West Indian spider crab

Maguimithrax spinosissimus has a reddish-brown carapace and walking legs. The claws are smooth, purplish gray, with a single row of nodules along the outer edge, and blunt claw tips. The legs are covered with numerous short spines and nodules. It is the largest native crab species of the Atlantic. It can reach up to 3 kg of weight and a carapace length of 18 cm.

Maguimithrax spinosissimus is found from North Carolina to Venezuela. It inhabits caves and reef underhangs from the shallow intertidal to depths of up to 200 m. It was made the type species of a separate genus Maguimithrax by Klompmaker et al. (2015). This genus is named after actor Tobey Maguire, who has starred as Spider-Man in 4 films.

The diet of this crab is largely unknown; however, it is considered a large omnivore that has been noted to feed on algae and carrion. It has been studied for its ability to remove seaweed from coral reefs due to its "powerful grazing ability". Unlike crabs such as the blue crab, the West Indian spider crab is not commercially harvested for its meat.