b112_Lecture_33a

b112_Lecture_33a - BIOL 112 Chapter 33 The Invertebrates...

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BIOL 112 – Chapter 33 The Invertebrates
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General Points About Invertebrates Contains all the phyla except part of phylum Chordata Most species are marine or aquatic Defining characteristic – Lack of a backbone
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Phylum Porifera – Sponges ~ 9,000 species Sessile animals with no true tissues (no nerves or muscles) Primarily marine Suspension feeders Hermaphroditic (sequentially) Can reproduce asexually by fragmentation
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Grantia (class Calcarea)
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Class Hexactinellida
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Yellow Barrel Sponge (class Demospongae)
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Encrusting Sponge
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Phylum Cnidaria ~ 10,000 species Simple body plan with two forms Predatory – Capture using tentacles with cnidocytes
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Very simple muscles made of bundles of contractile microfilaments Movements controlled by a nerve net (no brain) Sensory receptors feed into nerve net allowing stimulus/response
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Colonial Hydroid on Coralline Algae
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Velella velella
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California Coast
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This note was uploaded on 06/18/2009 for the course BIOL- 112 taught by Professor Bryanness during the Fall '09 term at Pacific Union.

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b112_Lecture_33a - BIOL 112 Chapter 33 The Invertebrates...

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