Tridacna derasa

Tridacnidae
Giant Clam
  • Tridacna derasa, Tobias Reef, Queensland, Australia, 1 of 2, Photo: Andrew Green
    Tridacna derasa, Tobias Reef, Queensland, Australia, 1 of 2, Photo: Andrew Green
  • Tridacna derasa, Tobias Reef, Queensland, Australia, 2 of 2, Photo: Andrew Green
    Tridacna derasa, Tobias Reef, Queensland, Australia, 2 of 2, Photo: Andrew Green
  • Tridacna derasa, Coral Sea, Australia, Photo: Ian Shaw
    Tridacna derasa, Coral Sea, Australia, Photo: Ian Shaw
  • Tridacna derasa, Great Barrier Reef, Australia, Photo: Graham Edgar
    Tridacna derasa, Great Barrier Reef, Australia, Photo: Graham Edgar
  • Tridacna derasa, Rowley Shoals, Western Australia, Photo: Graham Edgar
    Tridacna derasa, Rowley Shoals, Western Australia, Photo: Graham Edgar
  • Tridacna derasa, Flinders Reef, Coral Sea, Photo: Andrew Green
    Tridacna derasa, Flinders Reef, Coral Sea, Photo: Andrew Green
  • Tridacna derasa, Swains Reefs, Coral Sea 1 of 2, Photo: Andrew Green
    Tridacna derasa, Swains Reefs, Coral Sea 1 of 2, Photo: Andrew Green
  • Tridacna derasa, Swains Reefs, Coral Sea, 2 of 2, Photo: Andrew Green
    Tridacna derasa, Swains Reefs, Coral Sea, 2 of 2, Photo: Andrew Green
Distribution
Description
Very symmetrical and smooth shell with many (6-7) ribs; mantle hardly extends beyond shell. The definitive feature for T. derasa is the flat curves of the shell (i.e. wavelength along shell edge is much greater than amplitude), particularly towards the ends. Mantle pattern often contains thin streaks or lines.
Information
  • Max Size: 52 cm
  • Sea Temperature Range: 21.2-30.4°C
Rarity
  • IUCN Threat Status: Vulnerable
  • Occurrence: Frequent (16% of sites)
    Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed
  • Abundance: Few (2 per transect)
    Abundance is calculated as the average number of individuals recorded per RLS transect, where present.
Edit by: Andrew Green
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