Curidia magellanica, new species, from Magellan Strait (Crustacea: Amphipoda: Ochlesidae)

10 Pages·1991·4 MB·English

PROC. BIOL. SOC. WASH.
104(2), 1991, pp. 269-278
CURIDIA MAGELLANICA, NEW SPECIES,
FROM MAGELLAN STRAIT
(CRUSTACEA: AMPHIPODA: OCHLESIDAE)
C. O. Coleman and J. L. Barnard
Abstract.—Thenewspecies, Curidiamagellanica,differsfromsimilarspecies,
Curidia debrogania and Ochlesodius spinicornis, in the strong development of
the pointed projections on peduncular articles 1 and 2 ofantenna 1 and the
fourtharticleofantenna2. Thecoxalplatesofpereopods2and 3 ofOchlesodius
spinicornisareapicallytruncate,in Curidiamagellanica, roundedandsubacute,
respectively. Themaxillipedalpalpismuchlongerinthenewspeciescompared
to Curidia debrogania and there are remnants of an articular suture, which
might indicate relationships to the genus Ochlesodius. The classic genus Odius
is an analogous morph in the Iphimediidae with many characters that might
be considered plesiomorphic to the Ochlesidae; it has been relegated to a new
family Odiidae by Coleman & Barnard (1991).
ThegeneraandspeciesofthefamilyOch- ordinary. Lateral cephalic lobes well devel-
lesidae are reviewed for the first time since oped.
its description by Stebbing (1910). A new Mouthparts grouped conically. Labrum
diagnosisofthefamilyispresentedbyCole- elongate. Mandibular incisors moderately
man &Barnard (1991), who also discuss its broad, smooth or weakly crenulate in mid-
relationship to many similar families; here, dle,eachend(side)boundedbysmalltooth;
a complete description ofthe family is pre- left mandible with spiniform lacinia mobi-
sented. Newkeysforidentification andlists lis,rightabsentorrepresentedbysmallcon-
ofspecies are provided herein. The lists of ical spine; palp 3-articulate, article 1 elon-
speciespresenteachspecieswithitsdescrib- gateornot; rakersabsent; molarverysmall,
er and date followed in parentheses by one poorly triturative or simple. Mandibular
or more modem references, followed by lobesoflabiumacuminate, innerlobesweak
geographical codes for distribution set in or absent. Inner plate ofmaxilla 1 small or
brackets; a list of these codes is found in indiscernible, outerplate subconical, spines
&
Barnard Barnard (1983:181-203). mostly fused to base, palp vestigial though
oftenarmedwithlongseta. Lobesofmaxilla
Ochlesidae 2 elongate, inner shortened. Inner plate of
maxilliped acuminate, outer operculiform;
Ochlesidae Stebbing, 1910:581.—Coleman
& palp small, 0-2 articulate.
Barnard, 1991:259.
Anterior coxae acuminate or oddly
Description. —Body massive, com- shaped: coxae 1 and 4 shortened relative to
pressed, one or more segments usually with long and thin coxae 2 and 3, coxa 3 with
largedorsal tooth. Head short from front to posterodorsal buttress forming attachment
rear,buttall, partiallyenvelopedbypereon. to pereon; coxa 5 shorter than 4. Gnatho-
Rostrum large. Antennae short but thick, pods feeble, gnathopod 1 simple or mi-
notlongerthan 5 pereonites, flagellasparse- nutely parachelate, gnathopod 2 simple or
lyarticulate,accessoryflagellumabsent.Eyes subchelate, otherwise gnathopod 2 with
.
270 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
produced carpus and/or merus; articles 3- fashionthattheanteriorcoxaehaveajagged
6 ofgnathopod 1 slender, elongate, apical appearance. The dorsal keel ofthe six an-
setae usually strap-shaped or grossly feath- teriorthoracicsegmentsalsoisfoundinsev-
ered. Article 2 of pereopods 5-7 well ex- eralmembersofAcanthonotozomatidaeand
panded, with posteroventral lobe. Gills on in the genus Dikwa (Dikwidae), but in all
coxae 2-7, narrow, or apically geniculate; ofthose, one or more ofpereonites 1-6 has
oostegites narrow and broad together in a dorsal tooth.
same species, thus narrow on coxae 2 and See Coleman & Barnard (1991) for ad-
5 but broad on coxae 3-4 or also broad on ditional comments on more remote taxa.
coxa 2 in another species. Pleopods ordi-
nary. Epimera toothed or not.
Key to the Genera ofOchlesidae
Urosomites separate. Uropods 1-3 bira-
mousbutouterramiofuropods2-3 shorter 1 Palp ofmaxilliped 2-articulate . . .
than inner; peduncle ofuropod 3 elongate, Ochlesodius
thus longer than urosomites 2-3 together, - Palp ofmaxilliped 0-1 articulate .. 2
innerrami ofuropod 3 aslongas orslightly 2. Body keel dorsally flattened, with
shorterthanpeduncle, flattened, lanceolate, plaques, pereonites with lateral
outer ramus 1-articulate. Telson entire or plaques, telson linguiform, lateral
weakly incised, variable in size and shape. margins curled upward Meraldia
Variables.—Body narrowing dorsally to - Bodykeeldorsallyknife-like,pereo-
thin continuous keel or segments forming nites smooth laterally, telson flat 3
. .
flattened dorsal pedestals. Antennae cus- 3. Palp ofmaxilliped absent .... Ochlesis
pidate or not. Epistome and labrum highly - Palp ofmaxilliped 1-articulate . . .
variable, broad or narrow, long or short, Curidia
incisedorentire. Coxaevariable. Dactylsof
pereopods3-7elongate{Ochlesisinnocens),
Key to the Species ofOchlesidae
orshort{Ochlesislenticulosus).Telsonshort
or elongate, leaf-shaped or long and trun- 1. Body keel dorsally flattened, with
cate. plaques, pereonites with lateral
—
Relationship. Ochlesidae difler from plaques, telson linguiform, lateral
Iphimediidaein(1)theproducedmerusand margins curled upward
carpus ofgnathopod 2; (2) the reduction of Meraldia meraldi
the maxillipedal palp to fewer than 3 arti- - Body keel dorsally knife-like, per-
cles; (3) the reduced antennal flagella; (4) eonites smooth laterally, telson flat
theslenderkeel-likenarrowingofthedorsal 2
margin of pereonites 1-6, which also lack 2. Coxae 1-3 not tapering, blunt or
teeth; and (5) the peculiarthough internally truncateapically,palpofmaxilliped
diverseformsoftheanteriorcoxae, inwhich with 2 articles Ochlesodius spinicornis
.
coxa 4 is strongly shortened, coxa 1 is dis- - Coxae 1-3 tapering, rounded or at-
parately shortened, and coxa 4 occurs in tenuate apically, palp ofmaxilliped
grotesque shapes. The shortened condition with 0-1 article 3
ofcoxa 1 is ofincremental degree, in that 3. Coxa 4 not excavate posteriorly,
the shortened coxa 1 of Iphimediidae re- body with at least one large dorsal
mains within the smooth parabola formed tooth 4
by the lower edges ofcoxae 4, 3, 2, and 1, - Coxa 4 excavate posteriorly, body
whereasin Ochlesidae, coxae 2 and 3 are of lacking large dorsal teeth 7
equal length; no parabolic curve with coxa 4. Epimeron 3 with tooth 5
4 is possible because itis shortened in such - Epimeron 3 lacking tooth 6
VOLUME NUMBER
104, 2 271
5. Pleonites2-3 onlywithdorsalrugae Marine, Caribbean Sea, Belize, 6 m, and
Ochlesis innocens Magellan region, 92-101 m, 2 species.
- Pleonites 2-3 with strong dorsal
tooth Ochlesis lenticulosa
6. Pereonite 7 and pleonites 1-2 with Meraldia Barnard & Karaman
strongdorsaltooth, teethpresenton Meraldia Barnard & Karaman, 1987:857
antennae 1-2 Ochlesis carinata {Ochlesis meraldi J. L. Barnard, 1972,
- Only pleonite 3 with strong dorsal original designation).
tooth, teeth absent on antennae 1-
—As
2 Ochlesis eridunda Diagnosis. in key.
7. Antennae and epimeron 3 lacking Species.—Meraldia meraldi (J. L. Bar-
significant teeth ....Ochlesis levetzowi nard, 1972) southern Australia [785].
- Antennae and epimeron 3 with sig- Marine,PearsonIslands,SouthAustralia,
nificant teeth 8 35 m, 1 species.
8. Teeth of antennae small, palp of
maxilliped absent Ochlesis alii Ochlesis Stebbing
- Teeth ofantennae medium to large,
palp ofmaxilliped 1-articulate .... 9 Ochlesis Stebbing, 1910:581 {Ochlesis in-
9. Palp ofmaxilliped shorter than ba- nocens Stebbing, 1910, monotypy).
solateral margin ofouter plate, fla- Diagnosis.—As in key.
gellum of antenna 1 as long as ar- Removal—Ochlesis meraldi J. L. Bar-
ticles 1-2 of peduncle, coxa 3 nard, 1972, to Meraldia.
expanded distally from coxa 4, an- Species.—OchlesisaliiJ. L. Barnard, 1970
terodorsalhumpofcoxae3-4 small, (?(9. innocensIDofPirlot, 1936 and?Schel-
pereonite 7 longer than pereonites lenberg, 1938), Hawaii and Indonesia [381
4-6 together, teeth of antennae of + ?640]; O. carinatus Ledoyer, 1986, Wal-
medium length . . . Curidia debrogania ters Bank, bathyal [725wB]; O. eridunda J.
- Palp of maxilliped longer than ba- L. Barnard, 1972, southern Australia [785];
solateral margin ofouter plate, fla- O. innocens Stebbing, 1910, southeastAus-
gellumofantenna 1 aslongasarticle tralia [781]; O. lenticulosus K. H. Barnard,
1 ofpeduncle, coxa 3 not expanded 1940 (Griffiths 1974b, 1974c, 1975), south-
distally from coxa 4, anterodorsal em Africa [743]; O. levetzowi Schellenberg,
hump ofcoxae 3-4 large, pereonite 1953 (Griffiths 1974a, 1974c), southernAf-
7 not longerthan pereonites 5-6 to- rica [743].
gether, teeth ofantenna long Marine, Indo-Pacific from Hawaii to
Curidia magellanica southern Australia and southern Africa, 0-
200 m, 6 species.
Curidia Thomas
Curidia Thomas, 1983:127 {Curidia debro-
Ochlesodius Ledoyer
gania Thomas, 1983, original designa-
tion). OchlesodiusLedoyer, 1982:48 {Ochlesodius
spinicornis Ledoyer, 1982, original des-
Diagnosis.—Like Ochlesisbutmaxilliped
ignation).
with 1-articulate palp.
Species.—C. debrogania Thomas, 1983, Diagnosis.—As in key.
—
western Caribbean [471]; C. magellanica Species. Ochlesis spinicornis Ledoyer,
Coleman & Barnard, herein, Magellan re- 1982, Madagascar [698].
gion [864]. Marine, Glorieuses, 26 m, 1 species.
272 PROCEEDINGSOFTHEBIOLOGICALSOCIETY OFWASHINGTON
on right mandible; pars molaris small, cup-
Curidia magellanica, new species
likeweaklytriturative;palp 3-articulate, ar-
Figs. 1-4
ticle 1 slightly expanded distally, 0.82 as
USNM
Material. —B.o\otypQ, 253546, long as article 2, article 2 longest, article 3
female 2.4 mm, with setose oostegites; 0.91 as long as article 2, curved ventrally,
USNM 253547, 34 paratypes. with linearcomb row, apicallywith 3 short
Type locality.-Eltanin St. 958 (52°56'S setae. Hypopharynx (Fig. 21): slender, long
75°00'W), Magellan region of south Chile; andnarrowapices. Maxilla 1 (Fig. 2a): inner
5 Feb 1964; depth range 92-101 m; gear: 5' plate small, outer plate styliform with 5-6
Blake trawl. spine-like setae distomedially; palp uniar-
Etymology.—ThQ species name refers to ticulate, short with long seta distally. Max-
the type locality. illa 2 (Fig. 2b); innerplate widerthan outer
Description.—Body strongly compressed platewith 8 setaedistally; outerplatelonger
laterally, sharply ridged dorsally as shown thaninnerplatewith 1 setaedistally. Max-
in Fig. la; pereonite 1 forming a rostrum- illiped (Fig. 2c): inner plate slender, long
like anterior process; pereonite 2 shortest; (70%ofouterplate), spine-likesetaapically,
pereonite 7 longest, posterodorsal margin row ofsetae on medial margin; outer plate
forming a tooth; pleonites 1 and 2 postero- rounded distally with several setae subapi-
lateral margin roundly produced, postero- cal; palppresent, uniarticulate (remnants of
ventralangleofepimeraproduced, postero- former articular suture visible under high
dorsal margin slightly produced; pleonite 3 magnification), 1 long and 1 short incon-
withdorsalhump, posteroventralmarginof spicuous setae terminally.
epimeron 3 with pointed tooth, urosomite Gnathopod 1 (Figs, la, 3a): coxa much
1 longest; urosomite 2 shortest. Head par- shorter than coxa ofpereopod 2 (65%), ta-
tially hidden by pereonite 1, eyes with 17 pering distally; basis elongate, slightly lon-
to 22 ommatidia, lateral cephalic lobe gerthanischiumandmerustogether;carpus
pointed anteriorly; rounded epistomal pro- andpropodussubequalinlengthandwidth;
cess between antennae 2. propoduswith some setae distally; dactylus
Antenna 1 (Fig. lb): article 1 broad, lon- with some plumose setae andone stoutseta
gerthan 2, withventromedial acute process posteriorly. Gnathopod2(Figs, la, 3b): coxa
exceeding first third offirst flagellar article; elongated, rounded distally, anteroproxi-
article 2 with similarprocessexceedinghalf mal angle overlapping coxa 1; basis elon-
offirstflagellararticle; article 3 shorterthan gate, ischium shorter than merus; postero-
flagellar article 1; accessory flagellum ab- distalangleofmerusbearingprocess;carpus
sent; flagellum consisting of three articles, longer than propodus, increasing in width
article 1 longest with aesthetascs ventrally. distally, withsetaeonposterodistalprocess;
Antenna 2 (Fig. Id): subequal in length to dactylusstout, bifidwithclawanteriorly(see
antenna 1;article2withsubacuteglandcone; detail ofFig. 3b).
articles 2 and 3 subequal in length; article Pereopod3 (Fig. 3c): anteroproximalpart
4 with long acute medial process almost ofcoxa rounded, overlapping coxa 2, pos-
reachingdistal marginofpedunculararticle teromarginal rounded process, coxa taper-
5; article 5 as long as flagellum; flagellum ing distally to subacute tip; basis slightly
consisting of3 articles. increasing in width distally; ischium short
Labrum(Fig. 1c): elongated, taperingdis- and broad; merus with anterodistal acute
taUy; epistome forming keel-like process. process (carpusto dactylus missing). Pereo-
Mandible (Fig. 2d, e): styliform; incisor pod 4 (Fig. 4a): coxa broad, anteriorly and
simple, very small, with cutting edge, slen- posteriorly excavate, overlapping coxa 3
derlaciniamobilis onleft mandible, absent proximally; basis simple; merus similar in
VOLUME NUMBER
104, 2 273
Fig. 1. Holotype ofCuridia magellanica n. sp., female 2.4 mm. a, lateral habitus; b, antenna 1; c, labrum;
d, antenna 2.
shape as to pereopod 3; carpus increasing marginally; dactylus stout with terminal
in width distally with some spine-like setae claw. Pereopod 5 (Figs, la, 4e): coxa very
posteromarginally, anterodistal angle broad, anteroproximal comer produced,
slightly produced; propodus longer than overlappingcoxa4; basisbroadwith incon-
merus, with some spine-like setae postero- spicuous ridge on lateral face, overlapping
274 PROCEEDINGSOFTHE BIOLOGICALSOCIETY OFWASHINGTON
Fig. 2. HolotypeofCuridia magellanican. sp., female, 2.4 mm. a, maxilla 1; b, maxilla2; c, maxilliped;d,
leftmandible; e, right mandible; f, partofhypopharynx.
ischium andmerus with posterodistal lobe; anteroproximally lobate; basis similar in
merus broad with posterodistal process shapetopereopod 5 butslightlylonger, me-
(carpus to dactylus damaged during dissec- rus broad with acute posterodistal process;
tion). Pereopod6 (Figs, la, 4b): coxabroad- carpus longer than merus, increasing in
er than long, slightly excavate posteriorly, width distally, posterodistal angle slightly
VOLUME NUMBER
104, 2 275
Fig. 3. HolotypeofCuridiamagellanican. sp.,female,2.4mm.a,pereopod 1;b, pereopod2,detailshowing
dactyluswith claw; c, pereopod 3; d, uropod 1; e, uropod 2; f, uropod 3, from ventral side.
produced; propodus longest with some pods 5 and 6 butbroader, anteromarginally
spine-like setae anteromarginally; dactylus sinuoid; ischium, merus, carpus and dac-
stout with terminal claw. Pereopod 7 (Figs, tylus as for pereopod 6.
la, 4c): coxa small, with posteromarginal Gills present on coxae 2-7 slender, weak-
excavation; basis similarin shape to pereo- ly sac-like but on pereopod 7 as long as
276 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
Fig. 4. HolotypeofCuridia magellanican. sp., female, 2.4 mm. a, pereopod 4; b, pereopod 6; c, pereopod
7; e, pereopod 5. Paratype, ovigerousfemale, 2.9 mm. d, telson.
broad. Oostegites on coxae 2-4 broadly ex- beyonduropods2and 3,peduncleelongate,
panded distally rounded, oostegite ofcoxa longerthan rami, with row ofspiniform se-
,
5 short and slender. tae dorsolaterally; rami subequal in length,
Uropod 1 (Figs, la, 3d): slightly reaching somespine-likesetaeonbothmargins.Uro-
VOLUME 104, NUMBER 2 277
pod 2 (Figs, la, 3e): peduncle subequal to pared to Curidia debrogania and there are
inner ramus, length of outer ramus % of remnantsofanarticularsuture,whichmight
inner ramus, rami with spine-like setae on indicate relations to the genus Ochlesodius.
both margins. Uropod 3 (Figs, la, 3f): pe-
duncle stout; innerramus longerthan outer
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