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Biology lab

Unit 4 Lab 16

echinoderms slow-moving or sessile marine animals that include sea stars and sea urchins
deuterostomes share developmental characteristics radial cleavage, formation of the anus from the blastopore
water vascular system a network of hydraulic canals branching into tube feet that function in locomotion and feeding
Asteroidea sea stars and sea daisies
Ophiuroidea brittle stars
Echinoidea sea urchins and sand dollars
Crinoidea sea lilies and feather stars
Holothuroidea sea cucumbers
Notochord present in all embryos, and may be present or absent/reduced in adults.
Dorsal tubular nerve cord forms by an infolding of the ectoderm tissue, which then pinches off and becomes surrounded by mesoderm.
Pharyngeal gill slits in fish, these have become modified as gills, and in humans as our ears and eustachian tubes
Postanal tail is present and extends behind the anus in many taxa, thus the anus isn’t at posterior tip of body. In humans, the tail is present during embryonic development, but is subsequently resorbed
Lancelets named for their bladelike shape
Agnatha fish lacking jaws
Chondrichthyes cartilaginous fish
Osteichthyes bony fish
Amphibia amphibians
Reptilia reptilia
Aves birds
Mammalia mammals
Created by: danat214



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