Crabs & Others · Marine Life · True crabs

Tuberculate crab (Plagusia squamosa)

Composite image of the dorsal and underside view of a juvenile tuberculate crab recorded from the samples
I processed during my PhD. Port Edward, KwaZulu-Natal (2022) – iNaturalist

Also referred to as the scaly rock crab. Formerly considered a subspecies of Plagusia depressa (as Plagusia depress subsp. tuberculata).

Similar to the Cape rock crab, except for its pale-brown carapace, bumpy and quite coarse, seemingly scaly, with two notches between the eyes that house the first antennae, three marginal teeth, and the numerous tubercules on its back.

About 50 mm.

Occurs on exposed rocky shores in Natal and Moçambique. Also commonly referred to as ‘rafting crabs’ due to their propensity to live on pelagic marine animals, such as sea turtles. Although contained to the Indo-Pacific, the scaly rock crab has been recently recorded from the Mediterranean Sea, most likely after human introduction or range expansion due to different ecological stresses.

Two Oceans: A Guide to the Marine Life of Southern Africa (2007)

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