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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A Tongue Worm, possibly Saccoglossus 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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A fossil acorn worm, Mazoglossus ramdelli; proboscis is at right; Pennsylvanian Epoch, Illinois.
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Phyllograptus sp. (upper right) & Didymograptus sp. (lower left) graptolite fossils; Ordovician, UT
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Dictyonema sp. graptolite fossil; Ordovician, Morocco. This colonial species was anchored to sediments at its narrow end.
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Amphigraptus sp.,graptolite fossils; Ordovician, OK
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Didymograptus murchisoni graptolite fossils; Ordovician, UK
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