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Hemichordates, as represented by the classes Enteropneusta a n d Evolution of the chordate body plan: New insights from a hemichordate molecular. ported the traditional view of a monophyletic Hemichordata, Echinodermata, Ambulacraria, and phylogenetic relationship of hemichordates to echinoderms.Phylum Hemichordata. (acorn worms & graptolites). 85 species worm-like deuterostomes hemichordates share characteristics with both echinoderms and PDF | Hemichordata is a group of exclusively marine animals, consisting of two subgroups, the sessile and small colonial pterobranchs and the solitary, | Find PDF | Phylum Hemichordata, composed of worm-like Enteropneusta and colonial Pterobranchia, has been reported to only contain about 100 species. However, Oct 4, 2016 - Hemichordates are solitary or colonial, vermiform, bilateral symmetrical, triploblastic, exclusively marine forms with three body parts: fleshy proboscis, collar and Summary. Hemichordates are a deuterostome phylum, the sister group to echinoderms, and closely related to chordates. They have thus been used to gain Jun 17, 2005 - Hemichordates and. 15. Chordates. Eucoelomata in which:- 1. The body may be metamerically segmented or regionally differentiated. 2. A head is usually