Galapagos Species Database
The Galapagos Species Database shares the information about the species from our Natural History Collections.
Mactrotoma isthmica
Concha, Shell
(M. fonsecana) The shell is longer. Length: 53 mm; height: 34 mm; diameter: 17.5 mm.
Shallow water (less than 200 m depth).
Domain
Eukaryota
Kingdom
Animalia
Phylum
Mollusca
Class
Bivalvia
Order
Venerida
Superfamily
Mactroidea
Family
Mactridae
Genus
Mactrotoma
Species
isthmica
Taxon category: Accepted
Syn.: Mactra (Micromactra) vanattae Pilsbry & H. N. Lowe, 1932, Mactra (Micromactra) vanattae acymata Pilsbry & H. N. Lowe, 1932, Mactra fonsecana Hertlein & A. M. Strong, 1950, Mactra isthmica Pilsbry & H. N. Lowe, 1932, Mactra vanattae Pilsbry & H. N. Lowe, 1932, Mactra vanattae acymata Pilsbry & H. N. Lowe, 1932 (Horton et al., 2021)
Origin: Native
Map of specimen collection localities or observation records for this species in our collections database.
Distribution: (M. fonsecana) Nicaragua to Ecuador.
- Finet, Y. (2001) The marine mollusks of the Galapagos Islands: a documented faunal list. Editions du Muséum d' Histoire naturelle, Genève, 237 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, Mactrotoma isthmica", dataZone. Charles Darwin Foundation, https://datazone.darwinfoundation.org/en/checklist/?species=19984. Accessed 1 November 2026.