Hemichordate
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Hemichordata is a phylum which consists of triploblastic, eucoelomate, and bilaterally symmetrical marine deuterostome animals, generally considered the sister group of the echinoderms. They appear in
Enteropneusta USNM 1431735, MBIO32531, BMOO 08254 Specimen Image
Cephalodiscus nigrescens
Schematic of embryonic cleavage and development in P. flava and S. kowalevskii
Amplexograptus, a graptolite hemichordate, from the Ordovician near Caney Springs, Tennessee.
Acorn worm
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The acorn worms or Enteropneusta are a hemichordate class of invertebrates. The closest non-hemichordate relatives of the Enteropneusta are the echinoderms. There are 111 known species of acorn worm i
Hemichordate
…deuterostome animals, generally considered the sister group of the echinoderms. They appear in the Lower or Middle Cambrian and include two main classes: Enteropneusta (acorn worms), and Pterobranchia. A third class, Planctosphaeroidea, is known only from the larva of a single species, Planctosphaera pelagica. The…
Acorn worm on the ocean floor
Acorn worm life cycle by M. Singh