LSC 385 — Invertebrate Zoology
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Invertebrate Diversity
Hemichordates

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Phylum Hemichordata — Acorn Worms

Characteristics

  • Bilaterally symmetric, worm-like Deuterostomes
  • 3 Body regions: proboscis, collar, trunk
  • Extension of pharynx forms buccal diverticulum
  • Pharyngeal gill slits and pores
Tongue Worm specimen
Tongue Worm, Balanoglossus sp., preserved specimen (anterior portion only). 		Tongue Worm
Tongue Worm, Balanoglossus sp., stained midsaggital section.
See also labeled photo.

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Protozoans

Porifera

Cnidarians

Ctenophores

Platyhelminthes

Nemerteans

Nematodes

Minor Phyla

Lophophorates

Annelids & relatives

Molluscs

Tardigrades &
Onychophorans

Arthropods

Echinoderms

Hemichordates

Invertebrate Chordates


This page last updated 31 March 2007 by Udo M. Savalli ()
Images and text © Udo M. Savalli. All rights reserved.