Evolutionary Aspects of Animal kingdom Flashcards
what is monophyletic origin
animal kingdom in monophyletic, all taxa evolved from a single common ancestor
how are clades grouped
into monophyletic groups
General organization of the animal tree
all animals belong to kingdom Animalia, then into subgroups
5 characteristics of animals
1.Multicellular organisms
2.Heterotrophic (cannot produce own food through photosynthesis)
3.Eukaryotic (defined nucleus and membrane bound organelles)
4.Capable of movement
5. Diploid dominant life cycle
Why are cleavage patterns important
to distinguish animal lineages
What cleavage do protostomes have
spiral cleavage- newly produced cells lie between cells and below them
What cleavage do deuterostomes have
radial cleavage- newly produced cells lie above and below cells
Ectoderm
skin and nervous system
Mesoderm
muscle and skeleton
Endoderm
digestive tract
What do germ layers develop into
tissues and organs in mature animals
Diploblastic vs Triploblastic
Diploblastic have 2 germ layers-ecto and endo
Triploblastic have all 3
Facts of Protostomes
spiral cleavage, determinate cleavage, mouth develops from blastopore, mesoderm differentiates near blastopore, has schizocoelom (split in mesoderm)
Facts of Deuterostomes
radial cleavage, indeterminate cleavage, mouth develops from secondary opening, mesoderm orginates from outpocketings of archenteron (primitive gut) entercoelom (coelom develops from space within outpocketings)
How does coelom formation develop
from space within the outpocketings in deuterostomes
