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.
Balanoglossus
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Balanoglossus is a genus of ocean-dwelling acorn worms. It has zoological importance because, being hemichordates, they are an "evolutionary link" between invertebrates and vertebrates. Balanoglossus
