Phylum Echinodermata & Molluska

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Phylum Echinodermata and Phylum Mollusca:

Phylum Echinodermata and Phylum Mollusca

Phylum Echinodermata :

Phylum Echinodermata

Echinoderms (Phylum Echinodermata) are a phylum of marine animals. Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone. Aside from the hard-to-classifyArkarua, the first definitive members of the phylum appeared near the start of the Cambrian period. :

Echinoderms (Phylum Echinodermata ) are a phylum of marine animals . Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone . Aside from the hard-to- classify Arkarua , the first definitive members of the phylum appeared near the start of the Cambrian period.

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General Characteristics Adults exhibit pentamerous radial symmetry Radially symmetry is secondary; larvae are bilaterally symmetrical and undergo metamorphosis to become radially symmetrical adults. Echinoderm larva

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General Characteristics cont. Poorly ganglionated ; possess few sensory structures Body wall contains an endoskeleton of calcareous plates - ossicles

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General Characteristics cont. Possess a network of canals throughout the body - water vascular system . The canals are connected to extensions called tube feet (=podia), located on the oral surface The water vascular system is important for locomotion, feeding, and gas exchange.

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Sexes are separate; gametes shed into the water; fertilization is extalern

STRUCTURES:

STRUCTURES

~ Body is radially symmetrical, star shaped, spherical or elongate, ~ Exoskeleton is spiny. ~ Head is absent and five radially arranged arms present. ~ Locomotion is with the help of tube feet. ~ Sexes are separate. :

~ Body is radially symmetrical, star shaped, spherical or elongate, ~ Exoskeleton is spiny. ~ Head is absent and five radially arranged arms present. ~ Locomotion is with the help of tube feet. ~ Sexes are separate.

Examples::

Examples: Sea star,

Examples::

Examples: Sea Urchin,

Examples::

Examples: Sea cucumber

Examples::

Examples: Sea Lilies

Phylum Mollusca:

Phylum Mollusca

The Mollusca   common name molluscs or mollusks , are a large phylum of invertebrate animals. There are around 85,000 recognized extantspecies of molluscs. Mollusca is the largest marine phylum, comprising about 23% of all the named marine organisms.:

The Mollusca common name molluscs or mollusks , are a large phylum of invertebrate animals. There are around 85,000 recognized extant species of molluscs. Mollusca is the largest marine phylum, comprising about 23% of all the named marine organisms .

The phylum Mollusca is divided into five main classes: pelecypods, or bivalves (Pelecypoda, or Bivalvia), includes oysters, clams, mussels; gastropods (Gastropoda), snails, sea slugs; cephalopods (Cephalopoda), squids, octopuses; scaphopods (Scaphopoda), tooth shells; Polyplacophora, chitons. There are a few other mollusc classes. :

The phylum Mollusca is divided into five main classes: pelecypods , or bivalves ( Pelecypoda , or Bivalvia ), includes oysters, clams, mussels; gastropods ( Gastropoda ), snails, sea slugs; cephalopods ( Cephalopoda ), squids, octopuses; scaphopods ( Scaphopoda ), tooth shells; Polyplacophora , chitons . There are a few other mollusc classes.

Molluscs can be found in the sea, freshwater and in terrestrial environments. :

Molluscs can be found in the sea, freshwater and in terrestrial environments.

General Characteristics :

General Characteristics All mollusks have a mantle, which is a soft outer layer of their bodies. In mollusks , the mantle produces a protective shell. The muscular foot is the dominant feature of mollusks . It has different forms in a snail, clam, and a squid. Between the foot and the mantle is the visceral mass, which contains the internal organs.

Gills or lungs are enclosed in the mantle. Some are sessile, some use their shells for movement, some secrete mucous over which they move, some swim by forcing water through their mantle cavity. Live in diverse habitats, so they may be filter-feeders, predators, or herbivores. :

Gills or lungs are enclosed in the mantle. Some are sessile, some use their shells for movement, some secrete mucous over which they move, some swim by forcing water through their mantle cavity. Live in diverse habitats, so they may be filter-feeders, predators, or herbivores.

All have a complete, one-way digestive tract, although it does not have any specialized regions like annelids. Only reproduce sexually. Most are separately sexed. :

All have a complete, one-way digestive tract, although it does not have any specialized regions like annelids. Only reproduce sexually. Most are separately sexed. Nephridia excrete wastes, but they only have one or two in their whole bodies.

Molluscs:

Molluscs Have adapted to a wide variety of habitats Terrestrial, marine, benthic, and accomplished swimmers. Phylum Mollusca 22

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Structures

The Molluscan Structure:

The Molluscan Structure The body plan is similar and distinct from all other phyla The Mollusca body plan includes: A large muscular foot A radula Mantle and mantle cavity Usually a small head Soft unsegmented body A hard non-living calcareous shell Phylum Mollusca 24

Examples::

Examples: Cowrie Shell & top Shell

Examples::

Examples: Scalop & Snail

Examples::

Examples: Cone Shell

Examples::

Examples: Octupus & Squid

End!!! :

End!!! Sharlene Corsat Reilourd M iranda Carmela de Torres Kassandra M ercado Lorielyn L ibuit

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