Invertebrates -1 sponges & cnidarians

Invertebrates -1 sponges & cnidarians -...

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Invertebrates - Sponges & cnidarians Page 1 of 6 Invertebrates The phyla we will discuss are indicated Sponges (Phylum Calcarea & Phylum Silicea) 1. General characteristics 2. Structure (a) No plane of symmetry (b) Adults are sessile & immobile (c) Pores (ostia)
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Invertebrates - Sponges & cnidarians Page 2 of 6 (d) Spicules (e) Several cell types around the spongocoel, but no true tissues Mesophyl Epidermis Spongocoel Chooanocytes Amoebocytes
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Invertebrates - Sponges & cnidarians Page 3 of 6 3. Feeding (a) Suspension feeders (b) Occurs in choanocytes 4. Reproduction (a) Some asexual reproduction (b) Mostly hermaphrodites, but cross fertilization (c) Gametes are produced in choanocytes & move in amoebocyes (d) New sperm move in via water currents (e) Zygote develops in mesohyl 5. Toxins & colour (a) Toxins used in chemical warefare (b) Colour
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Invertebrates - Sponges & cnidarians Page 4 of 6 Cnidarians (Phylum Cnidaria) 1. General characteristics & representatives 2. Two body forms (Fig. 33.5)
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Invertebrates -1 sponges & cnidarians -...

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