The anatomy of O. Caribaeus. is very similar to all members of the Xenophoridae family. Their shells have a flat bottom and a short conical spiral on top.[2] They are known for their ability to camouflage by attaching substrates like pebbles, sand, empty shells, and even coral to the top of their shells.[3] The specifics of how this is done are not known.[4] However, we know that these foreign objects are fused to the shells in all different conformations, radially, laterally, or symmetrically as the shell grows.[5] The shells can reach a maximum height of 45 mm, in average 37 mm. The diameter of the base reaches a maximum length of 88 mm, in average 60 mm. The colour of the dorsum is yellowish-white.[6] Like other snails, O. Caribaeus have a radula, used for scraping detritus and other substances off of substrates to feed on, and a muscular foot used for locomotion.[7]
Distribution
Onustus caribaeus is distributed in the North-eastern Gulf of Mexico, the Caribbean Sea and along the Atlantic coast of Brazil between 35m and 640m (mostly deeper than 100m).[6]
J. E. MORTON, THE ADAPTATIONS AND RELATIONSHIPS OF THE XENOPHORIDAE (MESOGASTROPODA), Journal of Molluscan Studies, Volume 33, Issue 3, December 1958, Pages 89–101, https://doi.org/10.1093/oxfordjournals.mollus.a064812
A. G. Beu (1977) New Zealand Cenozoic Gastropods of the genus Xenophora Fischer, 1807, Journal of the Royal Society of New Zealand, 7:2, 229-241, doi:10.1080/03036758.1977.10427161
Crippa, Pasinetti, G., & Dapiaggi, M. (2020). How did the carrier shell Xenophora crispa (König, 1825) build its shell? Evidence from the Recent and fossil record. Lethaia, 53(4), 439–451. https://doi.org/10.1111/let.12367
Feinstein, & Cairns, S. D. (1998). Learning from the collector: A survey of azooxanthellate corals affixed by Xenophora (Gastropoda: Xenophoridae), with an analysis and discussion of attachment patterns. The Nautilus (Philadelphia).
Kreipl, K. & Alf, A. (1999): Recent Xenophoridae. 148 pp. incl. 28 color plts. ConchBooks, Hackenheim, ISBN 3-925919-26-0
Arquivos de zoologia. (1967). Museu de Zoologia da Universidade de São Paulo.