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Rissoa

{{Short description|Genus of gastropods}}

{{For|the defunct plant genus Rissoa|Atalantia}}

{{Automatic taxobox

|image = Rissoa janusi 001.jpg

|image_caption = Shell of Rissoa janusi

|taxon = Rissoa

|authority = Freminville in Desmarest, 1814

|synonyms_ref =

|synonyms =

  • Apicularia Monterosato, 1884
  • Elatiella Nordsieck, 1972
  • Goniostoma Villa, 1841
  • Gueriniana Nordsieck, 1972
  • Lamarckia Leach, 1852
  • Liavenustia Nordsieck, 1972
  • Lilacinia Nordsieck, 1972
  • Loxostoma Bivona-Bernardi, 1838
  • Persephona Leach, 1852
  • Rissoia Bronn, 1848
  • Rissostomia G.O. Sars, 1878
  • Sabanea Monterosato, 1884
  • Schwartzia Bucquoy, Dautzenberg & Dollfus, 1884
  • Sfaxiella Nordsieck, 1972
  • Turboella Leach, 1847
  • Zippora Leach, 1852

|type_species = Rissoa ventricosa

|type_species_authority = Desmarest, 1814

|subdivision_ranks = Species

|subdivision = See text

}}

Rissoa is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae.{{WRMS species|138456|Rissoa Freminville in Desmarest, 1814|||Gofas, S. (2010). Rissoa Freminville in Desmarest, 1814. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138456 on 16 June 2011}}

The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist of Nice, France. They were described by M. Demarest in 1814 in the "New Bulletin of the Philomatic Society".

Description

The soft body of the snail is elongated and spiral. The somewhat prolonged mouth has a proboscis. The tentacles are awl-shaped with the eyes on a small prominence near the base. The foot is oval or elliptical. The species is phytophagous.

The conical shell has an elongated spire with its apex nipple-shaped. The size of the shell varies between 1 mm and 8 mm. The whorls are generally convex-shaped with a distinct suture. The aperture is ovate, roundish or pear-shaped with its anterior end rounded, the posterior end acute and with the peristome complete. The thin and horny operculum is spirally marked and equally ovate, roundish or pear-shaped.[https://archive.org/stream/histmolluscous00macgrich#page/146/mode/2up Macgillivray, William, History of the molluscous animals of Scotland, London, 1844]

Habitat

This species can be found on brown algae (genus Fucus), in clefts of rocks, on stones, on mud or sand. Most will be found on sandy beaches along the line of the last tide.

Species

Species within the genus Rissoa include:

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{{div col end}}

Synonyms

References

{{Reflist}}

  • Nordsieck, F. (1972). Die europäischen Meeresschnecken (Opisthobranchia mit Pyramidellidae; Rissoacea). Vom Eismeer bis Kapverden, Mittelmeer und Schwarzes Meer. Gustav Fischer, Stuttgart. XIII + 327 pp.
  • Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). {{ISBN|0-915826-22-4}}. XII, 195 pp.
  • Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180–213

External links

  • [https://biodiversitylibrary.org/page/4121250 Desmarest A. G. (1814). Description des coquilles univalves du genre Rissoa de M. De Fréminville. Bulletin des Sciences, par la Société Philomatique de Paris. 1814: 7-9, pl. 1.]
  • [https://www.biodiversitylibrary.org/page/1310707 Leach W. E. (1852). Molluscorum Britanniae Synopsis. A synopsis of the Mollusca of Great Britain arranged according to their natural affinities and anatomical structure. London pp. VIII + 376]
  • [https://www.biodiversitylibrary.org/item/109711 Monterosato, T. A. di. (1884). Nomenclatura generica e specifica di alcune conchiglie mediterranee. Virzi, printed for the author, Palermo, 152 pp]
  • [https://www.biodiversitylibrary.org/item/103592 Bucquoy E., Dautzenberg P. & Dollfus G. (1882-1886). Les mollusques marins du Roussillon. Tome Ier. Gastropodes. Paris: Baillière & fils. 570 pp., 66 pls.]
  • [http://australianmuseum.net.au/journal/Ponder-1985-Rec-Aust-Mus-Suppl-4-1221/ Ponder W. F. (1985). A review of the Genera of the Rissoidae (Mollusca: Mesogastropoda: Rissoacea). Records of the Australian Museum supplement 4: 1-221]

{{Commons category|Rissoa}}

{{Taxonbar|from=Q3169901}}

Category:Gastropod genera