inachids

Inachids are a family of crabs belonging to the infraorder Brachyura, commonly known as true crabs. This family is characterized by their generally small to medium size and often elongated or triangular carapaces. They are found in marine environments, inhabiting a variety of substrates from rocky shores to sandy bottoms and seagrass beds. Inachids are a diverse group with a global distribution, though they are particularly well-represented in temperate and tropical waters.

The morphology of inachids can vary significantly, but many species possess long, slender legs, which can give them a spider-like appearance, leading to the common name "spider crabs" for some members. Their chelipeds, or claws, are also often elongated and slender. Many inachids are adept at camouflage, using their legs and bodies to attach seaweed, sponges, or other debris, helping them blend into their surroundings and avoid predators. Their diet typically consists of algae, detritus, and small invertebrates. Reproduction in inachids follows the typical pattern for brachyuran crabs, involving external fertilization and a larval stage. They play a role in marine ecosystems as both prey and consumers.