Abstract
The genus Atlantirivulus was recently established by Costa (2011) to comprise a well supported monophyletic group of killifish species formerly known as Rivulus santensis superspecies (Huber 1992), R. janeiroensis group (Costa 1998), or R. santensis species group (Costa 2004). Presently, Atlantirivulus includes 11 valid species (A. depressus, A. haraldsiolii, A. janeiroensis, A. jurubatibensis, A. lazzarotoi, A. luelingi, A. nudiventris, A. riograndensis, A. santensis, A. simplicis, and A. unaensis) distributed along coastal river basins and lagoons of eastern Brazil (Costa 2008a, b, Costa and De Luca 2009, Costa and Lanes 2009). This genus presents unique morphological features among aplocheiloid fishes, represented by a curved ventral process of angulo-articular and numerous infraorbital neuromasts arranged in a zig-zag pattern ACTA ICHTHYOLOGICA ET PISCATORIA (2012) 42 (3): 247–252 DOI: 10.3750/AIP2011.42.3.09
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