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Zoology
WCHS Zoology Chapter 17
Word | Definition |
---|---|
tornaria | the ciliated larval stage of an acorn worm; class Enteropneusta, phylum Hemichordata |
notochord | a rodlike, supportive structure that runs along the dorsal midline of all larval chordates and many adult chordates |
pharyngeal slits | one of several openings in the pharyngeal region of chordates, they allow water to pass from the pharynx to the outside of the body; in the process, water passes over gills or suspended food is removed in a filter-feeding mechanism |
tubular nerve cord | a hollow nerve cord that runs middorsally along the back of chordates, one of four unique chordated characteristics; also called the neural tube, and in vertebrates, the spinal cord |
postanal tail | a tail that extends posterior to the anus, one of the four unique characteristics of chordates |
endostyle | a ciliated tract within the pharynx of some chordates that is used in forming mucus for filter feeding |