Deuterostomes- Lecture 8

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14 Terms

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synapomorphies

  • coelom formed by enterocoely

  • pharyngeal gill slits

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enterocoely

the process of coelom formation in deuterostome embryos, where mesoderm pouches bud off from the developing gut (archenteron) and fuse to form the coelom

<p><span>the process of coelom formation in deuterostome embryos, where mesoderm pouches bud off from the developing gut (archenteron) and fuse to form the coelom</span></p>
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pharyngeal gill slits

openings in the pharynx (throat)

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other deuterostome features

  • radial cleavage

  • well-developed coeloms

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deuterostomous embryos

anus forms before mouth

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Plesiomorphy

inherited from a common ancestor but is not unique to a specific group within a larger clade

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two sister clades in deuterostomia

ambulacraria and chordata

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ambulacraria

Shared features include gene sequences and developmental traits

  • clade of invertebrate phyla that includes echinoderms and hemichordates

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hemichordates

phylum within ambulacraria

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hemichordate synapomorphies

  • body has proboscis, collar and trunk

  • stomochord (dorsal extension of the pharynx)

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tricoelomate body plan

  • protocoelom

  • mesocoelom

  • metacoelom

<ul><li><p>protocoelom</p></li><li><p>mesocoelom</p></li><li><p>metacoelom</p></li></ul><p></p>
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clades of hemichordata

  • enteropneusta (acorn worms)

  • pterobranchia

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enteropneusta

acorn worms

  • hydrostatic skeleton

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