Donax (bivalve)

Donax
A group of shells of Donax variabilis showing color variation
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Veneroida
Family: Donacidae
Genus: Donax
Species

See text

Synonyms
  • Capsella Gray, 1851
  • Grammatodonax Dall, 1900

Donax is a genus of small, edible saltwater clams, marine bivalve mollusks. The genus is sometimes known as bean clams or wedge shells; however, Donax species have numerous different common names in different parts of the world. In the southeastern US they are known as "coquina", a word that is also used for the hard limestone concretions of their shells and those of other marine organisms.

Ecology

Species of Donax live, sometimes in high concentrations, vertically aligned in the sand on exposed beaches, on tropical and temperate coasts worldwide. When the waves wash these small clams out of the sand, they can dig back in again quite rapidly. They are filter feeders. Some species, such as Donax variabilis, migrate vertically and horizontally with changes in the tides. These coquina clams are found extensively on the east coast beaches of Trinidad (Mayaro) and widely available in Venezuela. They are called "Chip Chip" in Trinidad & Tobago and "Chipi Chipi" in Venezuela.

Species

Donax cuneatus shell

Species within the genus Donax include:

  • Donax asper Hanley 1845[1]
  • Donax assimilis Hanley, 1845[1]
  • Donax baliregteri Huber, 2012[1]
  • Donax bertini Pilsbry, 1901[1]
  • Donax bipartitus Sowerby III, 1892[1]
  • Donax brazieri E.A. Smith, 1892[1]
  • Donax bruneirufi Huber, 2012
  • Donax burnupi Sowerby III, 1894[1]
  • Donax caelatus Carpenter, 1857[1]
  • Donax californicus Conrad, 1837[1]
  • Donax carinatus
  • Donax clathratus Reeve, 1855[1]
  • Donax culter Hanley
  • Donax cuneatus
  • Donax cuneatus Linnaeus, 1758[1]
  • Donax denticulatus
  • Donax dentifer
  • Donax ecuadorianus Olsson, 1961[1]
  • Donax erythraeensis Bertin, 1881[1]
  • Donax faba
  • Donax fossor - was thought at one time to be a northern form of D. variabilis
  • Donax gemmula Morrison, 1971[1]
  • Donax gouldii - The bean clam, aka Donax gracilis Hanley 1845[1]
  • Donax hanleyanus
  • Donax kindermanni (Philippi, 1847)[1]
  • Donax lubricus Hanley, 1845[1]
  • Donax madagascariensis
  • Donax nitidus Deshayes, 1855[1]
  • Donax obesulus Reeve 1854[1]
  • Donax obesus d'Orbigny, 1845[1]
  • Donax oweni
  • Donax pallidus
  • Donax paxillus Reeve, 1854[1]
  • Donax peruvianus
  • Donax punctatostriatus
  • Donax rothi Coan, 1983[1]
  • Donax semistriatus Poli, 1795[1]
  • Donax serra Röding, 1798[1]
  • Donax simplex Sowerby III, 1897[1]
  • Donax sordidus Hanley, 1845[1]
  • Donax striatus Linnaeus, 1767[1]
  • Donax texasianus Philippi, 1847[1]
  • Donax townsendi Sowerby III, 1894[1]
  • Donax transversus G. B. Sowerby I, 1825[1]
  • Donax trunculus - Locally known as tellin in French, tellina or telline in Italian, coquina in Spanish and conquilha or cadelinha in Portuguese.
  • Donax variabilis - Known in Florida under the Spanish word "coquina", is the common and colorful Donax species of the southern Atlantic and Gulf shores from Virginia to the Caribbean. This species is locally abundant on beaches with fine sand from the mid-Atlantic coast to Texas.
  • Donax variegatus
  • Donax vellicatus Reeve, 1855[1]
  • Donax veneriformis Lamarck, 1818[1]
  • Donax venustusus
  • Donax vittatus

The empty small (15 to 25 mm) shells of Donax variabilis and Donax fossor may be found washed up on the beach, especially at low tide. The living animals can often be seen where the waves wash the sand around in the most shallow part of the littoral zone as the tidal level changes. These clams can use the action of waves to move themselves up and down the beach, quickly burrowing into a new location before they can be swept away (the so-called "dance of the coquina").

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 eol Encyclopedia of Life

Further reading

  • The Nautilus, On the species of Donax of Eastern North America , March 1892, pp. 125-126
  • Wayne A. O'Connor & Stephan J. O'Connor, "Early ontogeny of the pipi, Donax (Plebidonax) deltoides (Donacidae; Bivalvia)"; Molluscan Research 31(1): 53–56; ISSN 1323-5818
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