overview of the metazoa Flashcards
what are the features that define anamalia life
eukaryotic
multicellular
motile
heterotrophic
sexual
embryonic
what are the levels of the linnean system of classification
kingdom
phylum
class
order
family
genus
species
what is a phylum
what is it based on
major group of animals though to share a common ancestor
based on body plan, embryonic stage, morphology
based on molecular evidence
which two parts of the linnean system are used to create latin binomials
genus and species
how many animal phyla are there
~35
when did modern phyla appear in the fossil reccord
during the Cambrian era
what is convergence
when two unrelated animals develop similar structures such as eyes
what and when is/was the cambrian explosion
about 540 mya
explosion of diversity
well preserved in burgess shale
what is the Burgess shale
well preserved area with many fossils from Cambrian era
what are an issue with the tree of life
oversimplification, many dead branches
what are three categories of animal based on body symmetry, grade and structure
sponges and Porifera: asymetrical, cellular-grade tissue with no real differentiation, unique body structure
cniderians: radial body plan, tissue grade but no real organs, two layer body plan
bilateria: basically bilateral, organ grade tissue, three layers of body(epi, meso endoderm)
what are the catagories of body organisation in bilaterians
aceolomate: flatworms, connected layers, central digestive cavity
psuedoceolomate: roundworms, gap between meso and endoderm called psuedoceolom
true ceolomate: keeps gap in mesoderm, plus hole under endo, contains all the cool groups
what are some features that separate protosomes and deuterosomes
protosomes have spiral cleavage
deuterosomes have radial
