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Topic: Aperture (mollusc)

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	Palaeos Metazoa: Mollusca: Glossary
		Branchial (GR branchia=gills) The ventral or inhalant aperture.
		Nephridium ne-phrid’I-um (Gr nephros= a kidney) one of the tubular renal organs of the molluscs.
		Ventral ven’tral (L venter=the belly) Of, pertaining to, or situated on, the lower side of a dorsoventral organism; on the apertural surface of a gastropod shell; the edge remote from the hinge in a bivalve; the ventral margin is opposite the umbones.
	www.palaeos.com /Invertebrates/Molluscs/Mollusca.Glossary.html (3521 words)

	Mollusca - LoveToKnow 1911 (Site not responding. Last check: 2007-10-09)
		Similarly an anal aperture is formed in connexion with a special invagination which meets the hinder part of the met-enteron, and is termed the proctodaeum.
		Thus in the primitive mollusc the mantle-cavity contains a symmetrical group of structures at the posterior end of the body, and this group of structures is called the pallial complex.
		It consists of the anus in the middle, a renal organ and renal aperture on each side of this, and a ctenidium outside or anterior to the renal organ, an osphradium being situated at the base of the ctenidium.
	www.1911encyclopedia.org /Mollusca (6529 words)

	Gastropoda - LoveToKnow 1911 (Site not responding. Last check: 2007-10-09)
		The second movement is a lateral torsion of the visceral mass, the foot remaining a fixed point; this torsion occurs in a plane approximately at right angles to that of the first movement, and carries the pallial aperture and the anus from behind forwards.
		The minute structure of the epithelium which clothes it, as well as the origin of the nerve which is distributed to the parabranchia, proves it to be the same organ which is found universally in molluscs at the base of each gill-plume, and tests the indrawn current of water by the sense of ?,g smell.
		The hermaphrodite aperture is on the right side near the opening of the pallial cavity, and a ciliated groove conducts the spermatozoa to the penis, which is situated more anteriorly.
	www.1911encyclopedia.org /G/GA/GASTROPODA.htm (14552 words)

	Schulers Books (My Tropic Isle - 18/40)
		The foot of the mollusc is extended into a peduncle, consisting of fibres and tendons, by which the animal is a fixture to a spur of coral.
		Quite independent of their host for existence, these molluscs are not to be stigmatised as parasites, though the individual spur to which each is attached is invariably destroyed by the union, merely sufficient remaining for the support of the intruder.
		Interest in the mollusc became secondary upon the discovery of the host and in consideration of the part it plays in the production of one of the special effects of coral reefs; but the mollusc serves another and timely purpose--purely personal and yet not to be disregarded.
	www.schulers.com /books/ej/m/My_Tropic_Isle/My_Tropic_Isle18.htm (1728 words)

	Glossary
		Branchial (GR branchia=gills) The ventral or inhalent aperture.
		Scientific term for the univalves with the stomach situated in the region of the foot, shell is in one piece and usually spirally coiled and is asymmetrical.
		Ventral ven’tral (L venter=the belly) The edge remote from the hinge in a bivalve; the ventral margin is opposite the umbonnes.
	www.manandmollusc.net /glossary.html (2103 words)

	Slugs and Snails of Western Washington (Site not responding. Last check: 2007-10-09)
		Full-grown shells (with a reflected lip) lacking a tooth-like structure in the aperture; whorls with prominent radial ribs; shell 24 to 35 mm diameter.
		Shell bearing one tooth-like lamella on the inner edge of the aperture (lamella continues through the shell’s interior and is visible in both juvenile and full-grown shells); shell translucent whitish, conic and regularly tapering; full-grown shells with a strongly reflected lip; head of animal with one pair of tentacles and eyes at base of tentacles.
		Aperture with 4 teeth; aperture width about half of shell width; lower right edge of aperture more vertical (in apertural view); shell generally less stout with penultimate whorl usually smaller in diameter than final whorl; shell usually larger, 2.3 to 2.7 mm tall.
	www.evergreen.edu /ants/TESCBiota/mollusc/key/webkey.htm (3416 words)

	aperture (Site not responding. Last check: 2007-10-09)
		As an emitter, antenna aperture is the diameter of the cross-section of an antenna's radiation pattern in the direction of highest gain.
		The aperture diameter is expressed in f-stops; the lower the number, the larger the aperture.
		In cameras, the aperture is usually variable in the form of an iris diaphragm and regulates the amount of light which passes through the lens to the film.
	dict.vocamania.com /aperture.aspx (1041 words)

	The Freshwater Snails of Florida A Manual for Identification (Site not responding. Last check: 2007-10-09)
		Aperture of shell closed by an operculum (snail must be collected live because the operculum is lost soon after death).
		The coloration of the aperture and the embryonic shell is not consistent within single population samples, and the contour of the outer lip is highly variable within single drainage systems and with the age of the specimens examined.
		Aperture elliptical and loosely attached to or slightly separated from preceding whorl; 4.5-4.9 whorls.
	www.flmnh.ufl.edu /natsci/malacology/fl-snail/snails1.htm (9038 words)

	GASTROPODS
		"snails") are univalved molluscs (though some have opercula for the shell) with the body and (typically) the shell both "twisted".
		The "apex" is the pointed, oldest end of the shell away from the "aperture", where the body emerges from the shell.
		The apex is at the "posterior" end and the aperture on the "anterior" end of the shell because when the snail moves it drags the shell behind it, apex rearward.
	itc.gsw.edu /faculty/bcarter/paleo/labs/moll/gast.htm (494 words)

	Palaeos Metazoa: Mollusca: Shell Morphology
		The model specifies the shape of the aperture, or generating curve, the axis of coiling, the size ratio (W) of successive generating curves, the distance (D) of the generating curve from the axis, and the proportion (T) of the height of one generating curve that is covered by the successive gyres."
		This is basically the same as the shape of the aperture, and may vary greatly in various molluscan species, especially in shelled cephalopods.
		One can easily see how some molluscs, and indeed some spiral forms in nature (since these principles can be widely applied) developed shells where certain parameters have a high value, and others a low value.
	www.palaeos.com /Invertebrates/Molluscs/Mollusca.Shell.html (956 words)

	Common Warrener
		The aperture is circular, covered with a thick and circular calcareous operculum, marked on the underside with a flat spiral.
		The aperture is protected by a thick, white operculum.
		This mollusc grazes on algae found in the low tide levels on the shore.
	www.mesa.edu.au /friends/seashores/t_undulata.html (258 words)

	Mollusca
		Evolutionarily, the molluscs apparently derive from the platyhelminthes.
		The molluscs are a large group, second only to arthropods in number of species.
		The name "mollusc" is derived from the Latin molluscus ("soft"), indicating that the molluscs are soft bodied animals.
	www.esu.edu /~milewski/intro_biol_two/lab__11_mollusca/Mollusca.html (1076 words)

	serchside formular - arama formu
		A mollusc with a foot, a head bearing tentacles, and eight shelly plates held together by a girdle.
		Literally "stomach-footed"; a mollusc with a head hearing tentacles and eyes, a foot, and a one-piece shell (sometimes with no shell at all).
		The tube or gutter at the front (lower) end of the aperture, to hold the front siphon of a gastropod.
	nautilus-shells.tripod.com /searchside.htm (1160 words)

	Gastropoda
		Archimollusc - a hypothetical ancestral mollusc from the Cambrian, in which all the basic structures of today's molluscs are present, though not specialized.
		Mollusc - any of a group of unsegmented animals of Kingdom Animalia, with body divisible into a head-foot and visceral mass, the mass covered by a mantle that secretes a calcareous shell.
		Operculum - a calcareous 'plug' attached to the foot of some prosobranchs, drawn in behind the snail when it is retreating into it's shell to seal the aperture against predators or moisture loss.
	hoopermuseum.earthsci.carleton.ca /gastropoda/glossary1.html (621 words)

	Aperture (disambiguation) - Wikipedia, the free encyclopedia
		Aperture (computer memory), a region of the physical address space associated with a particular device or memory unit
		Aperture (mollusc), the opening in the shell of a gastropod (mollusc)
		Aperture (botany), a weaker spot in the wall of a pollen grain
	en.wikipedia.org /wiki/Aperture_(disambiguation) (194 words)

	Aperture And F Stop \| Aperture Depth Of Field (Site not responding. Last check: 2007-10-09)
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	drcn.info /aperture-and-f-stop.htm (373 words)

	Fuel and financial savings for operators of small fishing vessels
		When the diameter of the propeller is limited by the size of the aperture, it may often be better to keep shaft speed low and absorb the power through the use of more blades.
		Often the shape of the aperture in the hull is such that the more the propeller blade is raked aft, the larger the propeller diameter that can be fitted, and rake becomes very beneficial.
		A small aperture requires the installation of a small-diameter propeller, which may not be able to absorb all of the engine's power efficiently, thus resulting in inefficient performance, engine damage or poor towing capacity.
	www.fao.org /docrep/X0487E/x0487e04.htm (7538 words)

	1 Apr 04 (Site not responding. Last check: 2007-10-09)
		Pseudofeces from the labial palps are deposited on the mantle rejection tracts, and voided from the inhalent aperture.
		Molluscs, being one of the most diverse groups of marine invertebrates and playing crucial roles in the functioning of coastal habitats provide a unique opportunity to test hypotheses about the effects of urbanisation on shallow water assemblages.
		The implications for the persistence of populations of molluscs and for key ecological processes will be discussed according to natural history traits, functional role and natural patterns of abundance and distribution of species.
	www.mollusckey.com /perth/abstracts2.htm (15909 words)

	Aperture Antenna \| Coolmelcom Kosmic Aperture (Site not responding. Last check: 2007-10-09)
		Observing the great success that many companies are having on the Internet aperture antenna business people reach new goals with the increased business A real advantage that comes with a success Internet option gives aperture artistry stores have over large shopping mall aperture antenna enterprises is that the cost of operations is considerably less.
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	dglu.info /aperture-antenna.htm (287 words)

	paleolab7molluscapart1
		The Mollusc Phylum is of tremendous importance to paleontologists, because it includes several classes of common, diverse, and easily fossilized organisms.
		The shells of many molluscs represent not only paleoecological information, but also provide geochemical information in the form of stable and radiogenic isotope signatures, trace element and heavy metal data, and amino acids used in amino acid racemization dating.
		The gastropods are molluscs with a distinct head (with nerve ganglia, eyes), muscular foot (for locomotion) and visceral mass enclosed in a mantle.
	www.personal.kent.edu /~alisonjs/paleo/paleolab7molluscapart1.htm (1217 words)

	Snailery
		In some specimens a small white tooth resembling delicate porcelain, may be found on the inner wall of the aperture.
		In construction the shell has seven spiral turns, and is dark brown in color with a broad band of still darker brown.
		The rim of the aperture is thick and white, while the interior possesses a purplish tint.
	www.herper.com /molluscs/snailery.html (3311 words)

	Developmental modeling of Shell Form
		By using these developmental parameters, we can look at two shells and ask what developmental changes would be necessary to transform one into the other.
		Many limpets are not coiled at all, and we might ask whether a perfectly conical limpet could be derived from a coiled ancestor in a similarly easy way.
		Below are two views of a specimen of Didymoceras (from the Peabody Museum collection), a heteromorph that began life as a conico spiral and then abruptly switched to a different growth pattern.
	www.webpages.ttu.edu /searice/shell.html (718 words)

	Aquatic Mollusk Survey Protocols: Masked Duskysnail - Lyogyrus n. sp. 2
		Burch does not show consistencies in aperture shape or operculum either between or within the genera in his illustrations.
		The snail is very high-spired, about 4 mm tall, slightly brownish, with evenly convex whorls; it has a round, unreinforced aperture margin, with up to 8 whorls as an adult.
		Mollusc Species of Special Concern within the Range of the Northern Spotted Owl.
	www.blm.gov /or/plans/surveyandmanage/MR/AQMollusks/section5.htm (2309 words)

	glossary.htm
		: The end of the cowrie that is nearest to the head of the living mollusc.
		: The side of the aperture that is closest to the central axis of the cowrie.
		: The lip of the aperture that is away from the columella.
	www.aegeanshells.gr /glossary.htm (519 words)

	Palmer - MacCoil
		Increasing the value of this parameter, shifts the center of the initial generating curve further from the axis of coiling, one pixel at a time.
		Coiling Parameter: Determines the rate at which the center of the aperture moves down the axis of coiling relative to the rate at which it moves away from the axis of coiling (higher values yield taller shells).
		Aperture Shape: Sets the ratio of the vertical dimension of the generating curve over the horizontal dimension (higher values yield more vertically elongate apertures).
	www2.biology.ualberta.ca /palmer/progs/MacCoil/MacCoil.htm (538 words)

	Tubercled Noddiwink
		The operculum, which protectively covers the aperture to hold in moisture, is horny and thin.
		The shell colour is light blue-grey with fawn nodules.
		The aperture is brown with a pale brown band near the base.
	www.mesa.edu.au /friends/seashores/n_pyramidalis.html (299 words)

	aperture - Hutchinson encyclopedia article about aperture (Site not responding. Last check: 2007-10-09)
		Controlled by the iris diaphragm, it can be set mechanically or electronically at various diameters.
		The aperture ratio or relative aperture, more commonly known as the f-number, is a number defined as the focal length of the lens divided by the effective diameter of the aperture.
		A smaller f-number implies a larger diameter lens and therefore more light available for high-speed photography, or for work in poorly illuminated areas.
	encyclopedia.farlex.com /aperture (233 words)

	British Non-marine Molluscs - Characters
		Mantle of molluscs: the fleshy or membranous covering of that part of the body (usually anterior) which usually secretes the shell, and which encloses the ‘mantle cavity’.
		The aperture of a dextral shell will then lie to the right of the median axis, that of a sinistral one to the left.
		Illustrations of the principal structures referred to in routine descriptions of land and freshwater molluscs, and instructions for measuring heights and widths of shells, can be accessed via the ‘Mollusc morphology’ toolbar button.
	delta-intkey.com /britmo/www/chars.htm (1674 words)

	Killer Coneshells
		There are three basic groups of Cone species, based upon what they feed upon: worms (vermivores), molluscs (mulluscovores) and fish (piscovores).
		Many dozens of conotoxins are known, and several kinds are being investigated as possible drugs, mainly for pain killing or analgesic properties.
		Taxonomy of the Phylum Mollusca Voyages of the H.M. Bark Endeavour and its Replica
	www.manandmollusc.net /MolluscMomentPast/mollusc_moment.html (981 words)

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