Annelida
What is the defining characteristic of Oligochaetes?
Clitellum
What is a defining characteristic of this phylum?
exoskeleton
What is the defining characteristic of this phylum?
soft body
Why do Polychaetes excrete ammonia?
Because they are able to dilute ammonia in their aquatic habitats
What traits do Polychaetes have that Oligochaetes do not have?
Parapodia
Those in the Chelicerata subphylum have this anatomical feature
Chelicerae
Physical feature that is adapted for each class
foot
octopus and worm share this circulatory system
closed circulatory system
How to physically distinguish Oligochaetes from Hirundinda
permanent clitellum
Arachnida
cells of skin that contain pigment in cephalopods
chromatophores
What does a snail, worm, and planaria have in common?
trochophore larval stage
3 differences between millipedes and centipedes
Centipedes - carnivorous, segments have a pair of jointed legs, fast
Millipedes - herbivores, slow, segments have two pairs of legs
Oldest part of the bivalve
umbo
Why does an open circulatory system affect the mobility?
Oxygen does not reach the tissues as efficiently as a closed circulatory system resulting in slower animals (exception arthropods)
The oldest and smallest whorl in gastropod shells
apex
Fan coral is part of which phylum
Cnidaria