- Animals
- ›Molluscs
- ›Bivalves
- ›Autobranchia
- ›Heteroconchia
- ›Euheterodonta
- ›Imparidentia
- ›True Cockles, Tellins, and Allies
- ›Cardioidea
- ›true cockles
- ›Lymnocardiinae
- ›Adacnini
Didacna
Didacna is a genus of brackish-water bivalve molluscs of the cockle family (Cardiidae) characterized by rounded-triangular, oval or trapezoidal shells with flattened ribs. It includes about 90 accepted species, 9 of which are extant and endemic to the Caspian Sea. The genus presumably originated in the Black Sea and the Caspian Sea basins during the Pleistocene around 900,000 years ago. However, several fossil species from older deposits outside of those basins have also sometimes been classified...
9 branches of this genus, most-observed first
Didacna trigonoides
speciesDidacna trigonoides
Didacna baeri
speciesDidacna baeri
Didacna profundicola
speciesDidacna profundicola
Didacna protracta
speciesDidacna protracta
Didacna barbotdemarnii
speciesDidacna barbotdemarnii
Didacna eichwaldi
speciesDidacna eichwaldi
Didacna pyramidata
speciesDidacna pyramidata
Didacna longipes
speciesDidacna longipes
Didacna parallella
speciesDidacna parallella
Where it lives
Recorded sightings
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geo-referenced records in GBIF, from museums, herbaria and field observers.
Drag the globe to turn it. Dots are where records exist, not a range map; darker means more records.
In the stacks
Searching the stacks…
Every page naming Didacna in the Biodiversity Heritage Library →
This page is assembled live from iNaturalist, GBIF, Wikipedia, the Source Library and the Internet Archive. It is not yet part of the hand-edited codex. iNaturalist taxon 566377.