Pachygrapsus planifrons

, Pachygrapsus planifrons, Pachygrapsus planifrons

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Pachygrapsus planifrons, commonly known as the “Shore Crab,” is a crab species that is found in a variety of intertidal habitats along the Pacific coast of North America. This species exhibits a range of interesting adaptations that allow it to thrive in this dynamic environment.

Description & Characteristics

Pachygrapsus planifrons is a medium-sized crab with a carapace width that typically ranges from 2.5 to 4 centimeters. Its carapace, the hard upper shell, is generally a mottled brown or greenish color, often blending in with the rocky surfaces it inhabits. The crab’s claws are relatively small, and it has five pairs of legs, with the last pair being adapted for walking.

Habitat and Occurrence

Pachygrapsus planifrons is an intertidal species, meaning it lives in the area between the high and low tide marks. It is commonly found on rocky shores, tide pools, and even seawalls. This crab is well-adapted to the harsh conditions of the intertidal zone, which is characterized by fluctuating salinity, temperature, and exposure to air and water. The species is primarily associated with the infralittoral zone, which encompasses the lower intertidal region.

Taxonomy

Pachygrapsus planifrons is classified within the Animal Kingdom, belonging to the Phylum Arthropoda. It is a member of the Class Malacostraca, which encompasses a wide range of crustaceans. This species is further categorized under the Order Decapoda, a group that includes crabs, lobsters, and shrimps. It is a member of the Family Grapsidae, known as the “grapsid crabs,” which are characterized by their generally flattened bodies and adaptations for living in intertidal and nearshore environments.

Feeding

Pachygrapsus planifrons is an omnivore, feeding on a variety of organisms and materials. Its diet typically includes algae, barnacles, mussels, and other invertebrates. This crab is known to be a scavenger as well, consuming dead organisms and detritus. Its feeding habits are crucial for maintaining the balance of the intertidal ecosystem.

Associated Species

Image References

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