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24 Cards in this Set

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Trait
genetically determined characteristic or condition
Mutation
change/departure from parent type in one or more hertable characteristics
most recent common ancestor
the most recent hereditary ancestor the species share
Phylogeny tree
shows the development of different speicies in relation to others, starts at ancestral protist w/ multicellularity

-first split is no true tissues vs. true tissues, and next radial vs. bilatteral symmetry
Parazoa
sponges ONLY - body form is so different from all other species
Eumetazoa
all other animals
Phylum Porifera
sponges, porifera meaning 'pore-bearing'
3 classes of Phylum Porifera
Demospongae (bath), Ccalcara (calcified), Hexactinella (glass)
osculum
sponge opening
spicules
needle-like objects, surrounding osculum.

-provide suppore and protection for body and prevent small animals from entering central cavity
Central cavity
serves as a channel for water which enters through the pores
Spongin
supportive material consisting of soft substance
incurrent pores & canals
allows for passage of water into spongocoel; canals open into choanocyte chambers
choanocytes / collar cells
line central cavity and channels leading into it, attached flagellas move water through the body.
Cnidaria
coral, jellies, sea anemones, porteguese man-of-wars
Classes of Cnidaria
Anthozoa (corals&anemones), Cubozoa (box jellies), Hydrozoa (P. m.o.w and hydra), Scyphozoa (true jellies)
polyp
sessile form - stuck on something using basal disc
medusa
motile form, floats around
mouth
the only opening to the digestive system and serves as both mouth and anus
tentacles
contain nematocysts and contract to provide slight movement through waters
basal disc
point of attachment to substrate
mesoglea
non-cellular gelatious material between inner and otter body walls (between epidermis and gastrodermis)
cnidocytes
stinging cells containt the nematocysts - used as defense mechanism or to secure prey
nematocysts
organelles inside cnidocytes holding capsules w/ coiled thread - whos barbs inject toxin into preys