Balanoglossus

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Balanoglossus
Enteropneusta.png
Scientific classification e
Kingdom: Animalia
Phylum: Hemichordata
Class: Enteropneusta
Order: Enteropneusta (order)
Family: Ptychoderidae
Genus: Balanoglossus
Delle Chiaje, 1829
Species

See text.

Balanoglossus is an ocean-dwelling acorn worm (Enteropneusta) 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 (1/10 in) or as large as 5 mm (1/5 in).

Species[edit]

The World Register of Marine Species lists the following species: [1]

References[edit]

  1. ^ Balanoglossus - delle Chiaje, 1829 World Register of Marine Species. Retrieved 2011-10-17.

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