Zoology Midterm Review

Spherical Symmetry

Spherical Symmetry

any plane passing through the center divides the body into mirrored halves (some protozoans)

Radial Symmetry

where an animal can be divided into similar halves by more than 2 planes

Bilateral Symmetry

where only a sagittal plane can divide the animal into two mirrored halves

Asymmetric

no line exists to divide the organism into parts

Acolemate

without body cavity

Pseudocoelomate

body cavity surrounding the gut without the mesoderm (diploblastic)

Eucoelomate

has a true coelem which surrounds the gut, lined on both sides by mesoderm (tripoblastic)

Flatworm scientific name

Platyhelminthes

Roundworm scientific name

Nematoda

Segmented worms scientific name

Annelida

Clam Phylum

Mollusca

Clam Class

Bivalvia

Starfish Phylum

Echinodermata

Starfish Class

Asteroidea

Crayfish Phylum

Arthropoda

Crayfish Class

Malacostraca

Grasshopper Phylum

Arthropoda

Grasshopper Class

Arthropoda

Shark Phylum

Chordata

Shark Class

Chondrichthyes

Rat Phylum

Chordata

Rat Class

Phylum