Grapsus
Grapsus is a genus of crabs belonging to the family Grapsidae, commonly known as the “shore crabs” or “rock crabs”. They are found in intertidal and supratidal zones throughout the world, particularly in tropical and subtropical regions. These crabs are well-adapted to living in these harsh environments, exhibiting a variety of unique characteristics that allow them to thrive in the face of changing tides, temperature fluctuations, and predation.
Common Names
Crabs belonging to the genus Grapsus are commonly referred to as "shore crabs" or "rock crabs". This name reflects their typical habitat along rocky shorelines and their ability to navigate both the intertidal zone and the supratidal zone.
Characteristics
Grapsus crabs possess several key characteristics that distinguish them from other crab species. These include:
- Quadrate Carapace: Their carapace, or upper shell, is typically broad and rectangular, providing a strong, protective covering.
- Prominent Eyes: They have large, prominent eyes positioned on stalks, enhancing their visual acuity.
- Short, Stout Legs: Their legs are short and stout, providing powerful gripping and climbing capabilities.
- Variable Coloration: The color of their carapace can vary depending on the species and their environment, ranging from dark brown to reddish-brown, and even greenish-blue.
Environment
Grapsus crabs are typically found in rocky intertidal and supratidal zones, where they often live in crevices and under rocks. These areas are characterized by frequent tidal fluctuations, varying temperatures, and exposure to both saltwater and freshwater.
References
For more in-depth information about the genus Grapsus, you can refer to the following reliable sources: