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
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Tongue Worm, Balanoglossus sp., stained midsaggital section.
See also labeled photo.
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Acorn Worm, probably Saccoglossus kowalevskii , preserved specimen (anterior portion only).
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Tongue Worm, Balanoglossus sp., preserved specimen (anterior portion only).
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Amphigraptus sp.,graptolite fossils; Ordovician, OK
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