Term
| animals are ____ ____ that lack.....? What hold their body together? What are unique characteristics of animals? |
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Definition
multicellular eukaryotes
cell wall
structural protein (collagen)
nervous & muscle tissue |
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Term
| cleavage / blastula / gastrulation / gastrula |
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Definition
-zygote undergoes cell division
-cleavage leads to formation of multicellular blastula
-which undergoes gastrulation forming a gastrula w/ different tissue layers |
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Term
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Definition
| sexually immature & morphologically distinct from adult undergoes metamorphosis |
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Term
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Definition
hypotheses regarding decline of Ediacaran biota:
- new predator prey relationships
-rise in atmospheric oxygen |
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Term
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Definition
-coral reefs emerged
-dinosaurs
-first mammals emerged |
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Term
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Definition
-followed mass extinctions of large non flying dinosaurs & marine reptiles
-mammals increased
climate cooled |
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Term
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Definition
| set of morphological & developmental traits used to categorize animals |
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Term
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Definition
no front, back, or left & right
sessile or platonic |
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Term
| bilateral symmetry / what does it consist of? |
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Definition
- 2 sided symmetry often have central nervous system
- dorsal & ventral (top & bottom)
-left & right side
-anterior & posterior (head & tail ends)
-cephaliztion (development of a head) |
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Term
| tissues / what are the three germ layers? |
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Definition
-collections of specialized cells separated from other tissues by membraneous layers
-ectoderm / endoderm/ mesoderm |
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Term
| ectoderm / endoderm / mesoderm |
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Definition
-germ layer covering embryos surface
-innermost layer, lines digestive tube (archenteron)
-intervening layer |
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Term
| dipoblastic (ex) / triploblastic (ex) |
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Definition
-ectoderm & endoderm (cnidarians & comb jellies)
- ectoderm, endoderm & mesoderm (bilaterians) possess body cavity |
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Term
| coelomates / coelom & pseudocoelomates / pseudocoelom & acoelomates |
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Definition
tripoblastic animals that possess a true coelom (body cavity derived from coelom)
tripoblastic animals that possess pseudocoelom (body cavity derived from mesoderm & endoderm)
no body cavity |
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Term
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Definition
| cleavage is spiral & determinant |
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Term
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Definition
cleavage is radial & indeterminant
makes identical twins possible & stem cells: |
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Term
| coelom formation? protosome& deurtosome development |
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Definition
-splitting of solid masses of mesoderm forms coelom
-each cell retains capacity to develop into complete embryo
mesoderm buds from cell wall of archenteron to form coelom |
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Term
| blastopore - protosome& deurtosome development |
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Definition
-balstopore becomes mouth
-blastopore becomes anus |
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Term
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Definition
- animals share common ancestor
- sponges are basal animals
- eumetazoa is a animals clade w/ true tissues
-most animals are bilaterians
- chordates & some other phyla belong to deuterostomia clade |
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Term
| how do molecular studies categorize animals? (what 3 clades?) |
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Definition
| deurostomia , ecdysozoa, lophotrochozoa |
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Term
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Definition
| shed exoskeletons through ecdysis |
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Term
| lophotrochozoans (lophophore & trocophore larva) |
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Definition
| have a feeding structure called lophophore others go through distinct developmental stage called trocophore larva |
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