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Intro to Animals
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What gives rise to tissues and organs?
the embryonic/germ layers
What is Diploblastic?
have 2 germ layers (ectoderm and endoderm)
includes cnidarians (jelly fish and anemone) and comb jellies
What is Triploblastic?
have 3 germ layers (ecto, endo and mesoderm)
includes
: flatworms, arthropods (have an exoskleteton), vertebrates and others
What is a coelem?
a true body cavity (derived from mesoderm)
fluid or air filled space
internal organs are suspended in
What is a pseudocoelom?
body cavity derived from meso and endoderm
What are triploblastic animals with a body cavity called?
Pseudocoelomate
What are triplosblastic animals lacking a body cavity called?
acelomates
What are the two main types of cell development?
Protostome and deuterostome
What is protostome development?
spiral (cells are not parallel)
have a determinate cleavage
fate of cell is determined early
What is deutrostome development?
Radial (form parallel/perpendicularly)
indeterminate cleavage
each cell can complete an embryo (can from identical twins)
What characteristics do the old and new tree agree on?
Animalia
: monophyletic
All animals share the common ancestor colonial flagellate
sponges are basal animals
Eutetazoa is a clade with true tissues
most animal phyla belong to the clade Bilateria
chordates belong to the clade Deuterostomia
What characteristics do the old and new tree disagree on?
old: divides bilaterian into the clades deuterostomes and protostomes
New uses three clades: deuterostomia, ecdysozoa and Lophotrochozoa
What are the old and new trees based on?
old= morphology
new= molecular evidence
What did the common ancestor of animals resemble?
choanoflagellates
Characteristics of Choanoflagellata
Heterotrophic protist
single flagellum surrounded by collar of microvilli
fingerlike projections of cell membrane
similar cell morphology to sponges
What appeared in the Cambrian period?
complex life, including those with skeletons appeared (most major phyla appeared)
535-525 mya
during Paleozoic era (542-251 mya)
Mesozoic Era
251-65.5 mya
first mammals emerged
dinosaurs were dominant terrestrial vertebrates
coral reefs emerged
plants and insects became more diverse
Cenzoic Era
65.5 mya-present
began with mass extinction of animals
mammals became dominant
global cooling
Author
schoenbe
ID
265459
Card Set
Intro to Animals
Description
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Updated
3/19/2014, 12:28:59 AM
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