Siphonal canal

Last updated
A shell of Penion cuvieranus cuvieranus, with the long siphonal canal visible extending toward the bottom of the image, at the anterior end of the shell. Penion maximus (Tryon, 1881).jpg
A shell of Penion cuvieranus cuvieranus , with the long siphonal canal visible extending toward the bottom of the image, at the anterior end of the shell.

The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is drawn into the mantle cavity and over the gill and which serves as a chemoreceptor to locate food. In certain groups of carnivorous snails, where the siphon is particularly long, the structure of the shell has been modified in order to house and protect the soft structure of the siphon. Thus the siphonal canal is a semi-tubular extension of the aperture of the shell through which the siphon is extended when the animal is active.

Contents

One gastropod whose shell has an exceptionally long siphonal canal is the Venus comb murex. Some gastropods have a simple siphonal notch at the edge of the aperture instead of a canal.

See also

Related Research Articles

Siphon (mollusc) Anatomical structure which is part of the body of some aquatic molluscs

A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda.

Mantle (mollusc) Part of the anatomy of molluscs

The mantle is a significant part of the anatomy of molluscs: it is the dorsal body wall which covers the visceral mass and usually protrudes in the form of flaps well beyond the visceral mass itself.

Aperture (mollusc) The main opening of the shell, where the head-foot part of the body of the animal emerges

The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc.

Operculum (gastropod) A hard structure which closes the aperture of a gastropod when the animal retreats into the shell

The operculum, meaning little lid, is a corneous or calcareous anatomical structure like a trapdoor which exists in many groups of sea snails and freshwater snails, and also in a few groups of land snails; the structure is found in some marine and freshwater gastropods, and in a minority of terrestrial gastropods, including the families Helicinidae, Cyclophoridae, Aciculidae, Maizaniidae, Pomatiidae, etc.

Olive snail Family of molluscs

Olive snails, also known as olive shells and olives, scientific name Olividae, are a taxonomic family of medium to large predatory sea snails with smooth, shiny, elongated oval-shaped shells.

Gastropod shell Part of the body of a gastropod or snail

The gastropod shell is part of the body of a gastropod or snail, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or the shell is reduced such that the body cannot be retracted within (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group. An excellent source for terminology of the gastropod shell is "How to Know the Eastern Land Snails" by John B. Burch now freely available at the Hathi Trust Digital Library.

Persiculinae Subfamily of sea snails

Persiculinae is a taxonomic subfamily of minute to small predatory sea snails, marine gastropod mollusks. This subfamily includes several species which are micromollusks.

Columella (gastropod)

The columella or pillar is a central anatomical feature of a coiled snail shell, a gastropod shell. The columella is often only clearly visible as a structure when the shell is broken, sliced in half vertically, or viewed as an X-ray image.

Olivellinae Subfamily of gastropods

Olivellinae, common name the "dwarf olives", are a subfamily of small predatory sea snails with smooth, shiny, elongated oval-shaped shells. The shells sometimes show muted but attractive colors, and may have some patterning.

Siphonal notch

A siphonal notch is a feature of the shell anatomy in some sea snails, marine gastropod mollusks.

Stromboid notch

The stromboid notch is an anatomical feature which is found in the shell of one taxonomic family of medium-sized to large sea snails, the conches.

The respiratory system of gastropods varies greatly in form. These variations were once used as a basis for dividing the group into subclasses. The majority of marine gastropods breathe through a single gill, supplied with oxygen by a current of water through the mantle cavity. This current is U-shaped, so that it also flushes waste products away from the anus, which is located above the animal's head, and would otherwise cause a problem with fouling.

The following is a glossary of common English language and scientific terms used in the description of gastropods.

<i>Oenopota harpa</i> Species of gastropod

Oenopota harpa is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.

<i>Xanthodaphne sofia</i> Species of gastropod

Xanthodaphne sofia is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.

Muricopsinae Subfamily of gastropods

Muricopsinae is a taxonomic subfamily of predatory sea snails, marine gastropod mollusks within the large family Muricidae, the murex snails and rock snails.

<i>Halistylus</i> Genus of gastropods

Halistylus is a genus of very small sea snails, marine gastropod mollusks in the family Trochidae, the top snails.

Anal sulcus

The anal sulcus, also called the anal sinus or anal canal, in Gastropods is a notch, a shelly tube at the top of the aperture. It is the first notch close to the suture. It houses the anal siphon through which the snail expels water and waste products.

This outline is provided as an overview of, and organized list of articles relevant to, the subject of gastropods :

<i>Lamellaria perspicua</i> Species of gastropod

Lamellaria perspicua, commonly known as the transparent lamellaria, is a species of small, slug-like sea snail, a marine gastropod mollusc in the family Velutinidae. It is native to the northeastern Atlantic Ocean and the Mediterranean Sea, where it feeds on colonial ascidians.

References

    Further reading