animal 1 Flashcards
phylum: cnidarians
radial symmetry two cell layers ecto/endo tissue level of organization hermaphrodites gvc polyp/medusa
classes of cnidarians
hyrozoa: mostly polyp
Anthozoa: only polyps
Scyphozoa: mainly medusa
platy
bilateral symmetry
cephalon action
3 layers of cells
mesoderm
excretion and ingestion hard: branched gvc, flat, flame cells
Turbellaria
free living worms planarian
cross eyed
Trematoda
flukes: blood organs, parasitic
Cestoda
tapeworm parasitic head w suckers no gvc multiple hosts
life cycle of tapeworm
adult attaches in human mature proglottid fertilization gracias proglottid elimination egg in feed ingestion by cow 6hooked larva encysted by bladder worm eat raw meat
sponge
germ layers: 0 body cavity: central cavity (osculum) digestion: archeocyres engulf food particles lysosomes circulation: choanocytes: flagella reproduction: sexual excretion: out of osculum nervous system: protective skeletons
hydra
germ layers: 2
Body cavity; gvc
digestion: extra: gland cells intra: vacuoles and lysosomes
reproduction: polyp- asexual, medusa-sexual
excretion: diffuse, out through mouth
nervous system: sensory cells, nerve net in mesoglea,
planaria
germ layers:3 gvc digestion: extra/intra+pharynx reproduction: hermaphrodites, internal fertilization excretion: flame cells nervous system: ganglia, nerve cords
fluke lifecycle
egg in feces, miricidum in water, sporocyst in snail, redia in snail, cercaria, cercaria in fish-encysted, eat raw fish in humans
osculum pore spicule archeocyte choanocyte
water and food leaves
water and food enters
part of skeleton and is used in classification
make spicules and engulf food particles and circulate their nutrients
use flagella
animals
heterotrophs eukaryotic multicellular reproduce sexually respond to stimuli mobile vertebrates or invertebrates
trends in animal evolution
levels of organization: tissues, organs, systems
radial to bilateral symmetry
cephalization
body plan: sac plan to a tube