Hyastenus
Hyastenus is a genus of spider crabs in the family Majidae. It is distributed throughout the Indo-Pacific region, with some species extending into the Atlantic Ocean. They are generally characterized by their spiny carapace, long legs, and ability to camouflage themselves with sponges, algae, or other marine organisms.
Common Names
Common names for species within the genus Hyastenus vary depending on location and specific species. Some examples include:
- Spiny spider crab
- Decorator crab
- Sponge crab
Characteristics
Hyastenus crabs are distinguished by several key features:
- Spiny carapace: Their carapace is typically covered in numerous spines and tubercles, providing protection and camouflage.
- Long legs: They have relatively long and slender legs, which aid in their movement and foraging.
- Camouflage: Hyastenus crabs are known for their ability to camouflage themselves using sponges, algae, or other marine organisms. This helps them blend in with their surroundings and avoid predators.
- Size: They range in size from a few centimeters to over 20 centimeters in carapace width.
Environments
Hyastenus crabs inhabit a variety of marine environments, including:
- Coral reefs: They are commonly found among coral reefs, where they can find food and shelter.
- Seagrass beds: Some species prefer seagrass beds, where they can forage on small invertebrates.
- Rocky shores: They may also be found in rocky shore environments, where they can find crevices to hide.
References
For more information on Hyastenus, refer to the following resources: