Overview

Brief Summary

Biology

Type of larval development: short planktonic, non-planktotrophic as usual in Vetigastropoda and Patellogastropoda
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Comprehensive Description

Description

 Emarginula fissura is a typical conical limpet shape with a white shell. The shell is up to 10 mm long and 8 mm high. The foot is shield shaped, broader towards the front. The apex of the shell curves over to the rear of the animal and there is a slit in the front edge that continues to the apex as a groove.
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Distribution

Eastern Atlantic, from Norway to Morocco and the Canary Is.; rare in the Western Mediterranean; from nearshore to ca. 150 m in the northern part of the range, generally deeper than 100 m in the south. Moderately common on Gorringe, Josephine, Ampère and Seine seamounts, 96-335 m
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Physical Description

Diagnostic Description

Diagnosis

Shell up to 15 mm long, with oval contour and elevated, conical profile, apex situated in the posterior third, never overhanging the posterior margin. Sculpture of numerous low radial ribs, alternating stronger and weaker, crossed by comarginal cordlets which are attenuated on the top of the ribs. Slit narrow and deep. Colour white.
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Type Information

Unconfirmed type for Emarginula fissura Linnaeus, 1767
Catalog Number: USNM 178835
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Dry
  • Unconfirmed type:
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Ecology

Habitat

Depth range based on 37 specimens in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 0 - 125
  Temperature range (°C): 7.621 - 7.621
  Nitrate (umol/L): 10.416 - 10.416
  Salinity (PPS): 35.224 - 35.224
  Oxygen (ml/l): 6.137 - 6.137
  Phosphate (umol/l): 0.787 - 0.787
  Silicate (umol/l): 4.908 - 4.908

Graphical representation

Depth range (m): 0 - 125
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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 On rocks and boulders amongst sponges from the low intertidal to 265 m depth. Emarginula fissura is found amongst sponges on which it feeds.
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Wikipedia

Emarginula fissura

Emarginula fissura, the common slit limpet, is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets.[2]

Piero Piani (1984) has demonstrated in a publication that there is no reason to prefer the synonym Emarginula reticulata Sowerby, 1813 over the older name Patella fissura Linnaeus, 1758.[3]

Description[edit source | edit]

The shell of the slit limpet has an elevated conical profile with its apex strongly curved backwards, but never overhanging the posterior margin. The color of the shell is dull white, gray or yellowish. The shell is usually about 10 mm long (but can reach a length of 15 mm), 8 mm high and 6 mm wide. The shell has a reticulate (= net-like) sculpture with 25-35 radial ribs, alternating stronger and weaker, intersecting with spiraled ridges. There is a narrow and deep slit at the anterior margin above the mantle cavity. An exhalent siphon projects thorough this slit. The aperture of the shell occupies the whole undersurface of the shell and lacks an operculum.

The shield-shaped foot is broader anteriorly. It has on each side ten well-developed tentacles at the epipodium (the lateral grooves between foot and mantle). There is an additional tentacle at the right side at the back of the head.

The larvae have a short planktonic development, non-planktotrophic as usual in Vetigastropoda and Patellogastropoda [4]

Distribution and habitat[edit source | edit]

The slit limpet is a common keyhole limpet and can be found along the eastern Atlantic, west European coasts, as far north as Norway and the Faroe Islands and south to the Canary Islands. It is a rare in the western Mediterranean Sea. It thrives on the lower shore and the subtidal zone to a depth of 265 m on rocks and hard substrates where sponges occur.

Feeding habits[edit source | edit]

The slit limpet is carnivorous and feeds on sponges. It is also a herbivorous graze and deposit feeder.

References[edit source | edit]

  • P.J. Hayward, and J.S. Ryland (1996). Handbook of the Marine Fauna of North-West Europe. Oxford University Press. p. 500. ISBN 0-19-854055-8. 
  • 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
  • Seaward, D.R., 1990. Distribution of the marine molluscs of north west Europe. Nature Conservancy Council.
  • Poppe, G.T. & Y. Goto, 1991. European Seashells. Vol. I. 352 pp. Wiesbaden/Verlag Christa Hemmen.
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