Achirus mucuri Ramos, Ramos & Lopes 2009

Achirus mucuri is distinguished from all its congeners, except A. novoae, bypossessing a connection on both the blind and ocular sides between the branchiostegal membrane and the isthmus, with the connection being slightly stronger on the blind side (vs. complete absence of connections between branchiostegal membranes and isthmus). Additionally, the species is distinguished from its congeners by having a light-brown body color, with regularly-scattered, minute, darkbrown blotches that are sometimes concentrated to form larger spots. Five specimens differed from the typical light-brown body color in having a brownish-gray background, and one specimen showed brownish-white body pigmentation. The new species differs from A. novoae by the presence of a large, ramified labial fimbriae (vs. simple, non-ramified, minute labial fimbriae in A. novoae) and by the shape of the infraorbital canal (extending around ventral margin of fixed eye) (vs. infraorbital canal thatstops dorsal to fixed eye in A. novoae (Ref. 80995).

The American sole (Achirus mucuri) is a species of sole in the family Achiridae. It was described by Robson Tamar da Costa Ramos, Telton Pedro Anselmo Ramos and Paulo Roberto Duarte Lopes in 2009. It inhabits the Mucuri River in Brazil, from which its species epithet is derived. It reaches a maximum standard length of 9 cm (3.5 in).

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Achirus mucuri Achirus generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Achiridae familian.

馬氏無臂鰨為輻鰭魚綱鰈形目鰨亞目無臂鰨科的其中一種，分布於南美洲巴西東北部Mucuri河半鹹水、海域，體長可達9公分，棲息在沿岸潟湖、河口區底層水域，以多毛類、甲殼類及小魚為食，生活習性不明，可作為食用魚。