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17 Cards in this Set
- Front
- Back
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METAZOANS
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"# Divided into three Branches:
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Mesozoa (Branch & Phylum):
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"""Missing link"" between the Protists
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Two Classes of: Mesozoa
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1. Rhombozoa (Spinning top shape)EG(cuttlefishes; squids; octopuses)2. Orthonectida (Straight swimmer)
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Parazoans
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Phylum: Placozoa (Plate animal); # Phylum: Porifera (Sponges a.k.a. pore bearing animals)
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Placozoa (Plate animal);
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"Single species phylum: Trichoplax adhaerens;
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Porifera (Sponges a.k.a. pore bearing animals)
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"Calcarea ( Calcispongiae) a.k.a. Lime Sponges
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General Characteristics of Poriferans
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"It can express radial symmetry or none at all;
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Cell Types Associated with a "Typical Sponge".
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"1. Pinacocytes: cells associated with the Pinacoderm (epidermal-like cells)
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Reproductive cells
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Fission; regeneration; Buds; Gemmules; production of Sperms &/or Eggs
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Sclerocytes (blasts)
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Produce & secrete spicules (internal support)
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Spongocytes (blasts)
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Produce & secrete spongin fibers (internal support)
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Collencytes (blasts)
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Produce & secrete fibrilar collagen (internal support) **
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Lophocytes (blasts)
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Produce & secrete fibrilar collagen, but in greater abundance **
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Asconoid
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Flagellated spongocoels: Represents the simplest type of water flow
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Syconoid
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Flagellated canals: Represent the next higher order organization;Prosopyle, which are tiny openings that channel water into radial canals;---> Choanocytes
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Leuconoid
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Flagellated chambers: Represents the most complex array of water ways of all of the sponges
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Types of Skeleton Components
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"• Proteinaceous (Mesohyl) : Composed of: Spongin; Spiculin; Fibrilar collagen; Filaments
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