I am planning on getting some Halloween Crabs (Gecarcinus quadratus) for my birthday soon but I still have a few unanswered questions I. Dry season distribution of land crabs, Gecarcinus quadratus (Crustacea: Gecarcinidae), in Corcovado National Park, Costa Rica. Megan E. Griffiths1,2, Basma. Rev Biol Trop. Mar;54(1) Influence of land crabs Gecarcinus quadratus (Gecarcinidae) on distributions of organic carbon and roots in a Costa .
For the species of hermit crab, see Halloween hermit crab. Gecarcinus quadratusknown as the red land crab,  whitespot crab,  halloween crab,  moon crab, halloween moon crab, mouthless crab  or harlequin land crab,  is a colourful land crab from the family Gecarcinidae. Grapsoidea Terrestrial crustaceans Crustaceans described in Moon crab, harlequin land crab, Mexican land crab, mouthless crab.
This is a crab that digs burrows in the riverbanks and shorelines it lives on to hide from predators and the sun. Adults eat leaves and seeds, removing them from the surface and hoarding them in their burrows.
The ideal system for them is a small terrarium or riparium.
The decapod crustaceans of Estero el Verde. Note the white spots towards the rear of the carapace. They live mostly on leaf litter and other vegetation, but are omnivores and will eat just about anything as long as it’s fresh. They also need a consistent source of calcium, so take this into account when feeding them.
The planktonic stage in this species lasts for at least a month, following which young crabs settle and develop in coastal habitats. A riparium more exactly fits the habitat they come from, and a small terrarium would still have to incorporate some water. This nocturnal crab digs burrows — sometimes as long as 1. Gecarcinus ruricola has darker, purple limbs and a purplish carapace without ‘eyes’. The species preferentially feeds on the seeds of particular types of plant, favouring the persistence of some at the expense of others.