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animal diversity intro bio 2
Characteristics of Animals
eukaryotic |
multicellular |
lack cell wall |
heterotrophic |
mostly sex reprod |
diverse & complex developmental strats |
- gastrulation, symmetry, germ tissue |
animal body plans: tissues
ectoderm |
outermost covers embryos surface |
endoderm |
innermost, digestive tube |
mesoderm |
middle, connective tissues |
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animal phylogeny- 'body plans'
combine morphological, molecular, fossil data |
~ 35 animal phyla |
body plan |
set of morphological and developmental traits |
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symmetry, tissues, body cavaties |
animal body plans: body cavities
coelomate |
true coelom |
pseudocoelomate |
"fake" coelom |
acoelomate |
no coelom |
General points of agreement
animals share a common ancestor |
sponges are basal animals |
eumetazoa clade with true tissues |
most animals are bilaterians |
- 3 clades |
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animal body plans: gastrulation
cleavage |
rapid cell division in zygotes |
blastula |
embryonic stage of multicellular hollow ball from cleavage |
gastrula |
embryonic stage of dif. tissue layers created thru gastrulation |
blastopore: |
opening on embryo.. usually becomes anus |
protostomy vs deuterostomy
PROTOSTOMY |
DEUTEROSTOMY |
mouth first |
anus first |
sprial determinate |
radial inderterminate |
molluscs |
chordates |
bottom 8 |
middle 3 |
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