Petrolisthes boscii

, Petrolisthes boscii, Petrolisthes boscii
Water Type: Marine

Petrolisthes boscii, commonly known as the “Bosc’s porcelain crab,” is a species of crab belonging to the family Porcellanidae. These crabs are known for their distinctive flattened bodies, resembling porcelain, hence their common name. They are relatively small crustaceans, inhabiting a variety of marine environments.

Description & Characteristics

Petrolisthes boscii crabs typically reach a maximum size of approximately 20 millimeters in length. They possess a smooth, somewhat flattened carapace, characteristic of porcelain crabs. The carapace is typically white or light brown in color, with some individuals exhibiting faint reddish hues. Their legs are relatively short and stout, equipped with small, flattened claws. They have a distinctive “porcelain” appearance, a characteristic trait of the Porcellanidae family.

Habitat and Occurrence

Petrolisthes boscii primarily resides in the intertidal zone of rocky shores. They are typically found in the lower intertidal zone, where they are more frequently submerged. They are often found attached to rocks, kelp, and other marine vegetation. These crabs can be commonly found in the infralittoral zone, the shallow marine environment that extends from the low tide mark down to the lower limit of the photosynthetic zone.

Taxonomy

Petrolisthes boscii belongs to the Class Malacostraca, Order Decapoda, and Family Porcellanidae. This family is characterized by its flattened bodies and porcelain-like appearance. They are among the diverse group of decapods, known for their ten legs, which include a pair of large claws. These crabs are further classified within the genus Petrolisthes, encompassing a variety of porcelain crab species with similar characteristics.

Feeding

Petrolisthes boscii is an omnivorous crab, feeding on a variety of organic matter found in its environment. This includes algae, detritus, and small invertebrates. Their feeding habits contribute to the overall health of the marine ecosystem by recycling organic matter. Their relatively small size and flattened bodies allow them to maneuver through crevices and under rocks, searching for food sources.

Associated Species

Image References

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