Animal Diversity

What is the order of groupings by which animals are classified?

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

What is the most diverse phylum in the animal kingdom?

Arthropoda

Bilateral symmetry is directly associated with what specific evolutionary novelty in animals?

Head

What tissue layer is missing from diploblastic animals?

Mesoderm

protostome

mouth develops from blastopore

deuterostome

anus develops from blastopore

acoleomate

no body cavity, incomplete gut

pseudocoelmate

body cavity partially lined with mesoderm, complete gut

coelomate

body cavity completely lined with mesoderm, complete gut

diploblastic

two germ layers (they have the ectoderm and endoderm)

triploblastic

three germ layers (they have the ectoderm, endoderm, and mesoderm)

Poerifera

asymmetrical

no blastopore

no coelomate

no germ laers

no skelton

no true tissues

EX SEA SPONGE

Cnidaria

radial symmetry

no blastopore

no coelomate

diploblastic

no skelton

has true tissues

EX CORAL

Platyhelminthes

bilateral symmetry

protostome

acoelomate

triploblastic

no skeleton

has true tissues

EX ASCANS WORMS

Mollusca

bilateral symmetry

protostome

coelomate

triploblastic

no skeleton

has true tissues

EX CLAM

Annelida

bilateral symmetry

protostome

coelomate

triploblastic

no skeleton

has true tissues

EX LEECH

Nematoda

bilateral symmetry

protostome

pseudocoelomate

triploblastic

exoskeleton

has true tissues

EX ROUND WORM

Arthropoda

bilateral symmetry

protostome

coelomate

triploblastic

exoskeleton

has true tissues

EX BUTTERFLY

Echinodermata

bilateral symmetry

deutrostome

coelomate

triploblastic

endoskeleton

has true tissues

EX SEA URCHIN OR STAR FISH

Chordata

bilateral symmetry

deutrostome

coelomate

triploblastic

endoskeleton

has true tissues

EX SEA HORSE

Annelida unique characteristics

segmented, they can't hear, nocturnal

Chordata unique characteristics

a notochord, post-anal tail, seashores mate for life

Nematoda unique characteristics

parasitic

Arthropoda unique characteristics

none have large body sizes

Echinodermata unique characteristics

some have up to 40 arms

Cnidaria unique characteristics

have choanocyte for defense and gathering food

What is an ecological niche?

the role and position a species has in its environment; how it meets its needs for food and shelter, how it survives, and how it reproduces