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Protochordates

Discover the fascinating world of protochordates, a group of organisms within the Chordata phylum that exhibit dorsal hollow nerve cord, notochord, bilateral symmetry, pharyngeal gill slits, and more. Hemichordata, including acorn worms and colonial tube creatures, show connections to other deuterostomes and share chordate features. Urochordata (tunicates) and Cephalochordata play vital roles within this diverse classification, with larval stages resembling those of echinoderms.

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Protochordates

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  1. Protochordates

  2. Chordates Attributes • Dorsal hollow nerve cord • Notochord • Bilateral symmetry • Pharyngeal gill slits • Post-anal tail • Ventral circulatory system

  3. Hemichordata • Acorn worm--marine substrate dwelling individuals • Colonial tube creatures with tentacular crowns • Connections to the other deuterostomes • Have some chordate features • Larval stage is the dipleurula larval stage which is very similar to the bipinnaria larval stage of the echinoderm

  4. Chordata • Urochordata--tunicates • Cephalachordata

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