BIO 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
Tongue Worm, Balanoglossus sp., stained midsaggital section.
See also labeled photo.
Tongue Worm
A Tongue Worm, possibly also Balanoglossus sp., stained midsaggital section.
See also labeled photo.
Tongue Worm specimen
Acorn Worm, probably Saccoglossus kowalevskii , preserved specimen (anterior portion only).
Tongue Worm specimen
Tongue Worm, Balanoglossus sp., preserved specimen (anterior portion only).
Graptolite
Dictyonema sp. graptolite fossil; Ordovician, Morocco. This colonial species was anchored to sediments at its narrow end.
Graptolites
Amphigraptus sp.,graptolite fossils; Ordovician, OK
This page last updated 21 July 2017 by Udo M. Savalli ()
Images and text Udo M. Savalli. All rights reserved.