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The Parazoa The Radiata The Acoelomates The Pseudocoelomates The Coelomates: Protostomes The Coelomates: Deuterostomes. 1,000,000+ species of animals 95% are invertebrates Most are aquatic. Invertebrates. The Parazoa. Sponges Sessile Lack muscles and nerves Suspension-feeders.

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invertebrates
The Parazoa

The Radiata

The Acoelomates

The Pseudocoelomates

The Coelomates: Protostomes

The Coelomates: Deuterostomes

1,000,000+ species of animals

95% are invertebrates

Most are aquatic

Invertebrates
the parazoa
The Parazoa
  • Sponges
  • Sessile
  • Lack muscles and nerves
  • Suspension-feeders
the radiata
Cnidaria

Corals, hydras, jellyfis

Radial symmetry

Diploblastic

Gastrovascular cavity

Cnidocytes

Nerve net

Ctenophora

Comb jellies

100 species, all marine

The Radiata
the acoelomates
The Acoelomates
  • Bilateral symmetry
  • Moderate cephalization
  • Triploblastic
  • Organs, organ systems and muscle
  • Still lack a body cavity (coelom)
  • Flatworms
  • Examples: planaria, liver flukes, tapeworms
the pseudocoelomates
The Pseudocoelomates
  • Includes the phyla Rotifera and Nematoda
  • Complete digestive system
  • Fluid filled body cavity, acts as a hydrostatic skeleton
coelomates
Coelomates
  • Two major lines: Protostomes and Deuterostomes
  • Probably evolved to fill different ecological niches
  • Differ in cleavage patterns and fate of the blastopore
the protostomes
The Protostomes
  • “mouth first”
  • Includes a number of phyla: nemertae, bryozoans, brachiopods, mollusks, annelids, and arthropods
  • Characterized by determinate cleavage
  • Formation of a mouth from the blastopore
  • Spiral cleavage
the deuterostomes
The Deuterostomes
  • “mouth second”
  • Spiral cleavage
  • Blastopore forms the anus
  • Includes echinoderms and chordates
  • Indeterminate cleavage