopmiimncarnotnlyI septroessee,ntepainmdersoentos3e;deopmiimnearnotn i2n not discerned. Dorsal setae on article 1 of
antenna medial =3 regularand 2 bulbar-peni-
size. Urosomites 1-2 produced laterally. Rami cillate, me1d,ial margin = 6 setae in facial row and
of uropods 1-2 evenly sublinguiform, widely
apical clusterofseveral;article 2with manydor-
setosemediallyand apically, poorlyornot setose
laterally, peduncles moderately setose. Uropod sal setae, medial row of many setae; primary
flagellum with 10 articles, accessory flagellum
3 with rami extending subequally, well setose
marginally except on outer margin of inner with 9 articles. Article 3 of antenna 2 with 5
ramus. Telson short, broader than long, basally medium setae; facial formulaofspineson article
expanded and somewhat bell-shaped, cleft 4 = numerous thin setae and spinules in jagged
halfway. row; article 5 = 12 main setae dorsally (actually
dorsal edge pointing medially) and facial row
Description. Eyes absent, ocular ganglia visible. similar to article 4: flagellum with 1 1 articles.
Dorsomedial surface of article 1 on antenna I Right and left mandibular incisors with 2
furnished with small, poorly organized group of weak teeth each;article 3 ofpalpscarcely shorter
setae; article 2 strongly setose dorsally; article 3 than article 2. latter with 8 setae, setal formula
poorly setose. Article 3 of antenna 2 short, on left and right article 3 = 1-1-1-8. Innerplate
sparsely setose, flagellum slightlylongerthan ar- ofmaxilliped with 2 stout apical spines,oneven-
ticle 4 of peduncle. Calceoli absent. Lower lip tral locking spine, and 7 apical setae; medial
with one cone on each outer lobe, mandibular margin of outer plate with ragged mixture of
lobes well developed. Several spines on outer spines and scattered small setae, apex with 1
plate ofmaxilla 1 bifid ortoothed. Gnathopod 2 seta; article 2 ofpalpwith row of 14 mediofacial
lacking surficial buttons. setae: article 3 with rowof7 medial facial setae,
Type species. Nepcllc nelcra sp. now Unique. 2 groups lateral setae.
Coxa trapezoidal, bearing 4 setules on ven-
Etymology. An Aboriginal spirit. tral margi1n, coxa 2 subcortical and weakly bent.
Relationship. Thisgenus is very similarto Ghee- anterior margin convex, with 1 ventral setule
gems Barnard and Drummond (1982) but dif- nearapex,coxa3adze-shaped,with about 6 ven-
fers in the pointed coxa 1, the cleft telson with tral setae on narrow margin and about 10 setae
bell-shape, the presence ofsetae on epimeron 1, on lower part ofconcave posterior margin, coxa
a2nadrethveerlyardgiesttionoctthivoenbmeaclaeusaentiennGnhaee2.geCrouxsaethe1-y o4nwevaeknltyrala,ndpobsltuenrtiloyr,arurpopwe-rshaipnevda,giwnealtledsetaonsde
are much moreevenly rectangular. The shape of upper lobed margins, coxae 5-6 well setose pos-
thetelson isstronglydistinct. Bythosestandards teriorly, coxa 7 inferior and poorly setose.
within the family, this entity represents a dis- Setal and spine formulason pereopod 3= 8-7,
tinct genus even though it and Gheegerus are 13. 6-7. 6-1-4, and pereopod 4 = 6-5, 12, 5-6,
monotypic. 6-1-4. Article 2 of pereopods 5-7 well setose
posteriorly, pereopod 5 with long mediofacial
row ofsetae; dactyl ofpereopod 5 with pair of
Nepelle nelcra sp. nov. apical spines and 4 anterior marginal spines.
Peduncular spine formulas ofpleopods 1-3 =
Figures 1-3
2 and 1, 2 and 0, 2 and 1; segmental formulas =
30-19,22-16, 18-15;basal setal formulas= 18-
oMtahteerrimailxeexdamsipneecdi.men2sm.ales, I female, 1 juvenile, 18 6-6-6, 11-2-4-4, 8-2-3-4, each inner ramus
Holotype: Tasmania, Eddystone Point, D. Hoggins, withcomplexbasal bifid spinewith doublebarb,
Aug 1978, Museum ofVictoria (NMV) J17654 (male posteriorfacesofpeduncles withsetsofmedium
"g", 4.95 mm, illustrated). facial setae, lateral and medial = 0-1, 0-2 6-
NMV
4.7P5armamty)p;esN:MTyVpeJ1lo7c6a5li7ty(,male "Nh"JM,1V756.5053 (mfme)m;alNeM"fV', 2. Epimeron 1 rounded, with 3 facial setae
J17658(juvenile"i", 2.58mm); J17656(18spe- posteroventrally;epimeron 2 extended intopos-
cimens). teroventral tooth, posterior margin "crimped,"
NEPELLE NELERA, A NEW MARINE AMPHIPOD
279
Figure 1. Nepelle nelera, unattributed figures = holotype male g, 4.95 mm; f= female 4.75 mm.
280 I. I . liARNARI) AND M. M. OKIIMMONI)
Figure 2. Nepelle nelera, holotype male "g", 4.95 mm. ah setae not shown on pleoppod.
NEPELLE NELERA, A NKW MARlNi; AMPHIPOD 2X1
Figure 3. Nepelle nelera, holotypc male "g", 4.95 mm.
282 J. L. BARNARD AND M. M. DRUMMOND
face with 10setae in semicircleof7 and set of3; peduncle uropod 1, 3 lateral, 2medial, nodorsal
epimeron 3 sharply and strongly produced pos- setae,ofuropod 2 = 1 lateral, nomedial; setaeof
teroventrally. outer rami, uropod 1 = 2 lateral, 2 apical, 5
Lateralmarginofpeduncleon uropod 1 with4 medial, of uropod 2 = 2 lateral, 2 apical, 4
setae,ofuropod 2with 1 seta,ofuropod 3with 1 medial; inner rami, uropod 1 = 1 apical, 3
spine. Uropod 3 with several ventral setae at medial, ofuropod 2= apical, 2 medial; uropod
1
base of outer ramus. Apicomedial corner of 3outerramus=51ateral, 3 medial, innerramus=
peduncle on uropod 1 with 4 setae, ofuropod 2 2apical,4medial;telsonwith 2apical setaeeach
with 4 setae; uropod 1 with 3 large dorsomedial lobe.
setae; inner rami of uropods 1-2 extending 85
as5entodane6o7inn%nmeeardlioranalgmumosuat.regrAi;pniuocrfaolepaocsdehstoaue1t-eo3rnwriaotmuhtues6r,,44a,,n3d4, oEwftoyramdnotl"eopngonyian.t2iLnpagotbiinontinizene"gdrievnfeewrrasrriidnognttooorftehseAebomodbrdliegtiefneoatrlh-
inner rami ofuropods 1-3 = 3-1, 3-1, 2-2. ceps.
Telsonabout 1.3timesaswideaslong,weakly Distribution. Tasmania, EddystonePoint,depth
alatebasolaterally(thussomewhat bell-shaped), unknown.
cleft about 50%ofits length, each apex with 2-3
mediumplumes,eachsidewithsmallpenicillate
setule and second asymmetric pair basolater- Acknowledgments
ally. WethankDrGaryC. B. PooreoftheMuseum
Female, "f", 4.75 mm. Differences from male of Victoria for making this material available;
very few: Antenna 1 lacking tooth on article 5 Linda B. Lutz of Vicksburg, Mississippi, USA,
and slightly less setose; on all described parts of for inking our drawings; and Elizabeth
male pleon, femaledifferingonly byepimeron Harrison-Nelson forlaboratoryassistanceat the
1
bearing only 1 seta and peduncle of uropod 1 Smithsonian Institution.
with only 3 (versus 4) lateral setae; pereopods
lessspinose, forexample,article4ofpereopod 4
with 8 and 3 anterodistal setae, article 5 with 10 References
anteriorsetae, 6 facial spinesand 3 + 3 posterior Barnard,J.L.and Drummond, M.M., 1978.Gammar-
marginal spines, formula on article 6 = 5-3-1. idcan Amphipoda of Australia, Part III: The
.Juvenile, "i", 2.58 mm. Generally much less ZPohooxloocgeyph24a5l:ida1-e5.51S.mithsonian Contributions to
setose as detailed below, principal oddity being Barnard,J.L.andDrummond,M.M., 1982.Gammar-
shortened inner ramus of uropod 1, extending idean Amphipoda of Australia, Part V: Super-
only 60% as far as outer ramus. familyHaustorioidca.SmithsonianContributions
Examples of lesser armaments: Pereopod 3, to Zoology 360: 1-148.
anteriorapical setae 7-2, article 5 anteriorsetae Clark. J. and Barnard, J.L., 1986. Tonocote, a new
- 7, posterior spines 6-2, article 6 spines = genus and species ofZobrachoidae from Argen-
5-3-1; pereopod 4 article 5 posterior spines = tina (Crustacea: Marine Amphipoda). Proceed-
5-4; epimeron 1 with 1 seta, epimeron 2 = 6; i2n2g5s-2o3f6t.he BiologicalSociety of Hashineton 99-