Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-24T03:13:44.213Z Has data issue: false hasContentIssue false
  • English
  • Français

The Structure and Life History of Some Minute Prosobranchs of Rock Pools: Skeneopsis Planorbis (Fabricius), Omalogyra Atomus (Philippi), Rissoella Diaphana (Alder) and Rissoella Opalina (Jeffreys)

Published online by Cambridge University Press:  11 May 2009

Vera Fretter
Vera Fretter
Affiliation:
From the Department of Zoology, Birkbeck College, University of London
Get access Rights & Permissions [Opens in a new window]

Extract

The external features of Skeneopsis planorbis (Fabricius) are described and compared with those of Omalogyra atomus (Philippi), Rissoella diaphana (Alder) and R. opalina (Jeffreys).

The foot has a large posterior mucous gland (Figs. 1 and 4, Pm; PI. IV, figs. 1 and 2, Al, Pl), its secretion forming a thread on which the mollusc can climb from one level to another.

Correlated with their small size are modifications of the pallial organs. Skeneopsis, the largest and least specialized, has a bipectinate osphradium, but the gill is reduced to nine filaments; the anus lies well within the mantle cavity. In the other genera osphradium and ctenidium are lost, though the latter may be represented in Rissoella by a small tract of ciliated epithelium. In the absence of a ctenidium the animals depend entirely upon pallial respiration and the stream of water through the mantle cavity is maintained by other means: from the anus strips of ciliated epithelium pass forward to the mouth of the mantle cavity, causing a strong exhalant stream and carrying away the faecal pellets. There is a compensating inhalant flow. The kidney (PI. IV, figs. 1 and 2, K), with its rich vascular supply, has migrated into the tissues of the mantle, increasing its respiratory efficiency.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 27 , Issue 3 , November 1948 , pp. 597 - 632
Copyright
Copyright © Marine Biological Association of the United Kingdom 1948

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Ankel, W. E., 1936. Prosobranchia in: Grimpe, G. and Wagler, E., Die Tieruelt der Nord- und Ostsee, Teil IX b. Leipzig.Google Scholar
Ankel, W. E., 1938. Erwerb und Aufnahme der Nahrung bei den Gastropoden. Verh. dtsch. Zool. Ges., Zool. Anz., Suppl. XI, pp. 223–95.Google Scholar
Forbes, E. & Hanley, S., 1853. British Mollusca. London.Google Scholar
Fretter, V., 1939. The structure and function of the alimentary canal of some tectibranch molluscs, with a note on excretion. Trans. Roy. Soc. Edin., Vol. LIX, pp. 599–646.CrossRefGoogle Scholar
Fretter, V., 1941. The genital ducts of some British stenoglossan prosobranchs. Journ. Mar. Biol. Assoc., Vol. XXV, pp. 173–211.CrossRefGoogle Scholar
Graham, A., 1932. On the structure and function of the alimentary canal of the limpet. Trans. Roy. Soc. Edin., Vol. LVII, pp. 287–308.CrossRefGoogle Scholar
Graham, A., 1939. On the structure of the alimentary canal of style-bearing prosobranchs. Proc. Zool. Soc. London, B, Vol. CIX, pp. 75–112.CrossRefGoogle Scholar
Jeffreys, J. G., 1867. British Conchology, Vol. IV. London.Google Scholar
Johansson, J., 1939. Anatomische Studien über die Gastropoden-familien Rissoidae und Littorinidae. Zool. Bidrag Uppsala, Bd. XVIII, pp. 285–396.Google Scholar
Lebour, M. V., 1934. Rissoid larvae as food of the young herring. The eggs and larvae of the Plymouth Rissoidae. Journ. Mar. Biol. Assoc., Vol. XIX, pp. 523–39.CrossRefGoogle Scholar
Lebour, M. V., 1936: Notes on the eggs and larvae of some British prosobranchs. Journ. Mar. Biol. Assoc., Vol. XX, pp. 547–65.CrossRefGoogle Scholar
Lebour, M. V., 1937. The eggs and larvae of the British prosobranchs with special reference to those living in the plankton. Journ. Mar. Biol. Assoc., Vol. XXII, pp. 105–66.CrossRefGoogle Scholar
Linke, O., 1933. Der Laich von Skeneopsis planorbis O. Fabricius (Gastropod. Prosobranch.). Zool. Anz., Bd. CIII, pp. 207–11.Google Scholar
Pruvot-Fol, A., 1926. Le bulbe buccal et la symétrie des mollusques. I. La Radula. Arch. Zool. Exp. Gén., T. LXV, pp. 209–344.Google Scholar
Thiele, J., 1929. Handbuch der systematischen Weichtierkunde. Jena.Google Scholar