Galapagos Species Database
The Galapagos Species Database shares the information about the species from our Natural History Collections.
Lamarcka mutabilis
Arca variable, Ark
(A. mutabilis) Shallow water (less than 200 m depth), specimens may commonly be found under rocks.
Domain
Eukaryota
Kingdom
Animalia
Phylum
Mollusca
Class
Bivalvia
Order
Arcida
Superfamily
Arcoidea
Family
Arcidae
Genus
Lamarcka
Species
mutabilis
Taxon category: Accepted
Syn.: Arca constricta Dunker, 1868, Arca crossei Dunker, 1871, Arca mutabilis (G. B. Sowerby I, 1833), Byssoarca mutabilis G. B. Sowerby I, 1833 (Horton et al., 2021) (A. mutabilis) LACM: A-2777, MHNG: expedition to the Galapagos, 1993
Origin: Native
Map of specimen collection localities or observation records for this species in our collections database.
Distribution: (A. mutabilis) Baja California to Ecuador (Galapagos Islands).
- Finet, Y. (2001) The marine mollusks of the Galapagos Islands: a documented faunal list. Editions du Muséum d' Histoire naturelle, Genève, 237 pp.
- Hickman, C.P. Jr. Finet, Y. (1999) A Field Guide to the Marine Molluscs of Galápagos. Sugar Spring Press, Lexington, Virginia, 150 pp.
- Horton, T. Horton, T., Kroh, A., Ahyong, S., Bailly, N., Boyko, C. B., Brandão, S. N., Gofas, S., Hooper, J. N. A., Hernandez, F., Holovachov, O., Mees, J., Molodtsova, T. N., Paulay, G., Decock, W., Dekeyzer, S., Poffyn, G., Vandepitte, L., Vanhoorne, B., Adlard, R., ... Zhao, Z. (2021) World Register of Marine Species. Available from https://www.marinespecies.org at VLIZ.
- Keen, A.M. (1958) Sea Shells of Tropical West America. Stanford University Press, Palo Alto, 1st edition, 624 pp.
You are welcome to download and use the information found in this page, acknowledging its source.
This page should be cited as follows:
"Galapagos Species Database, Lamarcka mutabilis", dataZone. Charles Darwin Foundation, https://datazone.darwinfoundation.org/en/checklist/?species=19941. Accessed 31 October 2026.