FIGURE 55. A in Brachyuran crabs (Crustacea, Decapoda) from the remote oceanic Archipelago Trindade and Martin Vaz, South Atlantic Ocean

FIGURE 55. A, Map of the South Atlantic Ocean showing major oceanic islands. B, Jaccard dissimilarity dendrogram. Note that TMV-FN-RA and AS-SH clustered into two distinct groups according to the composition of their crab fauna. C, Nonmetric multidimensional scaling (NMDS) applied to a dissimilarity matrix generated by Jaccard's (1908) coefficient. Note the species that cause segregation of the crab faunal assemblages between TMV-FN-RA and AS-SH, and the gradient in species composition between the two groups of islands formed by the amphi-Atlantic species. AS, Ascension; EA, eastern Atlantic; EP, eastern Pacific; FN, Fernando de Noronha; IWP, Indo-West Pacific; RA, Rocas Atoll; SH, Saint Helena; TMV, Trindade and Martin Vaz. WA, western Atlantic.