The gastropod-symbiotic sea anemone genus <i>Isosicyonis Carlgren</i>, 1927 (Actiniaria: Actiniidae): a new species from the Weddell Sea (Antarctica) that clarifies the taxonomic position of the genus

Estefanía Rodríguez; Pablo José López-González

doi:10.3989/scimar.2008.72n173

Authors

Estefanía Rodríguez Biodiversidad y Ecología de Invertebrados Marinos, Dpto. de Fisiología y Zoología, Facultad de Biología, Universidad de Sevilla
Pablo José López-González Biodiversidad y Ecología de Invertebrados Marinos, Dpto. de Fisiología y Zoología, Facultad de Biología, Universidad de Sevilla

DOI:

https://doi.org/10.3989/scimar.2008.72n173

Keywords:

sea anemone, Actiniaria, Actiniidae, Endomyaria, Mesomyaria, Antarctica

Abstract

A second species of the sea anemone genus Isosicyonis is described and illustrated from 16 specimens collected in the Weddell Sea (Antarctica) on the Polarstern cruises ANT XVII/3, ANT XXI/2 and ANT XXIII/8. Isosicyonis striata n. sp. is easily distinguishable externally from the other species of the genus Isosicyonis alba by its pattern: white longitudinal stripes on the column, oral disc, and tentacles. It is also distinguished by internal features including the retractor muscles, parietobasilar muscles, marginal sphincter muscles, number of mesenteries, and cnidae. The genus Isosycionis is currently only known from the Southern Ocean. Both species of Isosicyonis live in association with a gastropod, with a single sea anemone occupying almost the whole shell of its gastropod host. The description of this new species, and our re-examination of Isosicyonis alba, resolves the controversial higher taxonomic position of the genus, confirming its placement within the Endomyaria.

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References

Andres, A. – 1883. Le Attinie. Bibliografia, introduzione e specigrafia. Coi Tipi der Salviucci, Roma.

Carlgren, O. – 1927. Actiniaria and Zoantharia. In: T. Odhner (ed.), Further Zool. Res. Swed. Ant. Exp. 1901-1903, 2(3): 1-102.

Carlgren, O. – 1940. A contribution to the knowledge of the structure and distribution of the cnidae in Anthozoa. K. Fysiogr. Sällsk. Handl., ser. NF, 51(3): 1-62.

Carlgren, O. – 1949. A survey of the Ptychodactiaria, Corallimorpharia and Actiniaria. K. Svenska Vetenskaps-Akad. Handl., ser. 4, 1(1): 1-121.

Cutress, C.E. – 1955. An interpretation of the structure and distribution of cnidae in Anthozoa. Syst. Zool., 3(4): 120-137. doi:10.2307/2411864

Daly, M. and L. Gusmão. – 2007. The first sea anemone (Cnidaria, Anthozoa) from a whale fall. J. Nat. Hist., 41: 1-11. doi:10.1080/00222930601121775

Daly, M., D.G. Fautin and V.A. Cappola. – 2003. Systematics of the Hexacorallia (Cnidaria: Anthozoa). Zool. J. Linn. Soc., 139: 419-437. doi:10.1046/j.1096-3642.2003.00084.x

Daly, M., A. Ardelean, H. Cha, A.C. Campbell and D.G. Fautin. – 2004. A new species, Adamsia obvolva (Cnidaria: Anthozoa: Actiniaria), from the Gulf of Mexico, and a discussion of the taxonomy of carcinoecium-forming sea anemones. Bull. Mar. Sci., 74: 385-399.

Edmands, S. and D.G. Fautin. – 1991. Redescription of Aulactinia veratra n. comb. (=Cnidopus veratra) (Coelenterata: Actiniaria) from Australia. Rec. W. Austrl. Mus., 15(1): 59-68.

Fautin, D.G. – 1984. More Antarctic and Subantarctic sea anemones (Coelenterata: Corallimorpharia and Actiniaria). Ant. Res. Ser., 41: 1-42.

Fautin, D.G. – 1988. Importance of nematocysts to Actinian taxonomy. In: D.A. Hessinger and H.M. Lenhoff (eds.), The Biology of Nematocysts, 25, pp. 487-500. Academic Press, San Diego.

Fautin, D.G. and R.R. Hessler. – 1989. Marianactis bythios, a new genus and species of actinostolid sea anemone (Coelenterata: Actiniaria) from the Mariana vents. Proc. Biol. Soc. Wash., 102(4): 815-825.

Gabe, M. – 1968. Technique Histologique. Massou et Cie, Paris.

Häussermann, V. – 2004. Redescription of Phymactis papillosa (Lesson, 1830) and Phymanthea pluvia (Drayton in Dana, 1846) (Cnidaria: Anthozoa), two common actiniid sea anemones from the southeast Pacific with a discussion of related genera. Zool. Med. Leiden., 78(23): 345-381.

Johansen, D.A. – 1940. Plant microtechniques. McGraw-Hill, New York and London.

López-González P.J., E. Rodríguez, J.M. Gili and M. Segonzac. – 2003. New records on sea anemones (Anthozoa: Actiniaria) from hydrothermal vents and cold seeps. Zool. Verh., 345: 215-243.

López-González P.J., E. Rodríguez and M. Segonzac. – 2005. A new species of sea anemone (Cnidaria: Anthozoa: Actiniaria) from Manus Basin Hydrothermal Vents, South-Western Pacific. Mar. Biol. Res., 1: 326-337. doi:10.1080/17451000500380306

Mariscal, R.N. – 1974. Nematocysts. In: L. Muscatine and H.M. Lenhoff (eds.), Coelenterate Biology, pp. 129-178. Academic Press, New York.

Östman, C. – 2000. A guideline to nematocyst nomenclature and classification, and some note on the systematic value of nematocysts. Sci. Mar., 64(Supl. 1): 31-46.

Ridley, S.O. – 1882. Zoological collections made during the survey of H.M.S. “Alet” X. Coelenterata. Proc. Zool. Soc. Lond., 1881: 101-107.

Riemann-Zürneck, K. – 1980. Actiniaria des Südwestatlantik. V. Bolocera, Isotealia, Isosicyonis (Actiniidae). Mitt. Hamb. Zool. Mus. Inst., 77: 19-33.

Riemann-Zürneck, K. – 1986. Zur Biogeographie des Südwestatlantik mit besonderer Berücksichtigung der Seeanemonen (Coelenterata: Actiniaria). Helgol. Meeresunters., 40: 91-149. doi:10.1007/BF01987291

Sanamyan, N.P. and K.E. Sanamyan. – 2007. Deep-water Actiniaria from East Pacific hydrothermal vents and cold seeps. Invert. Zool., 4(1): 83-102.

Shick, J.M. – 1991. A functional Biology of Sea Anemones. In: P. Calow (ed.), Functional Biology Series, pp. 395. Chapman and Hall, London, New York, Tokyo, Melbourne, Madras.

Studer, T. – 1879. Zweite Abtheilung der Anthozoa polyactinia, welche während der Reise S.M.S. Corvette Gazelle um die Erde gesammelt wurden. Monat. Akad. Wiss. Berlin., 25: 524-550.

Westfall, J. – The differentiation of nematocysts and associated structures in the Cnidaria. Z. Zellforsch. Mikrosk. Anat., 75: 381-403. doi:10.1007/BF00336871

Zamponi, M.O., M.J.C. Belém, E. Schlenz and F.H. Acuña. – 1998. Distribution and some ecological aspects of Corallimorpharia and Actiniaria from shallow waters of the South American Atlantic coasts. Physis, 55: 31-45.