Galapagos Species Database
The Galapagos Species Database shares the information about the species from our Natural History Collections.
Isognomon janus
ostra, Oyster
Shallow water (less than 200 m depth).
Domain
Eukaryota
Kingdom
Animalia
Phylum
Mollusca
Class
Bivalvia
Order
Ostreida
Superfamily
Pterioidea
Family
Isognomonidae
Genus
Isognomon
Species
janus
Taxon category: Accepted
LACM: 33-89, 34-180, 66-119 (fide Kaiser, 1997)
Origin: Native
Map of specimen collection localities or observation records for this species in our collections database.
- 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.
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, Isognomon janus", dataZone. Charles Darwin Foundation, https://datazone.darwinfoundation.org/en/checklist/?species=9573. Accessed 1 November 2026.