Percnon

Percnon is a genus of crabs in the family Sesarmidae, commonly known as “sesarmid crabs.” These crabs are found in the Indo-Pacific region, inhabiting intertidal and mangrove environments. They are known for their distinctive coloration, varying between species, and their ability to tolerate a wide range of salinity levels.

China Rock Crab – Percnon sinense

Common Names

Common names for crabs in the Percnon genus include:

  • Mangrove crab
  • Fiddler crab (specifically referring to the species Percnon gibbesi)
  • Purple crab (specifically referring to the species Percnon planissimum)

Characteristics

Percnon crabs share several common characteristics:

  • Size: Typically small to medium-sized, with carapace widths ranging from a few centimeters to around 10 cm.
  • Coloration: Often brightly colored, with variations in patterns and shades depending on species.
  • Body Shape: Possessing a somewhat flattened carapace with a prominent rostrum (a pointed projection).
  • Chelipeds (Claws): Generally possessing one larger, dominant cheliped, particularly in males.
  • Habitat: Primarily found in intertidal zones, mangroves, and rocky shores.
  • Diet: Mostly omnivorous, feeding on algae, detritus, and small invertebrates.

Environments

Percnon crabs are adapted to living in various environments, including:

  • Intertidal Zones: They can tolerate fluctuations in salinity and temperature.
  • Mangrove Forests: They often burrow in the mud and roots of mangrove trees.
  • Rocky Shores: Some species, like Percnon planissimum, prefer rocky habitats.

References

For further information on the genus Percnon, consult these reliable sources: