Molluscs to three different aquatic biomes.

Introduction: Molluscs are one of the most diverse groups of namby-pamby fleshlys - some(prenominal) in form and habitat. Therefore the study of molluscs has captured the interest of recreational and scientists alike for many centuries they have figured prominently in paleobiological and biological studies, and have served as study organisms in legion(predicate) evolutionary, biomechanical, ecological, physiological, and behavioural studies (Little, 1990) Within the phylum Mollusca, snails and slugs make up the largest molluscan group, and have whence been canvas most extensively. They are so named because their foot spreads come forth when the animal crawls about (Little C 1990). The cerebral ganglion of several species (e.g., Euhadra peliomorpha, genus Aplysia californica, and Lymnaea stagnalis) secretes a neurohormone that stimulates the hermaphroditic sex gland (the reproductive secreter that contains both virile and female characteristics); hermaphroditism is a put ting green condition among molluscs. This gonadotrophic peptide hormone is stored in a usual neurohemal organ until its incommode is stimulated. For example, phototropic information detected by the supposed optical gland can direct the release of the gonadotropic hormone. The hermaphroditic gonad of Euhadra secretes testosterone, which stimulates formation of a gland that releases a pheromone for influencing mating behaviour. The optic gland of the octopus (of the class Cephalopoda) influences increase of the reproductive variety meat on a seasonal basis. It is not known, however, whether any neurohormones are involved or whether this is purely a neurally controlled event.

All molluscs have a similar personify plan with three main part: *         a foot, *         a visceral hoi polloi, *         a mantle. The foot is utilise for movement, the visceral bulk contains most of the internal organs, and the mantle is a heavy flexure of tissue over the visceral mass from which a font may develop. The mantle cavity is an lengthiness of the mantle, which contains the gills, the... thanks for the testify it help me alot! i never really knew this overmuch choke up but now i do! thanks If you phallus to get a full essay, order it on our website: OrderCustomPaper.com

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