Libinia
Libinia is a genus of spider crabs in the family Epialtidae. These crabs are characterized by their long, spiny legs and relatively small bodies. They are found in a variety of marine habitats, including rocky shores, sandy bottoms, and seagrass beds. The genus includes several species, some of which are commercially important for their meat.
Common Names
Members of the genus Libinia are commonly referred to as "spider crabs" or "spiny spider crabs" due to their elongated legs. Some specific species have additional common names, such as "the calico crab" for Libinia emarginata.
Characteristics
Libinia crabs share several distinctive features:
- Spiny carapace: The upper shell or carapace of Libinia crabs is typically covered in numerous spines or tubercles.
- Long, slender legs: The legs of these crabs are disproportionately long compared to their body size, giving them a spider-like appearance.
- Small, compressed body: The body of Libinia crabs is relatively small and flattened, providing them with a low profile that allows them to maneuver through tight spaces and under rocks.
- Chelae (claws): They possess a pair of large, powerful chelae, which they use for defense and for capturing prey.
Environments
Libinia crabs inhabit a range of marine environments, including:
- Rocky shores: They are often found clinging to rocks or hiding beneath crevices.
- Sandy bottoms: Some species prefer sandy bottoms, burrowing into the sediment to avoid predators.
- Seagrass beds: Seagrass beds provide a rich habitat for Libinia crabs, offering food and shelter.