b112_Lecture_33_p01

b112_Lecture_33_p01 - 2/25/2008 BIOL112 Chapter33...

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2/25/2008 1 BIOL 112–Chapter 33 The Invertebrates 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 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 Grantia (class Calcarea)
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2/25/2008 2 Class Hexactinellida Yellow Barrel Sponge (class Demospongae) Encrusting Sponge Phylum Cnidaria ~ 10,000 species Simple body plan with two forms Predatory–Capture using tentacles with cnidocytes
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2/25/2008 3 Very simple muscles made of bundles of contractile microfilaments Movements controlled by a nerve net (no brain brain) Sensory receptors feed into nerve net allowing stimulus/response Colonial Hydroid on Coralline Algae Velella velella Various Hydrozoan Medusas – California Coast
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2/25/2008 4 Pelagia colorata Haliclystus – Stalked Jellyfish Chrysaora fuscescens –Sea Nettle Sea Wasp – Chironex fleckeri Sea Wasp Stings Anthopleura elegantissima – Aggregating Anemone
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2/25/2008 5 Tealia crassicornis Balanophylla elegans – Orange Cup Coral Cup coral with tentacles extended Bilateria Acoelomates–Phylum Platyhelminthes ~ 20,000 species Free Body dorsoventrally flattened More complex (have mesoderm) with true muscles, gastrovascular cavity with one opening 4 Classes – Turbellaria, Monogenea, Trematoda & Cestoidea
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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_33_p01 - 2/25/2008 BIOL112 Chapter33...

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