Thordisa filix

Thordisa filix Pruvot-Fol, 1951

Thordisa filix by Manuel Ballesteros

Taxonomy
 

Superdomain

Biota  

 

Kingdom

Animalia  

 

Phylum

Mollusca  

 

Class

Gastropoda  

 

Subclass

Heterobranchia  

 

Infraclass

Euthyneura  

 

Subterclass

Ringipleura  

 

Superorder

Nudipleura  

 

Order

Nudibranchia  

 

Suborder

Doridina  

 

Infraorder

Doridoidei  

 

Superfamily

Doridoidea  

 

Family

Discodorididae  

 

Genus

Thordisa  

 

Species

Thordisa filix  Pruvot-Fol, 1951

 
 Classification according to Bouchet et al. (2017)
Taxonomic source: World Register of Marine Species (AphiaID: 139591).
Description
This species can reach 40 mm in length, but usually the cited specimens measure between 15 and 25 m in length. The color of the animal is a more or less homogeneous yellow with 1-2 dark areas in the mantle due to internal viscera, however, some specimens are coloured in lighter shades. The dorsum has numerous conical or slightly digitiform (finger like) tubercles and other filiform (thread like) tubercles sparser and coloured brown at the tip, forming a line of 5-6 tubercles in the center of the dorsum. The dorsum is very spiculous, as are the tubercles, which have spicules on their base in a starry arrangement. The rhinophores are yellow but have a thin brown pigmentation in the lamellae, the apex is whitish; the rhinophoric sheath is rather high and its upper edge is tuberculate. The gill consists of four tripinnate gill leaves that remain high and growing from a single basal protuberance; they are thin and semitransparent but with a light brown raquis. Branchial sheath is slightly raised and its upper edge is also tuberculate. In the center of the gill leaves lies the anal papilla, which is quite high, brownish and with 6-8 lobulations with rounded tips. The foot is relatively narrow, coloured uniform yellow and is furrowed and cleft on the front side. The mouth is located in a highly developed oral protuberance and has two whitish elongated labial palps. The genital orifice is very apparent and it is positioned on the underside of the mantle, to the right of the body.

Biology
This is a species living at a certain depth on the continental shelf, so it is difficult to observe by scuba diving. Very few details of its biology are known. Most of the known specimens have been collected by commercial trawling on soft or maerl bottoms at depths of 40-150 m. Schmekel cites that the spawn is an spiral ribbon with yellow eggs of about 120 microns. It’s supposed to feed on sponges, like other species of the same genus.

Etymology

  • Thordisa. Woman name of Old Norse origin, cited in the Sagas. A fair woman to look on, high-minded, and rather hard of heart.
  • Filix. Latin word meaning fern, bracken, probably related to the shape of the gills.

Distribution
T. filix has been cited so far in the western Mediterranean (Banyuls, Gulf of Naples, Spanish Levantine coast, Catalonia, Mallorca) and in Turkey, and there is also one citation of the species in the coasts of Portugal, which would be the only one out of the Mediterranean Sea. In the Catalan coast it is a relatively common species in commercial fishing grounds like La Planassa, off Blanes (Costa Brava), between 100 and 150 meters deep, a bottom rich in sponges, cnidarians, crustaceans, molluscs and fish.

Known georeferenced records of the species: Thordisa filix
Sources:
: OBIS
: GROC 2010-2011
: Enric Madrenas
: João Pedro Silva
: Bernard Picton
: GBIF.ORG
: OPK
: VIMAR
: Manuel Ballesteros.
: M@re Nostrum
: Altres fonts
: Marine Regions

References for the species: Thordisa filix

    Portugal: García-Gómez et al. (1991), Calado et al. (1999). Levante: Templado, Luque and Moreno (1988). Catalunya: Cervera et al. (1988), Domènech et al. (2006).

    General: Cattaneo-Vietti, Chemello, & Giannuzzi-Savelli, 1990:93[P]; Nordsieck, 1972:62; Pruvot-Fol, 1954b:252; Schmekel, 1970:198; Schmekel & Portmann, 1982:93[P]; Vicente, 1967:151

    Sources: Cervera et al., 2004, Ballesteros, 2007 & 2016, McDonald, 2006 and other sources.

Abundance

    Western Mediterranean:1 out of 5 stars
    Eastern Mediterranean:1 out of 5 stars
    Atlantic Ocean:1 out of 5 stars
Month

This chart displays the monthly observation probability for Thordisa filix based on our own records.

More pictures

    We have no (more) pictures for Thordisa filix

Bibliography

    Ballesteros, M. 2007. Lista actualizada de los opistobranquios (Mollusca: Gastropoda: Opisthobranchia) de las costas catalanas. Spira. 2: 163–188.
    Ballesteros, M., E. Madrenas, and M. Pontes. 2019. OPK - Opistobranquis. (https://opistobranquis.info/).
    Ballesteros, M., E. Madrenas, and M. Pontes. 2016. Actualización del catálogo de los moluscos opistobranquios (Gastropoda: Heterobranchia) de las costas catalanas. Spira 6(2016): 1-28.
    Barash, A., and Z. Danin. 1992. Annotated list of Mediterranean molluscs of Israel and Sinai, viii, Fauna Palaestina, Mollusca I. ed. Israel Academy of Sciences &  Humanities.
    Bedulli, D., R. Cattaneo-Vietti, R. Chemello, F. Ghisotti, and F. Giovine. 1995. Gastropoda Opisthobranchia, Divasibranchia, Gymnomorpha, Fascicolo 15, pp. 1-23.  In: A. Minelli, A. Ruffo, & S. La Posta (Eds.). Checklist delle specie fauna italiana, Checklist delle specie della Fauna Italiana. Calderini, Bologna.
    Calado, G., V. Urgorri, R. Gaspar, and F. J. Cristobo. 1999. Catálogo de los moluscos opistobranquios bentónicos de las costas de Setúbal-Espichel (Portugal). Nova Acta Científica Compostelana (Bioloxía) 9: 285-294.
    Cattaneo-Vietti, R. 1986. Alcune considerazioni sui molluschi opistobranchi del Mar Ligure. Lavori Societa Italiana di Malacologia 22:85-96.
    Cattaneo-Vietti, R., and G. Barletta. 1984. Elenco preliminare dei molluschi opistobranchi viventi nel Mediterraneo (Sacoglossa, Pleurobranchomorpha, Acochlidiacea, Aplysiomorpha, Nudibranchia). Bollettino Malacologico (Pubblicazione Mensile Edita dalla Societa Italiana di Malacologia) 20(9-12):195-218.
    Cattaneo-Vietti, R., and T. E. Thompson. 1989. Mediterranean opisthobranch molluscs: a zoogeographic approach. Bollettino Malacologico (Pubblicazione Mensile Edita dalla Societa Italiana di Malacologia) 25(5-8):183-204.
    Cattaneo-Vietti, R., R. Chemello, and R. Giannuzzi-Savelli. 1990. Atlante dei nudibranchi del Mediterraneo. La Conchiglia, Rome 264 pp, 14 pls. (104 clr. ill), line drawings.
    Cervera, J. L., and J. C. García-Gómez. 1989. A new species of the genus Thordisa (Molusca: Nudibranchia) from the southwestern Iberian Peninsula. The Veliger 32 (4): 382-389.
    Cervera, J. L., G. Calado, C. Gavaia, M. A. E. Malaquías, J. Templado, M. Ballesteros, J. C. García-Gómez, and C. Megina. 2004. An annotated and updated checklist of the opisthobranchs (Mollusca: Gastropoda) from Spain and Portugal (including islands and archipelagos). Boletín Instituto Español de Oceanografía, 20 (1-4): 1-111. L.
    Cervera, J. L., J. Templado, J. C. García-Gómez, M. Ballesteros, J. Ortea, F. J. García, J. Ros, and A. A. Luque. 1988. Catálogo actualizado y comentado de los Opistobranquios (Mollusca, Gastropoda) de la Península Ibérica, Baleares y Canarias, con algunas referencias a Ceuta y la isla de Alborán. Iberus, supl. 1: 1-84.
    Dayrat, B. 2005. Advantages of naming species under the PhyloCode: an example of how a new species of Discodorididae (Mollusca, Gastropoda, Euthyneura, Nudibranchia, Doridina) may be named. Marine Biology Research 1: 216-232.
    Dayrat, B., and T. M. Gosliner. 2005. Species names and metaphyly: a case study in Discodorididae (Mollusca, Gastropoda, Nudibranchia, Doridina). Zoologica Scripta 34 (2).
    Domènech, A., C. Ávila, and M. Ballesteros. 2006. Opisthobranch molluscs from the subtidal trawling grounds off Blanes (Girona, north-east Spain). J. Mar. Biol. Ass. U.K., 86: 383-389.
    Edmunds, M. 1991. Does warning coloration occur in nudibranchs. Malacologia 32(2):241-255.
    Flanders Marine Institute. 2018. Maritime Boundaries Geodatabase: Territorial Seas. Maritime Boundaries Geodatabase. (http://www.marineregions.org/).
    Garcia, F. J., and H. Bertsch. 2009. Diversity and distribution of the Gastropoda Opisthobranchia from the Atlantic Ocean: A global biogeographic approach. Scientia Marina. 73: 153–160.
    García-Gómez, J. C. 2002. Paradigmas de una fauna insólita; Los moluscos opistobranquios del estrecho de Gibraltar (Serie Ciencias) 20: 397 pp. Instituto de Estudios Gibraltareños. Algeciras, Cádiz, Spain.
    García-Gómez, J. C., J. L. Cervera, F. J. García, J. A. Ortea, S. F. García-Martin, A. Medina, and L. P. Burnay. 1991. Resultados de la campaña internacional de biología marina “Algarve 88”: moluscos opistobranquios. Bollettino Malacologico 27 (5-9): 125-138.
    Long, S. J. 2006. Bibliography of Opisthobranchia 1554-2000. Bayside Books & Press, Tustin, CA, U.S.A. 672p.
    Marcus, E. G. 1955. Opisthobranchia from Brazil. Boletim da Faculdade de Filosofia, Ciencias e Letras, Universidade de Sao Paulo, Zoology, 207, 20:89-261, pls. 1-30.
    McDonald, G. 2009. Bibliographia Nudibranchia. 2nd Online Edition, Annotated. 1072 pp  Institute of Marine Sciences, University of California, Santa Cruz. (http://escholarship.org/uc/item/8115h0wz).
    Nordsieck, F. 1972. Die europäischen Meeresschnecken : (Opisthobranchia mit Pyramidellidae, Rissoacea) : vom Eismeer bis Kapverdem, Mittelmeer und Schawarzes Meer. Gustav Fischer, Stuttgart.
    Ortea, J., and Á. Valdés. 1995. Una nueva especie de Thordisa Bergh, 1877 (Mollusca: Nudibranchia: Discodorididae) de las costas de Angola. Avicennia. 3: 35-41.
    Ozturk, B., A. Dogan, B. Bitlis-Bakir, and A. Salman. 2014. Marine Molluscs of the Turkish Coasts: An Updated Checklist. Tübitak, Turkish Journal of Zoology 38.
    Pruvot-Fol, A. 1953. Etude de quelques Opisthobranches de la côte Atlantique du Maroc et du Senegal. Travaux de l’Institut Scientifique Chérifien 5: 1-105.
    Pruvot-Fol, A. 1951. Etudes des nudibranches de la Méditerranée 2. Archives de Zoologie Expérimentale et Générale 88: 1-80.
    Pruvot-Fol, A. 1954. Mollusques opisthobranches. Faune de France, 58. Paul Lechevalier, Paris.
    Rudman W.B. et al. 1998. Thordisa filix accessed through: Sea Slug Forum on 2014-12-14. (http://seaslugforum.net/showall/thorfili).
    Sabelli, B., R. Gianuzzi-Savelli, and D. Bedulli. 1990. Catalogo annotato dei Molluschi marini del Mediterraneo. Libreria Naturalistica Bolognese. Bologna, Italy: 348 pp.
    Schmekel, L. 1968. Ascoglossa, Notaspidea und Nudibranchia im Litoral des Golfes von Neapel. Revue Suisse de Zoologie 75(6):103- 155; figs. 1-21.
    Schmekel, L., and A. Portmann. 1982. Opisthobranchia des Mittelmeeres, Nudibranchia und Saccoglossa. Fauna e Flora del Golfo Napoli. Springer-Verlag, Berlin.
    Templado, J., and R. Villanueva. 2010. Checklist of Phylum Mollusca. pp. 148-198 In Coll, M., et al., 2010. The biodiversity of the Mediterranean Sea: estimates, patterns, and threats. PLoS ONE 5(8):36pp.
    Templado, J., A. A. Luque, and D. Moreno. 1988. Nuevas aportaciones al conocimiento de los opistobranquios del sureste español. Iberus 8 (1): 15-23.
    Trainito, E., and M. Doneddu. 2014. Nudibranchi del Mediterraneo, 2a. ed. Il Castello.
    Vicente, N. 1967. Contribution l’étude des gastropodes opisthobranches du golfe de Marseille. Recueil des Travaux de la Station Marine d’Endoume 42 (58): 134-179.
    Wirz-Mangold, K., and U. Wyss. 1958. Faune marine des Pyrénées Orientales: Opisthobranches. Vie et Milieu 9 (supplement 2): 1-71.
    WoRMS Editorial Board. 2018. World Register of Marine Species. World Register of Marine Species. (http://www.marinespecies.org).
    Zenetos, A., E. H. K. Akel, C. Apostolidis, M. Bilecenoglu, G. Bitar, V. Buchet, N. Chalari, M. Corsini-Foka, F. Crocetta, A. Dogrammatzi, M. Drakulic, G. Fanelli, G. Giglio, A. Imsiridou, K. Kapiris, P. K. Karachle, S. Kavadas, G. Kondylatos, E. Lefkaditou, L. Lipej, B. Mavric, G. Minos, R. Mousa, E. Prato, M. A. Pancucci-Papadopoulou, W. Renda, N. Ríos, S. I. Rizkalla, F. Russo, M. Servonnat, A. Siapatis, E. Sperone, J. A. Theodorou, F. Tiralongo, and I. Tzovenis. 2015. New Mediterranean Biodiversity Records (April 2015). Mediterranean Marine Science. 03/2015; 16(1):266-284.

    Bibliography based on the works by Steve Long, 2006. Bibliography of Opisthobranchia 1554-2000 and Gary McDonald, 2009. Bibliographia Nudibranchia, with later updates from other resources.

Further reading

Cite this article as:

Ballesteros, Manuel, Enric Madrenas, Miquel Pontes (2012-2019) "Thordisa filix" in OPK-Opistobranquis, Published: 29/08/2012, Accessed: 21/09/2019 at (https://opistobranquis.info/en/E88o4)

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