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Topic: Operculum (gastropod)

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Operculum - Wikipedia, the free encyclopedia The operculum (plural : opercula or operculums) of gastropods is a corneous plate at the opening of the shell, attached dorsally to the foot. This site also provides fairly extensive material on the growth, development, and physiology of the gastropod operculum as well as hundreds of pictures of both the operculum and it's host shell. The operculum is part of the inferior frontal gyrus of the frontal lobe in the brain. en.wikipedia.org /wiki/Operculum   (371 words)

Journal of Paleontology: LIFE ASSOCIATION OF SHELL AND OPERCULUM OF CERATOPEA ULRICH, 1911 (ORDOVICIAN; GASTROPODA) CERATOPEA Ulrich, 1911, from the Lower Ordovician of North America, Greenland, and Scotland, is one of a few gastropod genera that was established on the calcareous operculum and not the shell. Journal of Paleontology: LIFE ASSOCIATION OF SHELL AND OPERCULUM OF CERATOPEA ULRICH, 1911 (ORDOVICIAN; GASTROPODA) The operculum was capable of being retracted into the aperture at least to the base of the notch on the lip and possibly further if a slit was present. www.findarticles.com /p/articles/mi_qa3790/is_200401/ai_n9368076   (1024 words)

Gastropod Family Index Nevertheless, extensive variations are found in the gastropod's basic body plan, chief among them being the loss of bilateral symmetry in the visceral organs. Generally, most gastropods have an asymmetrically spiral shell, which functions as a portable retreat. All have a big anterior mantle cavity into which the mollusc can withdraw, closing it off with the operculum. nighthawk.tricity.wsu.edu /museum/ArcherdShellCollection/Gastropods.html   (507 words)

conch on Encyclopedia.com In conchs the characteristic gastropod foot is reduced in size and the operculum, a horny plate located on the foot and used to seal the shell opening in many gastropods, has the appearance and function of a claw. CONCH [conch], common name for certain marine gastropod mollusks having a heavy, spiral shell, the whorls of which overlap each other. During locomotion, the operculum secures a foothold in the sand, and the conch jumps forward by means of the quick contraction of a retractor muscle called the columella muscle. www.encyclopedia.com /html/c1/conch.asp   (937 words)

MOLLGL.htm parietal lip - the inner wall of the shell aperture of a gastropod. aperture - the opening of a gastropod shell. umbilicus (Mollusca: Gastropoda) - chink between reflected inner lip of shell aperture and the first body whorl (of shell). www.lucidcentral.com /keys/lwrrdc/public/Aquatics/aemoll/html/MOLLGL.htm   (937 words)

conch In conchs the characteristic gastropod foot is reduced in size and the operculum, a horny plate located on the foot and used to seal the shell opening in many gastropods, has the appearance and function of a claw. During locomotion, the operculum secures a foothold in the sand, and the conch jumps forward by means of the quick contraction of a retractor muscle called the columella muscle. Conch shells range in color from white to red; they have been used by humans to fashion a number of items, such as buttons, ornaments, or the crude trumpets made from the shell of the trumpet conch, www.infoplease.com /ce6/sci/A0813160.html   (465 words)

Glossary/Mollusks In gastropods, the initial whorls of the shell (protoconch) or the first-formed portion of an operculum; in bivalves, the prodissoconch. A thickening of the parietal region or aperture of gastropod shells. False umbilicus : Depression at base of gastropod shell not penetrating deeper than height of body whorl, as in some of the Trochidae. www.fish.washington.edu /naturemapping/mollusks/glossary.html   (465 words)

Websitium operculata: a look at the gastropod operculum Text information on development, composition, evolution and uses of the gastropod operculum is available in the Research Section and is ammended as frequently as possible. Websitium operculata: a look at the gastropod operculum See images of some of these ancient fossil cephalopods. www.nansaidh.us /operc/index1.html   (224 words)

Gastropod Family Index The foot is usually in the form of a flat, creeping sole, which may bear an operculum for closing the shell. Nevertheless, extensive variations are found in the gastropod's basic body plan, chief among them being the loss of bilateral symmetry in the visceral organs. The shell, itself, is to some extent contoured to the shape of body appendages. nighthawk.tricity.wsu.edu /museum/ArcherdShellCollection/Gastropods.html   (224 words)

Re: What is the life cycle of a sea snail? What type of eyes do they have? This is thought to have evolved to allow the operculum to be the last part of the body pulled into the shell, allowing the whole body to be protected. This theory of torsion was first described by the great (if rather eccentric) zoologist Walter Garstang in 1928, he presented the theory in the form of a verse called "The Ballad of the Veliger or How the Gastropod Got Its Twist". All land snails and some sea snails have direct development, with both the trochophore and veliger stages being passed inside the egg, and the young being born as mini-adults crawling out of the adult shell. www.madsci.org /posts/archives/may99/927203558.Zo.r.html   (224 words)

Parasitology: Digeneans text The miracidium then infects a gastropod host, occasionally a lamellibranch mollusc or a scaphopod mollusc, and in one or two instances an annelid is the intermediate host. The viscous cushion is composed of mucopolysaccharide that absorbs water and swells, increasing the pressure inside the egg (the miracidium is temporarily compressed), until the operculum flies open. Infection of the intermediate host is either by direct penetration by a free-swimming hatched miracidium or by the ingestion of the digenean egg by the mollusc. www.aber.ac.uk /~mpgwww/Edu/Digen/DigenTxt.html   (224 words)

Vermetidae (Worm Shells) Unlike Aletes semiquadrus, it does not have an operculum. Most Vermetidae gastropods grow in irregular masses --often even more irregular than shown in the particular specimen pictured here. Three gastropod families among the Cerithiacea superfamily make coiled shells much like the tube-building annelid worms. nighthawk.tricity.wsu.edu /museum/ArcherdShellCollection/Gastropoda/Vermetidae.html   (177 words)

Aperture (mollusc) - Wikipedia, the free encyclopedia Aperture is the opening in the shell of a gastropod, through which the snail emerges. This opening can be closed, in most cases, by an operculum. The aperture is generally elliptical or oval, but its upper part (the parietal wall) can have a truncated appearance. en.wikipedia.org /wiki/Aperture_(mollusc)   (177 words)

Aperture (mollusc) Definition / Aperture (mollusc) Research Aperture is the opening in the shell of a gastropod, through which the snail emerges. This opening can be closed, in most cases, by an operculum. The aperture is generally elliptical or oval, but its upper part (the parietal wall) can have a truncated appearance. www.elresearch.com /Aperture_%28mollusc%29   (177 words)

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