Overview

Comprehensive Description

Description

 Rissoa parva is a small snail up to 5 mm high and 3 mm wide. There are 7-8 whorls, which have a convex profile. It occurs in two forms, one with smooth whorls (var. interrupta) and one with vertical ridges (costae) on and after the 5th whorl. The shell is cream coloured to pale brown and has a lilac tint around the aperture. The body of the snail is yellow with black streaks and has long slender tentacles with an eye at the base of each.
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Distribution

Absent from Baltic
  • Hayward, P.J.; Ryland, J.S. (Ed.) (1990). The marine fauna of the British Isles and North-West Europe: 1. Introduction and protozoans to arthropods. Clarendon Press: Oxford, UK. ISBN 0-19-857356-1. 627 pp.
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Physical Description

Diagnostic Description

Identification

The status of R. interrupta in relation to R. parva is still a point of discussion. Based on reserche of Wigham (1975), R. interrupta is considered by many authors as a variety of form of R. parva (Fretter & Graham, 1778; McKay & Smith, 1979). Nordsieck (1968) and Verduin (1976) think however that R. interrupta and R. parva are two different species. Both species have a sympatric appearance.
  • Backeljau, T. (1986). Lijst van de recente mariene mollusken van België [List of the recent marine molluscs of Belgium]. Koninklijk Belgisch Instituut voor Natuurwetenschappen: Brussels, Belgium. 106 pp.
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Ecology

Habitat

Depth range based on 44 specimens in 1 taxon.
Water temperature and chemistry ranges based on 9 samples.

Environmental ranges
  Depth range (m): 0 - 76.25
  Temperature range (°C): 7.556 - 11.845
  Nitrate (umol/L): 0.437 - 5.063
  Salinity (PPS): 18.292 - 35.211
  Oxygen (ml/l): 6.138 - 6.964
  Phosphate (umol/l): 0.273 - 0.546
  Silicate (umol/l): 2.315 - 28.168

Graphical representation

Depth range (m): 0 - 76.25

Temperature range (°C): 7.556 - 11.845

Nitrate (umol/L): 0.437 - 5.063

Salinity (PPS): 18.292 - 35.211

Oxygen (ml/l): 6.138 - 6.964

Phosphate (umol/l): 0.273 - 0.546

Silicate (umol/l): 2.315 - 28.168
 
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 On rock from mean tide level to 15 m depth but most common around mean low water springs. Also found on algae, in kelp holdfasts and under rocks.
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Wikipedia

Rissoa parva

Rissoa parva is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.[1]

Taxonomy[edit]

The status of R. interrupta in relation to R. parva is still a point of discussion. Based on reserche of Wigham (1975), R. interrupta is considered by many authors as a variety of form of R. parva (Fretter & Graham, 1778; McKay & Smith, 1979). Nordsieck (1968) and Verduin (1976) think however that R. interrupta and R. parva are two different species. Both species have a sympatric appearance. [1]

Description[edit]

Distribution[edit]

This species occurs in European waters, the Mediterranean Sea and the Black Sea.

References[edit]

  1. ^ a b c Rissoa parva (da Costa, 1778). Gofas, S. (2010). Rissoa parva (da Costa, 1778). 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=141365 on 23 June 2012.
  • Da Costa E. M. (1778). Historia Naturalis Testaceorum Britanniae. London: Millan, White, Elmsley & Robson XII + 254 + VIII p., 17 pl
  • Backeljau, T. (1986). Lijst van de recente mariene mollusken van België [List of the recent marine molluscs of Belgium]. Koninklijk Belgisch Instituut voor Natuurwetenschappen: Brussels, Belgium. 106 pp.
  • Harms, J., 1993. Check list of species (algae, invertebrates and vertebrates) found in the vicinity of the island of Helgoland (North Sea, German Bight) - a review of recent records. Helgoländer Meeresuntersuch. 47 1: 1-34.
  • 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
  • Muller, Y. (2004). Faune et flore du littoral du Nord, du Pas-de-Calais et de la Belgique: inventaire. [Coastal fauna and flora of the Nord, Pas-de-Calais and Belgium: inventory]. Commission Régionale de Biologie Région Nord Pas-de-Calais: France. 307 pp.
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