Echinodermata, Ophiuroidea, Gorgonocephalus Leach, 1815: First Report of the Genus for the Brazilian Istributio
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ISSN 1809-127X (online edition) © 2010 Check List and Authors Chec List Open Access | Freely available at www.checklist.org.br Journal of species lists and distribution N Echinodermata, Ophiuroidea, Gorgonocephalus Leach, 1815: First report of the genus for the Brazilian ISTRIBUTIO D continental margin RAPHIC G Carlos A. M. Barboza 1*, Fabricio M. Mendes 2, Andrea Dalben 3 and Luiz R. Tommasi 2 EO G N O 1 Universidade Federal do Paraná, Programa de Pós-graduação em Zoologia, Centro de Estudos do Mar, Laboratório de Bentos - Av. Beira-mar s/n. CEP 83255-000. Pontal do Paraná, PR, Brazil. OTES 2 Fundação de Estudos e Pesquisas Aquáticas – FUNDESPA Av. Afrânio Peixoto, 412, Butantã. CEP 05507-000. São Paulo, SP, Brazil. N 88040-970. Florianópolis, SC, Brazil. * 3 Corr Universidadeesponding Federal author. de E Santamail: [email protected], Departamento de Ecologia e Zoologia, Laboratório de Biogeografia e Macroecologia Marinha. CEP Abstract: Gorgonocephalus chilensis The Gorgonocephalidae includes 38 genera, five of themGorgonocephalus reported for genusBrazilian for w theaters. Brazilian continental margin andhas aextend wide distrib the northernution thr limitoughout of distribution Antartica andof G. Subantartican chilensis to the regions coast of and Santa its northern Catarina. limit Tolerance was restricted to a large t otemperature the coast of andUruguay. bathimetric This work range aims are to crucial report tothe understand first occurr theence distributions of the patterns of ophiuroids from the polar circle that also occur at southern South America. - - tober 2004 and totalized 130 hours. One single specimen (PatersonThe Gor 1985;gonocephalidae Rosenberg familyet al. 2005).has a w Theorldwide family distri com- of G.Sampling chilensis was conducted by SCUBA diving during Oc bution and occurs from shallow waters to the deep ocean (Gorgonacea) octocoral at 21 °C and 20 m depth. This reported as belonging to the Brazilian continental mar- was collected associated with the Ellisidae gin:prises Astrotoma 38 valid agassizii genera inLyman, which 1875, only Astrocyclusfive of them caecilia were Museu de Zoologia of the Universidade de São Paulo, São Astrophyton muricatum Paulo,specimen Brazil was (MZUSP–18.185). stored at the echinoderm collection of the Astrochele lymani Verril, 1878 and Astrogomphus vallatus - (Lütken, 1856)Gorgonocephalus, genus includes(Lamark, ten species1816), - (Stöhr and O’Hara 2007) and its northern limit distribu- The disk diameter of the specimen is 28 mm and dor Lyman, 1869. - havesally coa coatingvered b ofy a granules thick skin (Figure (Figures 2C). 2A The and oral 2B). surface The radi are guay. Gorgonocephalus chilensis has been recorded from coveredals shield by ar smalle bar-lik granulese reaching that theare middlesmaller of them the diskthose and of Antartiction in the Peninsula, South Atlantic Ross w Sea,as restricted Kerguelen to the Islands, coast ofHeard Uru Gorgonocephalus conspicuousthe radial shiel andds contain(Figure small2D). granulesThe jaws alongare armed each marwith- genusIsland, forChile, the ArBraziliangentina, continental Uruguay and margin New andZealand. extended This gin.spine-like The slits mouth are localized papillae at(Figur the basee 2D). of Genitaleach arm slits on theare thework northern reports limitthe first occurrence occurrence of G. of chilensis the to the coast of The Arvoredo Island is located in the southern coast Santa Catarina, Brazil (27°17’16” S, 48°20’56”2 of land W).in a marine protected area (Figure 1). The region hydrodynamic fea- of Brazil with an extension of 2.7 Km turese ar stronglyet al.influenced 1998; Carbonel by the Superficialand Valentin Tropical 1999; Water (STW) and by theet al.South Atlantic Continental Water m(SACW) depth) (Viana is the result of the convergence of the Tropical Rossi-Wongtschowski 2006). The STW (0 to 250/300- Water (TW), the Litoral Water (LW) and of periodic up depthwelling (Viana phenomena et al. of the SACW, which has a temperature- range between 6 and 18 °C flowing between 300 to 500 m- 1998). The Intermediate Antartic Wa Figure 1. Northern coast of Santa Catarina and Arvoredo Island mterW) depth (IA in has the a study high degrarea.ee of dissolved oxygen, tempera tures between 2 and 6 °C and flows between 500 to 1,200 Check List | Volume 6 | Issue 2 | 2010 289 Barboza et al. | Echinodermata, Ophiuroidea, Gorgonocephalus Leach, 1815 ventral interadial area (Figure 2E). The arms are densely the morphology of the arm spines of G. caputmedusae and Gorgonocephalus articus is a possible result of a common granulated and the first branch, of the total of five, occurs - at the distal edge of the disk. Arms spines are modified- origin and so deserving the keeping G.of chilensisa same arefeeding also into microscopic pointed hooks (Figure 2F) forming rings strategy for the capture of macroscopic plankton like co around the arms. The first two tentacle pore have no ten feedingpepods. strategyProbably of the Gorgonocephalus hooked spines species.of tacle scales associated with it and the follow ones has two usedo Distribution t feed plankt patternson or ganismsof Antarctic suggesting echinoderms a common spe- to four scales that increases towards the distal segments. cies can be related to marine currents and the capability of thatthe larv manyae dispersionechinoderms (Pawson species 1994; can travelClarke long and distancesJohnston 2003). Fell (1962) and Smirnov (1990; 1992) pointed out- ered that G. chilensis has smaller eggs sizes and a greater numberassociated of withgonads alg inae relation wisps. Mortto Gorgonocephalusensen (1936) consid eucne- mis evidence suggest that G. chilensis has an indirect develop- , which has a direct development (Patent 1970). This- tribution pattern of G. chilensis can be related to its larvae mentdispersion with acapability. pelagic stage. If this is the case, the wide dis temperature range (Brey et al. Ophiuroids can tolerate a wide depth as well as a continental margins should be 1996),expected so the(Dahm occurr 1999).ence Dahmof Antar (1999)ctic species suggested at South that American the submerged and New ridge, Zealand the Scotia Arc, between the Antarctic Peninsula and South America, is the most likely migration route for eurybathic speciesG. chilensis between the Antarctic region, South America and New Zeeland. Antarctic and sub-Antarctic echinoderms, like , probably have a wide distribution beyond Figure 2. Gorgonocephalus chilensis ofthe the polar distribution circle (P awsonof G. chilensis 1994). andThe supportpresent thereport idea has of important biogeography implications to the knowledge (F). Scales: (A),(B) = 20 mm; (C) = 5 mm;. Aboral (D) view= 3 mm; (A); (E) ador = al2 mm;view (F) (B); = South American echinoderm fauna. 0,05radial mm. shields (C); oral surface and jaws (D); genital slit (E); brachial spine ay closel relationship between Antarctic and the south of Gorgonocephalu chilensis differ from Astrotoma agassi- Acknowledgments: zii, Astrogomphus vallatus and Astrochele lymani due to the Dr. Roberto Ávila andWe Dra. thank Ana DrMaria. Paulo Monteiro da Cunha Gouveia Lana, toMsc. important Maikon presence of branched arms. Gorgonocephalus chilensis also contributionsDi Domenico, toMsc. this V manuscript.erônica Maria de Oliveira, Msc. Walter Cerqueira, differ from Astrocyclus caecilia because the later has no spines or tubercles covering the radial shields. Astrophy- Literature Cited ton species extremely resembles Gorgonocephalus species, - but the former has a more developed radial shields and do Brey,T.,bathy? C. Dahm, Antarctic M. ScienceGorny, M. Klages, M. Stiller and W.E. Arntz. 1996. not have arms spine on the proximal vertebrae of the arms CarbonelDo Antar H.C.A.A.ctic benthic and J.L. in Valentin.vertebrates 1999. sho wNumerical an extended modeling level ofof euryphy- 8: 3-6. (Lyman 1875). Ecological Modeling toplankton bloom in the .up 2003.welling Antarctic ecosystem marine of Cabo benthic Frio diversity. (Brazil). (spines, granules or tubercles) and in the distribution pat- Oceanography and Marine116 (2): Biology: 135-148. an Annual Review 41(2003): 47- The dorsal ornamentation of the disk can vary in shape Clarke,114. A. and N.M. Johnston Dahm, C. 1999. Ophiuroids (Echinodermata) of southern Chile and tern (Mortensen 1936; Monteiro and Tommasi, 1983 a, b).- Scientia Marina Mortensen (1936) observed that juvenile individuals may Fell, Antarctic: H.B Taxonomy, biomass, diet and growth of dominant species. though in adult individuals these spines can be almost to- Hemisphere. Nature 63 (Supl.1): 427-432. tallyhave absent.spines coThevering adult all specimen the dorsal of thissurf studyace of has the sparsely disk al Lyman, T.. 1962.1875. ZoologicalWest-wind-drift results dispersalof the Hassler of echinoderms Expedition II. in Ophiuridae Southern distributed tubercles covering only the radial shields. and Astrophytidae. Illustrated 193: 759-761. Catalogue of the Museum of Compara- tive Zoology (8). London: Cambridge University Press. 34 p. Monteiro and Tommasi (1983 a; b) concluded that the dif- Monteiro, A.M.G. and L.R. Tommasi. 191983a.83a. Ophiuroidea das regi�������es An- ferences belonging to the ornamentation patterns of the tártica e Subantártica, 2. Variação em Gorgonocephalus chilensis (Phi- lippi) (Echinodermata, Ophiuroidea, Gorgonocephalidae). Boletim do Instituto Oceanogáfico da Universidade de São Paulo The arm spines morphology of Gorgonocephalus caput- Monteiro, A.M.G. and L.R. Tommasi. 1983b. Ophiuroidea das