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      The fiddler crabs (Crustacea: Brachyura: Ocypodidae: genus Uca) of the South Atlantic Ocean


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      Sociedade Brasileira de Carcinologia

      Genus Uca, South America, taxonomy

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          The taxonomy of the 11 species of fiddler crabs [Uca (Uca) maracoani (Latreille, 1802-1803), U. (U.) tangeri (Eydoux, 1835), U. (Minuca) burgersi Holthuis, 1967, U. (M.) mordax (Smith, 1870), U. (M.) rapax (Smith, 1870), U. (M.) thayeri Rathbun, 1900, U. (M.) victoriana von Hagen, 1987, U. (M.) vocator (Herbst, 1804), U. (Leptuca) cumulanta Crane, 1943, U. (L.) leptodactyla Rathbun, 1898 and U. (L.) uruguayensis Nobili, 1901] of the South Atlantic Ocean is reviewed. Keys for identification, updating the keys for the Atlantic Ocean are proposed, including the species recently described. Comments reporting morphological variations among types and additional material and among populations of different localities are included. The Atlantic species are divided into three subgenera: Uca s. str., Minuca and Leptuca. The eastern Atlantic species U. (U.)tangeri is included in subgenus Uca s. str. due to the presence of a proximal spine opposing the spoon-tipped setae of the second maxilliped, which is considered an apomorphic character of the subgenus Uca s. str.

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          Most cited references 165

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          Manual de identificação dos Brachyura (Caranguejos e Siris) do litoral brasileiro

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            The grapsoid crabs of America

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              Molecular phylogeny analysis of fiddler crabs: test of the hypothesis of increasing behavioral complexity in evolution.

              The current phylogenetic hypothesis for the evolution and biogeography of fiddler crabs relies on the assumption that complex behavioral traits are assumed to also be evolutionary derived. Indo-west Pacific fiddler crabs have simpler reproductive social behavior and are more marine and were thought to be ancestral to the more behaviorally complex and more terrestrial American species. It was also hypothesized that the evolution of more complex social and reproductive behavior was associated with the colonization of the higher intertidal zones. Our phylogenetic analysis, based upon a set of independent molecular characters, however, demonstrates how widely entrenched ideas about evolution and biogeography led to a reasonable, but apparently incorrect, conclusion about the evolutionary trends within this pantropical group of crustaceans. Species bearing the set of "derived traits" are phylogenetically ancestral, suggesting an alternative evolutionary scenario: the evolution of reproductive behavioral complexity in fiddler crabs may have arisen multiple times during their evolution. The evolution of behavioral complexity may have arisen by coopting of a series of other adaptations for high intertidal living and antipredator escape. A calibration of rates of molecular evolution from populations on either side of the Isthmus of Panama suggest a sequence divergence rate for 16S rRNA of 0.9% per million years. The divergence between the ancestral clade and derived forms is estimated to be approximately 22 million years ago, whereas the divergence between the American and Indo-west Pacific is estimated to be approximately 17 million years ago.

                Author and article information

                Role: ND
                Sociedade Brasileira de Carcinologia (Cruz das Almas )
                December 2012
                : 20
                : 2
                : 203-246
                [1 ] Universidade Federal Rural do Semi-Árido Brazil
                [2 ] Universidade Federal do Ceará Brazil
                Product Information: website

                Animal science & Zoology

                Genus Uca, South America, taxonomy


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