We stay on the lookout for different crabs on our beach walks
Posted By RichC on March 9, 2025
While on our walk on the beach the other day, we spotted an unusual looking crab (posted a couple crab photos last month and this month too). After a little digging on the Internet, I think this crab appears to be a Florida Rough Box Crab (Calappa gallus) or a closely related species of Box Crab (Calappidae family) … and yes, I used ChatGPT (4.0) to research this from my photo. 
Here are some key details:
Identification & Appearance:
- Shell (Carapace): Dome-shaped, rough, and textured, often with sand or debris clinging to it for camouflage.
- Coloration: Typically reddish-brown, tan, or sandy-colored to blend into the beach environment.
- Claws: Box crabs have disproportionately large claws that they tuck under their bodies, giving them a “boxy” appearance when at rest.
- Legs: Short and sturdy, adapted for burrowing rather than swimming.
Habitat & Range:
- Found in shallow coastal waters, sandy beaches, and seafloors along the Atlantic and Gulf coasts of Florida.
- Often buries itself in sand for protection from predators and to ambush prey.
- Commonly found washed up on beaches after storms or rough surf.
Diet & Behavior:
- Primarily scavengers and carnivores, feeding on small mollusks, clams, and other shellfish by cracking their shells with powerful claws.
- Nocturnal behavior—most active at night while hunting or burrowing.
- Their camouflaged shell helps them avoid detection from predators like fish, birds, and larger crabs.
Interesting Facts:
- Sometimes referred to as a Shame-faced Crab due to how it tucks its claws under its body.
- Despite their intimidating look, they are not aggressive toward humans.
- Their natural defense mechanism is burying themselves in sand rather than fighting.
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