Zoology
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Eukaryotic Characteristics
Gastrulation in Animals
Symmetry in Animals
Protostomes and Deuterostomes
Invertebrates and Vertebrates
Phylum Porifera
Class Calcarea
Class Hexactinellida
Class Demospongia
Class Scyphozoa
Class Homoscleromorpha
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Phylum Cnidaria
Class Hydrozoa
Class Anthozoa
Class Cubozoa
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Phylum Platyhelminthes
Class Turbellaria
Class Trematoda
Class Cestoda
Class Monogenea
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Phylum Nematoda
Class Adenophorea
Class Secernentea
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Phylum Mollusca
Class Bivalvia
Class Polyplacophora
Class Gastropoda
Class Cephalopoda
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Phylum Annelida
Class Aelosomata
Class Polychaeta
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Phylum Arthropoda
Class Merostomata
Class Arachnida
Class Pycnogonida
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Phylum Echinodermata
Class Asteroidea
Class Ophiuroidea
Class Echinoidea
Class Crinoidea
Class Holothuroidea
Class Asteroidea
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Phylum Agnatha
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Phylum Chondrichthyes
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Phylum Osteichthyes
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Phylum Amphibia
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Phylum Reptilia
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Phylum Aves
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Phylum Mammalia
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Works Cited
Class Demospongia
Type of Cells:
Single nucleus,
single external membrane
Spicules:
Silica
Spongin Fibers:
In many species
Massive Exoskeleton:
In some species:
Made of
aragonite
if present
Body Form:
Leuconoid (21).