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Biology lab
Unit 4 Lab 16
Question | Answer |
---|---|
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 |