Bio 1114 - Exam 3 ANIMALS

animals do not have

cell walls. they are heterotrophs.

types of feeding

suspension, bulk, liquid

movement

mostly motile, some sessel.

reproduction

• diploid

• sperm and egg fuse to make an oogamete

classification

• derived from the opistikonta (posterior flagella)

asymmetry

sponge

radial symmetry

hydra…muliple planes

bilateral symmetry

crayfish…only one plane

specific features of development

• zygote —> blastula —> gastrulation —> gastrula

triploblastic

ectoderm, endoderm, and mesoderm

protostomes

• spiral cleavage

• determinate cleavage

• blastospore becomes mouth

deuterostomes

• radial cleavage

• indeterminate cleavage

• blastospore becomes anus

three body cavity

acoelomate, psedocoelomate, coelomate

acoelomate

flat worms…no body cavity.

pseduocoelomate

has muscles but not along the full animal/digestive tract

coelomate

has body cavity and muscles to move food throughout

segmentation

annelida, arthropoda, chordata

annelida

each ring is a segment

arthropoda

developed specialized appendages on many segments

Chordata

muscles and backbones

ctenophores

not the most basal

phylum porifera body plan

• first mulicellular animals

• no movement, sessile

• water movement in through the ostium

freshwater sponges

• water enters into ostium

• encrusting

• produce gamules during winter

porifera classification

base on skeletons. many are made of glass to handle the pressure