Galapagos Species Database
The Galapagos Species Database shares the information about the species from our Natural History Collections.
Acar gradata
Arca acanalada, Ribbed ark
(B. gradata) Shallow water (less than 200 m depth), intertidally on rocky shores or dredged in depths to 37 m.
Domain
Eukaryota
Kingdom
Animalia
Phylum
Mollusca
Class
Bivalvia
Order
Arcida
Superfamily
Arcoidea
Family
Arcidae
Genus
Acar
Species
gradata
Taxon category: Accepted
Syn.: Arca gradata Broderip & G. B. Sowerby I, 1829, Arca panamensis Bartsch, 1931, Barbatia gradata (Broderip & G. B. Sowerby I, 1829) (Horton et al., 2021); (B. gradata) AMNH: 73894, 87138, 87139, ANSP: 81775, 153348, LACM: several lots (ex.: 66-120), BMNH: acc. no. 2271: 1 lot (Charles Lyell coll., C. Darwin material), MHNG: 993-163, CDRS: 608, 609, 610, FNRS-Belgian expedition to the Galapagos, 1984, MHNG: expedition to the Galapagos, 1993
Origin: Native
Map of specimen collection localities or observation records for this species in our collections database.
Distribution: (B. gradata) Baja California to Perú and 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.
- Finet, Y. (1991) The Marine Mollusks of the Galapagos Islands. In: Galápagos Marine Invertebrate. Taxonomy, Biogeography, and Evolution in Darwin's Islands. Plenum Press. New York and London, p. 253-280.
- Keen, A.M. (1958) Sea Shells of Tropical West America. Stanford University Press, Palo Alto, 1st edition, 624 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.
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, Acar gradata", dataZone. Charles Darwin Foundation, https://datazone.darwinfoundation.org/en/checklist/?species=19943. Accessed 7 September 2025.