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Zoology Exam 3 (Echinodermata (Echinoidea (sea urchins, sand dollars, sea…
Zoology Exam 3
Echinodermata
Echinoidea
sea urchins, sand dollars, sea biscuits
Asteroidea
sea stars
Ophiuroidea
brittle stars
Holothuroidea
sea cucumbers
Crinoidea
sea lillies and feather stars
"spiny skin", deuterostomes, not segmented, water vascular system for circulation, dermal endoskeleton composed of ossicles, no excretory organs, heart or brain, pentamerous radial symmetry, bilaterally symmetric bipinnaria larvae, tube feet
Arthropoda
Crustacea
mostly aquatic, 2 pairs of antennae, mandibles, 2 pairs of maxillae, some branched appendages, gills to breathe
Myriapoda
1-2 pairs of legs per segment, centipedes and millipedes, a pair of antennae, a pair of mandibles, two pairs of maxillae, unbranched appendeges
Hexopoda
Insects (75% of all animals), 3 tagmata, head, thorax, abdomen, a pair of antennae, a pair of mandibles, 2 pairs of maxillae, 3 pairs of legs on thorax, ubnbranched appendages
Chelicerata
two tagmata - cephalothorax and abdomen, no antennae, chelicerae (pincers or fangs), hunters, mostly land dwelling
Ecdysozoa- must shed to grow, protostomes, have coelom,cuticle
Chordata
urochordates
tunicates and sea squirts, most adults are sessile, ave tunic covering, pharyngeal baskets for respiration and eating
cephalochordates
lancelets, very small, notochord is used for burrowing, marine sand dwellers,
vertebrates
Clades
craniata
have skull, two clusters of Hox genes
gnathostomes
jaws
tetrapods
4 feet
closed circulatory system