Heart urchins sand dollars spine form 5 ambulacra

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Unformatted text preview: chins, heart urchins, sand dollars ( = spine form ) 5 ambulacra bottom part grows faster than the upper part. it still have 5 rows of tube feet aboral view 5 interambulacra Class Holothuroidea: sea cucumbers ( = sea cucumber form ) sea urchin walk on its side move the tube feet on the bottom (longitudinally) bilateral symmetry 5 ambulacral and interambulacral regions externally visible in some pharyngeal slits What are chordates? Sea squirts, lancelets, jawless fishes, jawed fishes, and tunicate tetrapods (amphibians, reptiles, mammals) Deuterostomes with… Notochord human: as an embryo, not in adult body (replace w/ vertebrate) Dorsal tubular nerve cord tubular spinal cord (hollowed middle) at least in embryo Post-anal tail Pharyngeal slits endostyle/thyroid mucus secreting gland over the gill slits a firm rod of tissue that lies underneath your spinal cord (human: regulate hormone) Chordate features Four synapomorphies dorsal hollow nerve endostyle/thyroid secrete mucus notochord post-anal tail pharyngeal slits Pharyngeal slits openings between the pharynx and the exterior associated with filter feeding or respiration Why are pharyngeal slits not considered a synapomorphy of chordates? a)! Bec...
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