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Cyclodius ungulatus
H. Milne Edwards, 1834

Hoof-Clawed Reef Crab

Joshua Gaschk (2014)


Fact Sheet



Physical Description


Life History & Behaviour

Anatomy & Physiology

Evolution & Systematics

Biogeographic Distribution

Conservation & Threats

References & Links

Conservation & Threats

Like all species linked in some way with coral reef environments C. ungulatus will experience a threat or decline with increasing temperature due to anthropogenic global warming. Coral bleaching has been shown to reduce crab density and fecundity, though the study was performed on a species which is know to eat mucus and tissue produced by the coral (Stella et al. 2011). Many behavioral changes have had noted correlation with coral bleaching, including usurping crabs of healthy corals, increased vigilance and forcefulness of crabs on healthy corals when bleached corals were in the area and weaker responses for crabs that inhabit bleached corals (Glynn et al. 1985). Although for most crab species associated with coral communities this looks bleak due to C. ungulatus' ability to efficiently distribute and utilize many habitats it is unlikely to make a large impact on the species other than a possible retraction from coral communities.