Knoutsodonta pusilla

Knoutsodonta pusilla (Alder & Hancock, 1845)

Knoutsodonta pusilla by Bernard Picton

Taxonomy
 

Superdomain

Biota  

 

Kingdom

Animalia  

 

Phylum

Mollusca  

 

Class

Gastropoda  

 

Subclass

Heterobranchia  

 

Infraclass

Euthyneura  

 

Subterclass

Ringipleura  

 

Superorder

Nudipleura  

 

Order

Nudibranchia  

 

Suborder

Doridina  

 

Infraorder

Doridoidei  

 

Superfamily

Onchidoridoidea  

 

Family

Onchidorididae  

 

Genus

Knoutsodonta  

 

Species

Knoutsodonta pusilla  (Alder & Hancock, 1845)

 
 Classification according to Bouchet et al. (2017)
Taxonomic source: World Register of Marine Species (AphiaID: 1259492).
Synonyms

  • Doris pusilla Alder & Hancock, 1845
  • Onchidoris pusilla (Alder & Hancock, 1845)

Description
This species of doridacean can reach a size of 9-10 mm in length. The body is oval shaped and very flattened, nearly circular when the animal is at rest. The body color is dark brown because of numerous densely packed colour patches covering it. Near the edge of the mantle there are usually whitish stains. All the dorsal mantle is covered with small conical brown tubercles, although frequently their base is whitish; tubercles located near the margin of the mantle are smaller. As in other species of Knoutsodonta, the mantle is very espiculous with elongated transversally laid spicules in the center, and diagonally laid near the edges, but this spiculation is not apparent due to the pigmentation of the body. The rhinophores are white, short, with up to nine lamellae and do not have a high rhinophoric sheath; the rhinophoric orifice has two tubercles in an anterior-internal position and in lateral-external position. The gill consists of up to nine small simply pinnate leaves arranged in a circle on the back of the dorsum, almost completely surrounding the anus; The gill crown is also tuberculate, with two tubers in anterior position and another one closing the gill circle. The gill leaves colour is white, like rhinophores, but Mediterranean specimens are pigmented dark brown with scores, like the mantle, although the spine is coloured cream. The cephalic region under the mantle does not differentiate oral palps; the cephalic veil border is usually pigmented brown. The foot is whitish with tiny brown spots; internal viscera can be glimpsed through the center of the foot as a reddish-brown stain.

Biology
The specimens of this species tend to live both in the intertidal and subtidal stratum, often under stones and on the bryozoan colonies from which they feed. There have been cited, as food or substrate,  the following species of bryozoans: Callopora spp., Escharella immersa, Microporella ciliata, Escharoides coccineus, Porella concinna and Schizomavella linearis (McDonald & Nybakken, 1999). The spawn consists of a semitransparent narrow cord with white eggs, wound in a tight flat spiral with up to 9 turns; sometimes there are two egg spirals surrounded by a unique exterior cord. The spawns have been observed in the month of May.

Etymology

  • Knoutsodonta, from the Greek meaning “lame tooth”, to represent nudibranch species that lack a rachidian or middle tooth.
  • Pusilla, from Latin “pusillus”, petty, trifling, insignificant, very small.

Distribution
There are few known references of this species. It has been observed in the Norwegian coast, in the British Isles, and in the Atlantic Iberian Peninsula shores. In the Iberian Coast it has been cited in the Cantabrian Sea and the Strait of Gibraltar.

Known georeferenced records of the species: Knoutsodonta pusilla
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: Knoutsodonta pusilla

    Galicia: Ortea (1979b), Urgorri and Besteiro (1983, 1984). Gibraltar: Sánchez Santos (pers. comm.).

    General: Brown & Picton, 1979:13; Picton & Morrow, 1994:66[P]; Thompson, 1988:190; Thompson & Brown, 1976:104; 1984:60[P]

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

Abundance

    Western Mediterranean:0 out of 5 stars
    Eastern Mediterranean:0 out of 5 stars
    Atlantic Ocean:1 out of 5 stars
Month

This chart displays the monthly observation probability for Knoutsodonta pusilla based on our own records.

More pictures

Bibliography

    Abbott, R. T. 1974. American seashells. The marine mollusca of the Atlantic and Pacific coast of North America. Van Nostrand, New York. 663 pp., 24 pls. [October 1974].
    Abraham, P. S. 1877. Revision of the anthobranchiate nudibranchiate Mollusca with descriptions or notices of forty-one hitherto undescribed species. Proceedings of the Zoological Society of London 1877: 196-269 [agosto].
    Adams, A. A., and H. Adams. 1853. The genera of recent Mollusca, arranged according to their organization. London (van Voorst): pp.1-256, pls 1-32, 1853; 257-484, pls 33-60, 1854 (1); 1-92, pls 61-72, 1854; 93-284, pls 73-96, 1855; 285-412, pls 97-112, 1856; 413-540, pls 113-128, 1857; 541-661, pls 129-138, 1858 (2). vol 2; pp 45-78 Oct.-Nov. 1854; pp 97-99 Jan 1855; p 632-635 Nov 1858; pls. 62-68, 137, fig. 14; pl 138, fig. 1.
    Alder, J. 1869. Account of the British Nudibranchiata. Jeffrey’s British Conchology 5:18-94.
    Alder, J., and A. Hancock. 1855. A monograph of the British nudibranchiate Mollusca: with figures of all the species. Ray Society, London.
    Alder, J., and A. Hancock. 1845. A monograph of the British nudibranchiate Mollusca: with figures of all the species. Ray Society, London.
    Alder, J., and A. Hancock. 1846. Notices of some new and rare British species of naked Mollusca. Annals and Magazine of Natural History 18: 289-294, pl. 4 [novembre].
    Alder, J., and A. Hancock. 1851. A monograph of the British nudibranchiate Mollusca: with figures of all the species. Ray Society, London.
    Ansted, D. T. 1862. The Channel Islands, xxviii + 604 pp. Wm H Allen Co.
    Ballesteros, M. 1982. Estado actual de la fauna de Doridaceos (Mollusca: Opisthobranchia) de las costas Catalanas. Oceanografia de la Mediterrania Occidental, Res. Com Oral Reunion Soc. Cat. Biologia, 2 pp.
    Ballesteros, M. 1980. Contribución al conocimientos de los Sacoglosos y Nudibranquios (Mollusca: Opisthobranchia). Estudio anatómico, sistemático y faunístico de las especies del mediterráneo español. Tesis Doctoral. Universitat de Barcelona.
    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. 2020. OPK - Opistobranquis. (https://opistobranquis.info/).
    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.
    Bergh, L. S. R. 1908. Malacologische Untersuchungen, In: Reisen im Archipel der Philippinen von Dr Carl Gottfried Semper. Zweiter Theil. Wissenschaftliche Resultate. Band 9, Theil 6, Heft 3; pp 119-181, pls. 9-12.
    Bergh, L. S. R. 1879. Gattungen nordische Doriden. Archiv fur Naturgeschichte 45(1):340-369, pl 19.
    Bergh, L. S. R. 1883. Beitrage zu einer Monographie der Polyceraden. III. Verhandlungen der koniglich-kaiserlich Zoologisch-botanischen Gesellschaft in Wien (Abhandlungen) 33:135- 180, pls. 6-10.
    Bergh, L. S. R. 1880. On the Nudibranchiate Gasteropod Mollusca of the North Pacific Ocean, with special reference to those of Alaska. Second Part. S. Scientific results of the exploration of Alaska by the parties under the charge of W.H. Dall, during the years 1865-1874, Washington, D.C.
    Bergh, R. 1892. System der Nudibranchiaten Gasteropoden. Malacologische Untersuchungen. In: Reisen im Archipel der Philippinen von Dr. Carl Gottfried Semper. Zweiter Theil#Wissenschaftliche Resultate. Band 7, Theil 5. [pp. 1–51, pls 1–4, Mar. 1897; pp. 53–115, pls 5–8, Dec. 1897; pp. 117–158, pls 9–12, Nov. 1898; pp. 159–208, pls 13–16, 27 Mar. 1900; pp. 209–256, pls 17–20, 29 Jan. 1901; pp. 257–312, pls. 21–24, 15 Oct. 1901; pp. 313–382, pls 25–29, 7 Oct. 1902].
    Bergh, L. S. R. 1878. Malacologische Untersuchungen, In: Reisen im Archipel der Philippinen von Dr Carl Gottfried Semper. Zweiter Theil. Wissenschaftliche Resultate. Band 2, Theil 2, Heft 14; pp 603-645, I-L, pls. 66-68.
    Brown, G. H., and B. E. Picton. 1979. Nudibranchs of the British Isles — a colour guide. Underwater Conservation Society, Manchester, by R. Earll.
    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.
    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.
    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.
    Cornet, R., and M. Marchad. 1951. Inventaire de la faune marine de Roscoff Mollusques. Travaux de la Station Biologique de Roscoff, Suppl 5:1-80.
    de Montaudouin, X., and P.-G. Sauriau. 2000. Contribution to a synopsis of marine species  richness in the Perthuis Charentais Sea with new insights in soft-bottom macrofauna of the Marennes- Oléron Bay. Cahiers de Biologie Marine 41(2):181-222.
    Debelius, H., and R. H. Kuiter. 2007. Nudibranchs of the world. IKAN- Unterwasserarchiv, Frankfurt.
    Edmunds, M. 1968. Acid secretion in some species of Doridacea (Mollusca, Nudibranchia). Proceedings of the Malacological Society of London 38:121-133; tbls. 1-3; figs. 1-4.
    Eliot, C. N. E. 1910. A monograph of the British nudibranchiate Mollusca: with figures of the species; Figures by the late Joshua Alder and the late Albany Hancock, and others. Ray Society, London.
    Evertsen, J., and T. Bakken. 2005. Nudibranch diversity (Heterobranchia, Gastropoda) along the coast of Norway. Fauna Norvegica, 25: 1-37.
    Evertsen, J., and T. Bakken. 2013. Diversity of Norwegian sea slugs (Nudibranchia): new species to Norwegian coastal waters and new data on distribution of rare species. Fauna Norvegica 32: 45-52.
    Furfaro, G., and E. Trainito. 2017. A new species from the Mediterranean Sea and North-Eastern Atlantic Ocean: Knoutsodonta pictoni n. sp. (Gastropoda, Heterobranchia, Nudibranchia). Biodiversity Journal, 2017, 8 (2): 725–738.
    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.
    Gosse, P. H. 1856. A manual of marine zoology for the British Isles, vol 2, 239 pp. London.
    Hoffmann, H. 1926. I. Opisthobranchia, In: Die Tierwelt der Nord- und Ostsee, Lieferung III, Teil IX; pp 1- 52. Akademische Verlagsgesellschaft, Leipzig.
    Høisæter, T. 1986. An annotated check-list of marine molluscs of the Norwegian coast and adjacent waters. Sarsia 71(2):73-175.
    Jeffreys, J. G. 1862. British Conchology. London, van Voorst : Vol. 1: pp. CXIV + 341 [1862]. Vol. 2: pp. 479 [1864] Il frontrespizio reca la data 1863 ma in effetti pubblicato nel 1864. Vol. 3: pp. 394 [1865]. Vol. 4: pp. 487 [1867]. Vol. 5: pp. 259 [1869]. J. Van Voorst.
    Just, H., and M. Edmuns. 1985. North atlantic nudibranchs (Mollusca) seen by Henning Lemche. Ophelia supplement 2: 1-150.
    Knight, C. 1867. Natural history or second division of “The English cyclopædia,”, vol. 4, 1292 pp. Bradbury, Evans, & Co., London.
    Long, S. J. 2006. Bibliography of Opisthobranchia 1554-2000. Bayside Books & Press, Tustin, CA, U.S.A. 672p.
    Marcus, E. G. 1958. On western Atlantic opisthobranchiate gastropods. American Museum Novitates (1906):1-82.
    McAndrew, R. 1861. List of the British marine invertebrate fauna. Report of the 30th Meeting of the  British Association for the Advancement of Science; Held at Oxford in June & July 1860, pp. 217-236.
    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).
    McKay, D. W., and S. M. Smith. 1979. Marine Mollusca of east Scotland. Royal  Scottish Museum.
    Menéndez, J. L., and J. Oliveros. 2004. Onchidoris pusilla accessed through: AsturNatura on 2015-02-05. (http://www.asturnatura.com/especie/onchidoris-pusilla.html).
    Nordsieck, F. 1972. Die europäischen Meeresschnecken : (Opisthobranchia mit Pyramidellidae, Rissoacea) : vom Eismeer bis Kapverdem, Mittelmeer und Schawarzes Meer. Gustav Fischer, Stuttgart.
    Nunn, J. D. 2006. The marine Mollusca of Ireland 3. Lough Hyne, Co. Cork. Bulletin of the Irish  Biogeographical Society (30):114-292.
    Ortea, J. A. 1979. Nuevas especies de Nudibranquios del Norte de Espana. Fundacion Juan March, Serie Universitaria 86. Flora Y Fauna Acuaticas, p 25-31, 1 pl.
    Ortea, J. 1979. Dos nuevas especies ibéricas de Onchidoris (Mollusca Opisthobranchia, Doridacea) colectadas en Asturias. Boletín de Ciencias de la Naturaleza (IDEA) 24: 167-175.
    Ortea, J., and M. Ballesteros. 1982. Sobre algunos Onchidoris Blainville, 1816 (Mollusca, Opisthobranchia, Doridacea) del litoral ibérico. Investigación Pesquera 46 (2): 239-254.

    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 (2012-2020) "Knoutsodonta pusilla" in OPK-Opistobranquis, Published: 17/05/2012, Accessed: 24/02/2020 at (https://opistobranquis.info/en/JuGvP)

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