Naylor_2010.sponges

Naylor_2010.sponges - The major lineages of animals Monday,...

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Unformatted text preview: The major lineages of animals Monday, June 13, 2011 The major lineages of animals Monday, June 13, 2011 Phylum Porifera The sponges Monday, June 13, 2011 Sponges neither look nor behave like animals. They were not accepted as animals until the mid 19th century. Hence their grouping in the grade parazoa (alongside animals) Monday, June 13, 2011 The phylum name Porifera, meaning "pore- bearing, contains approx. 10,000 living species, approx. 200 of which are freshwater. The remainder are marine. Sponges neither look nor behave like animals. They were not accepted as animals until the mid 19th century. Hence their grouping in the grade parazoa (alongside animals) Monday, June 13, 2011 Sponges come in diverse shapes, sizes and colours and range from shallow waters to abyssal depths. They are generally asymmetrical animals with sac-like bodies. Monday, June 13, 2011 Sponges come in diverse shapes, sizes and colours and range from shallow waters to abyssal depths. They are generally asymmetrical animals with sac-like bodies. They are sessile filter feeders that rely on system of self generated water currents to bring in food and oxygen and to remove water products. Monday, June 13, 2011 Sponges have a long evolutionary history with more than 1000 fossil forms identified, earliest of which is 550 million years old. Monday, June 13, 2011 Sponges have a long evolutionary history with more than 1000 fossil forms identified, earliest of which is 550 million years old. Most ancient are the glass sponges that formed huge reefs which, by the time they disappeared 140 mya, were up to 7000 kilometers long (Great Barrier reef is 2000 kilometers) Monday, June 13, 2011 Sponges have a long evolutionary history with more than 1000 fossil forms identified, earliest of which is 550 million years old. Most ancient are the glass sponges that formed huge reefs which, by the time they disappeared 140 mya, were up to 7000 kilometers long (Great Barrier reef is 2000 kilometers) In 1991 glass sponge reefs covering 300 sq. kilometers were re- discovered in the Hecate Strait off the coast of western Canada Monday, June 13, 2011 Evolution and characteristics: Monday, June 13, 2011 Evolution and characteristics: Represent the cellular grade of animal evolution. They do not possess true tissues, merely specialized cell layers. Epidermal cells on outer surface, collar cells in inner cavity. Monday, June 13, 2011 Evolution and characteristics: Represent the cellular grade of animal evolution. They do not possess true tissues, merely specialized cell layers. Epidermal cells on outer surface, collar cells in inner cavity. Monday, June 13, 2011 Evolution and characteristics: Represent the cellular grade of animal evolution....
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This note was uploaded on 06/13/2011 for the course BIOLOGY bsc2011L taught by Professor Dr.tschinkel during the Fall '11 term at FSU.

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Naylor_2010.sponges - The major lineages of animals Monday,...

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