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  • Balanoglossus is an ocean-dwelling acorn worm genus of great zoological interest because, being a Hemichordate, it is an "evolutionary link" between invertebrates and vertebrates. Balanoglossus is a deuterostome, and resembles the Ascidians or sea squirts, in that it possesses branchial openings, or "gill slits", but differs in having no notochord and no nerve cord. It does have a stomochord, however, which is gut chord within the collar. Their heads may be as small as 2.5 mm or as large as 5 mm. Wikipedia

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