BIO2231 Lecture Notes - Lecture 16: Acorn Worm, Pterobranchia, Hemichordate

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30 May 2018

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Phylum Hemichordata: Acorn worms

• Coelomate, deuterostome, bilateral

• Exclusively marine

• Sluggish, live in burrows

• Not chordates

• Solitary/colonial

• Sister clade to echinoderms

• Proboscis (mouth opens behind), collar, trunk

• Ciliary mucus feeders

• Pharyngeal slits; shared characteristic with chordates

• Stomatochord, not homologous to notochord in chordates, connects to coelom

• Class Enteropneusta

• Class Pterobranchia

Class Enteropneusta

-colonial

-sedentary, small

-tentacles used for feeding

-zooids independent or

connected

Dolichoglossus

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