A meter-long fresh specimen removed from its calcareous tube with a valve (v), siphon (s), and pallet (p) indicated.

Photo from “Discovery of chemoautotrophic symbiosis in the giant shipworm Kuphus polythalamia (Bivalvia: Teredinidae) extends wooden-steps theory” by Dan Distel et al., published online at Proceedings of the National Academy of Sciences on April 17, 2017 (www.pnas.org/cgi/doi/10.1073/pnas.1620470114)