BIOLOGY OF MYTILIDS ppt

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Sessile. Inhibit in rocky intertidal zone. Benthic organism. Laterally compressed body enclosed in shell with 2 valves. Soft body of mussel is enveloped in a thin semi transparent covering – MANTLE.

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Starfish are also referred to as sea stars because of their star-shaped appearance. They are a part of the phylum Echinodermata and are related to sand dollars, sea urchins, and sea cucumbers. Starfish belong to the class Asteroidea, derived from the Greek words “aster” (a star) and “eidos“ (form, likeness, appearance). There are more than 1600 species of starfish alive today, and they have an important role in the community structure of the ocean floor. All echinoderms share similar pentamerous radial symmetry and spiny skin characteristics, although sea stars differ slightly because they have five or more arms large enough to contain space for digestive and reproductive glands.

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Characteristics - Ariidae Medium to large sized fish. Two pairs of nostrils closely on each side. Paired maxillary and mental barbels present totally 4-6. Dorsal fin short, with long more or less serrated spine preceded by a very short one. Caudal fin deeply forked. Adipose fin present. Pectoral fin low set, with serrated spine. Colour – Usually greyish blue, dark grey, yellow or brown sometimes with black patches or in some with silvery lateral stripe; pale to white below.

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Marine Birds Marine birds are those living in and making their living from the marine environment, which includes coastal areas, islands, estuaries, wetlands, and oceanic islands. Consists of 328 species. Sphenisciformes -Penguins Procellariiformes -Albatrosses, petrels, storm-petrels, fulmars, shearwaters Ciconiiformes - Herons, egrets, storks, ibis, spoonbills Pelecaniformes - Pelicans, frigatebirds, gannets, boobies, cormorants, anhingas Charadrii formes - Shorebirds, skuas, j

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INTRODUCTION Gorgonians are marine coelenterates (referring to the hollow body cavity) of the class Anthozoa, which include sea fans, sea whips, corals, sea anemones, and other related species. Gorgonids are soft corals commonly known as sea fans or sea whips, coming under the subclass Octocorallia and have eightfold radial symmetry. It composed of numerous polyps—cylindrical sessile (attached) forms—that grow together in a flat fanlike pattern. They are colonial animals that have a beautiful, branching structure that is covered by soft tissue and are generally found in warm waters and around reefs.

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Introduction The Gastropods - Phylum Mollusca - Second largest class. Includes - sea snails and slugs, as well as freshwater snails, freshwater limpets, and land snails and slugs. The most highly diversified class in the phylum, with 65,000 to 80,000 living snail and slug species. Older classification of the gastropods Opisthobranchia (gills to the right and behind the heart). Gymnomorpha (no shell). Prosobranchia (gills in front of the heart). Pulmonata (with a lung instead of gills).

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Corals are marine invertebrates in class Anthozoa of phylum Cnidaria typically living in compact colonies of many identical individual "polyps". Corals are gastrovascular marine organisms. Each one of these animals is known as a coral "polyp". Coral Polyps are tiny, primitive marine organisms. A single polyp has a tube-shaped body with a mouth which is surrounded by tentacles. The polyp of hard corals produces a stony skeleton of calcium carbonate which form the base. Often the skeleton forms a cup-like structure in which the polyp lives. Coral polyps in colonies make up the cora reefs.

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The majority of adult sea snakes species grow to between 120 and 150 cm (4 and 5 ft) in length, with the largest, Hydrophis spiralis. Most sea snakes are venomous, except the genus Emydocephalus, which feeds almost exclusively on fish eggs. Sea snakes are extensively adapted to a fully aquatic life and are unable to move on land, except for the sea kraits, which have limited land movement All sea snakes have paddle-like tails and many have laterally compressed bodies that give them an eel-like appearance. They are cold blooded animals

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Crustaceans/Crustacea, form a very large and diversified group of arthropods, which includes 52,000 described species. Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. Distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous limbs, and by the nauplius form of the larvae. Crustaceans exhibit a number of larval forms, of which the earliest and most characteristic is the nauplius. Several larval forms are met within Crustaceans and specified terms are applied to each one of them.

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