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9 Cards in this Set

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Review the following major features of animal phylogeny (where on the phylogeny do they occur):
bilateral symmetry
single plane of symmetry, associated with cephalization
Review the following major features of animal phylogeny (where on the phylogeny do they occur):
diploblastic
animal whose body develops from 2 basic cell layers: ectoderm & endoderm; includes cnidarians & ctenophores
Review the following major features of animal phylogeny (where on the phylogeny do they occur):
triploblastic
animal whose body devlops from 3 basic embryonic cell layers: ectoderm, mesoderm, adn endoderm. All animals except sponges, cnidarians, adn ctenophores belong
Review the following major features of animal phylogeny (where on the phylogeny do they occur):
deuterstome
triploblastic, includes coelomates only, radial cleavage-cells divide parallel to main axis, interminate devlopment, blastopore-anus dev. 1st
Review the following major features of animal phylogeny (where on the phylogeny do they occur):
protostome
triploblastic, inlcudes acoelomates, pseudocoelomates, and coelomates, spiral cleavage-cells orient @ angles to main axis, determine dev.-cells have a predeterminate fate, blastopore (mouth first)
Review the following major features of animal phylogeny (where on the phylogeny do they occur):
growth by molting
Used by ecdysozoans, that involves the shedding of an external protective cuticle or skeleton, expansion of the soft body, adn growth of a new external layer.
Review the following major features of animal phylogeny (where on the phylogeny do they occur):
coelom types
internal, usually fluid-filled, body cavity that forms within the mesoderm
What are the major developmental features that define a protostome animal?
distinguished by their embryonic development; first opening becomes the anus.
Schizocoelomates, (solid mass of the embryonic mesoderm split to form a coelom)
What are the major developmental features that define a deuterstome animal?
zygote first develops into a hollow ball of cells (bastula) Early divisions occur parallel to polar axis. Mesoderm forms as evaginations of the devloped gut that pinch off, forming coelom.