ANEWSPECIESOF CAPRELLA (AMPHIPODA,CAPRELLIDEA) FROM ALGECIRASBA Y,SOUTHERNSPAIN

BY

J.M.GUERRA-GARCÍA, J.E.SÁNCHEZ-MOYANO andJ. C.GARCÍA-GÓ MEZ Laboratoriode Biologí a Marina,Departamento de Fisiologí a yBiología Animal, Facultadde Biologí a, Universidadde Sevilla,Apdo. 1095, E- 41080Sevilla, Spain

ABSTRACT

Anewcaprellid amphipod, Caprellaparamitis n.sp. is described and illustrated based on specimensfrom Algeciras Bay, southern Spain. The new species is verysimilar to C. mitis. Males of C.paramitis aredistinguished from those of C. mitis mainlyby the presence of theshort merus ofthesecond gnathopod, the palm of gnathopod 2 witha proximalspine with crenulated margin all around,and two well-developed ventral tubercles on pereonite 2.

RESUMEN

Se describee ilustraun nuevoanfí podo capré lido a partirde ejemplares encontrados en la Bahí a deAlgeciras,sur de España. Lanueva especie, Caprellaparamitis ,esmuy parecida a C. mitis. Los machos de C.paramitis sediferencian de losde C. mitis principalmentepor presentar el meruscorto enelsegundo gnató podo, la palmadel gnató podo 2 conuna espina proximal rodeada por un borde crenuladoy dostubé rculos ventrales bien desarrollados en el pereonito 2.

INTRODUCTION

Duringthe last decade,the Laboratoriode Biologí a Marina ofthe University ofSevilla has beendeveloping research programmeson amphipod communities in the Strait ofGibraltar (Conradiet al., 1995;Sá nchez-Moyano et al., 1995a,b; Conradiet al., 1997;Sá nchez-Moyano & García-Gó mez, 1998; Conradi & López- González, 1999).The studies werecentred mainly on the faunaassociated with seaweeds andhydroids. In 1992-1993, during a monitoringprogramme of the alga Halopteris scoparia (L.)Sauvageau(see Sánchez-Moyano, unpubl.), a large numberof caprellids, apparentlyclose to Caprella mitis Mayer,1890, were found in Bahía deAlgeciras. Consultationof the literature showedthat these specimens couldbelong to anewspecies. c KoninklijkeBrill NV ,Leiden,2001 Crustaceana 74(2):211-219 ° 212 J.M.GUERRA-GARCÍA ETAL.

Fig.1. Location of Algeciras Bay in the Strait of Gibraltar. The type locality is marked with an asterisk.

MATERIAL AND METHODS Thespecimens of Caprellaparamitis n.sp.were collected bySCUBA diving in shallow waters (3-5metres depth),in the infralittoral zoneof El Cucareo Inlet, Algeciras Bay,southern Spain. The samples wereŽ xedusing formalin 4%in seawater andwere subsequently placed in ethyl alcohol70%. Several specimens weredissected undera stereomicroscope; permanentmounts were made in polyvinyl-lactophenol.All Žgureshave been drawn with the aid ofa camera lucida. CAPRELLAP ARAMITIS NOV. 213

Caprellaparamitis newspecies (Žgs. 2-5)

Typematerial. — Holotypemale, 6.16 mm bodylength, clinging to theseaweed Halopterissco- paria,foundon “El Cucareo”(36 ±70N 5±260W),AlgecirasBay, Cadiz, southern Spain, September 1992,coll. J. E.Sánchez-Moyano. Allotype female, 3.04 mm inbody length, collected together withthe holotype. Paratypes (all of which collected on H. scoparia from“ El Cucareo”): 8males, 1juvenile(December, 1992); 6 males,2 maturefemales (March, 1993); 3 males,3 maturefemales, 3immaturefemales (June, 1993); 4 males,4 maturefemales, 1 immaturefemale (September, 1993). Theholotype, allotype, and some paratypes have been deposited in theMuseo Nacional de Ciencias Naturalesin Madrid(number MNCN 20.04/4653).The remaining paratypes are in the Laboratorio deBiología Marina,University of Sevilla.

Diagnosis.— [Based onmale specimens.] Bodysmooth except for the pres- enceof two well-developed ventral tubercles onpereonite 2. Gnathopod 2 with basis elongated;merus andischium subequal;palm concavewith many setae and aproximalspine borderedby crenulate margin; dactylus curvedproximally. Pere- opods5-7 with 2proximalgrasping spines. Abdominalappendages 1-articulate. Description.— Holotypemale: bodylength 6.16 mm. Head lacking rostrum. Bodysmooth except for 2 well-developedventral tubercles onpereonite2, between the coxaeof gnathopod2. Pereonite 2the longest,pereonites 3,4, and5 subequal. Gills elliptical, differingslightly in dimensions.Those inserted onpereonite 3 longerand wider than the others. Antenna1 c.1.5 times longerthan head. Flagellum 9-articulate. Antenna2, a little shorter thanantenna 1, carrying swimming setae. Upperlip semicircular, symmetrically bilobed,pubescent apically .Innerand outerlobes oflower lip pubescentapically .Incisor andlacinia mobilis 5-toothed. Arowof 3 plumosesetae onleft mandibleand 2 onthe right one.Maxilla 1 outerlobe with 7 forkedspines distally.Palpwith 2articles, the distal onewith 8 thinspines onthe endand a rowof 6 longsetae onthe ventral surface.Maxilla 2 outerlobe rectangular, with longsimple setae onend.Inner lobe elliptical, carrying simple setae onapical margin.Inner plate ofmaxilliped about1/ 2ofouterlobe in length,carrying 2 small teeth and6 plumosesetae onapical margin.Outer plate carrying3 teeth andseveral simple setae. Palp 4-articulate. Basis ofgnathopod1 as longas ischium to carpuscombined. Propodus 3 times longerthan carpus, length c. 1.8 times width.Palm carryinga pair oflonggrasping spines proximally.Dactylus distally biŽd. Gnathopod 2 inserted in the posterior half ofpereonite 2. Basis shorter thanpereonite 2, with a crenulatedcarina on distal ventral margin.Carpus very short. Merus andischium ofapproximatelythe same size. Palm ofpropodus concave, with manysetae anda proximalgrasping spine that has acrenulatedmargin all around.Dactylus stronglycurved proximally. Pereopods5-7 increasing in length,each carrying a pair ofproximal grasping spines. 214 J.M.GUERRA-GARCÍA ETAL.

Fig. 2. Caprellaparamitis n.sp., lateral view. a, male; b, female.Scale bars: 1 mm.

Penes short,situated medially. Abdomenwith apair ofappendages,a pair oflateral lobes,and a single dorsal lobe.The appendages 1-articulate andcarrying 5 short setae onend. Allotypefemale: bodylength 3.04 mm. V entral tubercles onpereonite 2 lacking. Pereonites 2-5subequal. Gills subequalin size. Flagellum ofantenna 1 with CAPRELLAP ARAMITIS NOV. 215

Fig. 3. Caprellaparamitis n.sp. a-d, male; e, female. a, antenna 1; b, antenna 2; c, gnathopod 1; d,malegnathopod 2; e,femalegnathopod 2. Scalebars: a, 0.5mm; b,0.5mm; c,0.2mm; d,0.5mm; e, 0.2 mm. 216 J.M.GUERRA-GARCÍA ETAL.

Fig. 4. Caprellaparamitis n.sp. a-e, male; f, female.a, pereopod5; b, pereopod6; c, pereopod7; d,detailof theventral tubercles; e, male abdomen; f, femaleabdomen. Scale bars: a, b,c, 0.5mm; d,0.5 mm; e,f,0.1mm. CAPRELLAP ARAMITIS NOV. 217

Fig. 5. Caprellaparamitis n.sp., male. a, upper lip; b, lower lip; c, maxilliped;d, rightmandible; e,leftmandible; f, maxilla 1; g, maxilla 2. Scale bars: 0.1 mm. 218 J.M.GUERRA-GARCÍA ETAL.

5articles. Palm ofpropodusof gnathopod2 straight, withoutcrenulated margins borderingthe proximalspines. Basis withoutsmall tubercles onanterodistal margin.Abdomen with a pair oflateral lobes anda single dorsal lobe; without appendages. Etymology.—ThespeciŽ c name paramitis refers to the species’close similar- ity to C. mitis.

REMARKS Thenew species, Caprellaparamitis n.sp., is veryclose to C. mitis Mayer, 1890.Following the descriptions ofMayer (1890), Cavedini (1982), and Krapp- Schickel (1993),the most important differences betweenmales of C.paramitis and C. mitis are: (1)merus clearly shorter in C.paramitis ;(2)the presenceof two well-developedventral tubercles onpereonite 2 in C.paramitis whichare lacking in C. mitis;(3)antenna 1, 1.5times as longas cephalon(head pereonite2) in C C.paramitis versus 2times in C. mitis;(4)peduncular article 2ofantenna 1 is 1.5times as longas article 1in C.paramitis ,twotimes in C. mitis;(5)basis of gnathopod2 alittle longerthan half ofpereonite2 in C.paramitis ,with the same lengthas pereonite2 in C. mitis;(6)the proximalspine onthe palm ofgnathopod 2 is borderedby a crenulatedmargin in C.paramitis ,whichis lackingin C. mitis. Caprella paramitis was foundabundantly on the seaweed Halopteris scoparia . Althoughother stations alongAlgeciras Baywere monitored to studythe fauna associated withthis seaweed, C.paramitis was onlypresent inthe area of“ El Cucareo”. This zoneis characterized bya relatively highsedimentation rate andlow hydrodynamism (Sá nchez-Moyano, unpubl.; Sá nchez-Moyano & García- Gómez, 1998). From a biotic pointof view,the remainingfauna associated with Halopteris scoparia was dominatedby the mollusk Rissoella opalina (Jeffreys, 1848),the annelids Nicolea venustula (Montagu,1818), Platynereis dumerilii Audouin& Milne-Edwards,1833, Amphiglenamediterranea (Leydig,1851), the amphipods Corophiumacutum Chevreux,1908, Gammaropsis palmata (Stebbing &Roberston,1891) and the tanaid Leptocheliadubia (Krøyer, 1842). Eight otherspecies ofCaprellidea werefound living on this substrate, togetherwith Caprella paramitis : C.acanthifera Leach,1814, C.grandimana Mayer,1882, C.liparotensis Haller, 1879, C. penantis Leach,1814, Pariambustypicus Krøyer, 1844, Pedoculinagarciagomezi Sánchez-Moyano, Carballo &Estacio, 1995, Phtisica marina Slabber,1769, and Pseudoprotellaphasma (Montagu,1804). CAPRELLAP ARAMITIS NOV. 219

ACKNOWLEDGEMENTS Wethank CEPSA (Compañ ía Española dePetróleos, S.A),Fundación Sevillana deElectricidad, ExcmoA yuntamientode los Barrios andMancomunidad de Municipios del Campode Gibraltar forŽ nancial support.

REFERENCES

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Firstreceived 7 July2000. Finalversion accepted 10 October2000.