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Phylum Hemichordata. Zoology- Mrs. Adams. “Half Vertebrate”. Hemichordates display some characteristics of invertebrates and vertebrates Coelomates Deuterostomes Have dorsal and ventral nerve cord, gill slits, postanal tail, NO NOTOCHORD.

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phylum hemichordata
Phylum Hemichordata

Zoology- Mrs. Adams

half vertebrate
“Half Vertebrate”
  • Hemichordates display some characteristics of invertebrates and vertebrates
  • Coelomates
  • Deuterostomes
  • Have dorsal and ventral nerve cord, gill slits, postanal tail, NO NOTOCHORD
protostomes vs deuterostomes
Protostomes vs. Deuterostomes
  • Zygote cleaves to become blastula and then forms gastrula. The blastopore of the gastrula can become either the mouth or the anus of the organism
  • Protostome- Blastopore becomes the mouth. Ex-Annelids, Mollusks and arthropods
  • Deuterostome- Blastopore becomes anus. Ex-echinoderms, hemichordates,chordates
embryonic development
Embryonic Development
  • Protostome
    • Blastopore becomes mouth
  • Deuterostome
    • Blastopore becomes anus
phylum hemichordata1
Phylum Hemichordata
  • Three body regions
    • Proboscis
    • Collar
    • Trunk
  • Deuterostome
  • Gill slits
  • Open circulatory system
  • Dorsal and ventral nerve cord
  • Ex. acorn worms
lifestyle
Lifestyle
  • coastal and deep ocean
  • benthic (live in sand)
  • Rarely seen by humans
  • Size ranges – a few millimeters to 1.5 meters
  • Use proboscis to decompose organic material in sand
  • Release feces(poop) in coils
  • Separate sexes release gametes