Phylum Hemichordata (Peanut Worms)
Approximate Number of Species: 85
Largest: The largest colony is Cephalodiscus densus with a length of 8.2 feet (2.5 meters) and the noncolonial species is Balanoglossus gigas with a length of 9.8 inches (250 mm)
Smallest: The smallest colony is the species Rhabdopleura compacta at 0.11 inches in diameter (2.9 mm ) and the smallest noncolonial species is Saccoglossus pygmaeus with a length of 0.12 inches (3 mm)
Brusca RC & Brusca GJ (2003) Invertebrates (Sinauer Associates, Inc., Publishers, Sunderland, MA) 2nd Ed.
Lambert G (2005) Ecology and natural history of the protochordates. Canadian Journal of Zoology 83:1-17.
Mierzejewski P & Kulicki C (2003) Cortical fibrils and secondary deposits in the periderm of the hemichordate Radbdopleura (Graptolithoidea). Acta Palaeontologica Polonica 48:99-111.