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24 Cards in this Set

  • Front
  • Back

General characteristics of animals

Multicellular


Hetero trophy


Internal digestion


Motility

Common ancestor

Colonial flaggelated protist

Formation of colonies occurred because...

Colonies are more efficient at prey capture

Diploblastic

Animals have two cell layers ectoderm and endoderm

Triploblastic

Animals have three cell layers ectoderm endoderm and mesoderm

Gastrulation

Embryo is a hollow ball of cells that indent to form a cavity called the blastopore

Protostomes blastospore...

Blastopore develops into the mouth

Deuterostomes blastopore...

Blastopore develops into the anus and the mouth develops later

Cephalization

Concentration of sensory organs and nerve tissues at anterior, the head

Acoelomate

Does not have fluid filled body cavity

Pseudocoelomate

Body cavity is a fluid-filled space where internal organs are suspended

Coelomate

Body cavity is a coelom that develops in the mesoderm

Peritoneum

Lines the coelom surrounds the internal organs

Hydrostatic

When muscles contract fluid is pushed to another part of the cavity like snails

Segmentation

Facilitates specialization of body regions and controls movements precisely

Bilateria

Monophyletic group that includes protostomes and deuterostomes

Animals in the eumetazoan have...

Body symmetry,


a gut and nervous system,


and tissues organized into distinct organs

Cnetophores

Diploblastic with an extracellular matrix called mesoglea between the two layers,


Complete gut

Placozoans

a symmetrical and diploblastic

Cnidarians

Gastrovascular cavity functions as a hydrostatic skeleton


Radial symmetry


Ex: jellyfishes

Three clades of the cnidarians

Anthozoans (corals)


Scyphozoans (jellyfish)


Hydrozoans (hydras)

3 groups of Diploblastic animals

Cnetophores


Placozoans


Cnidarians

Protostomes are classified by 3 groups...

Arrow worms


Lophotrochozoans


Ecdysozoans

Deuterostomes are split into 3 groups...

Echinoderms, hemichordates, chordates