Caprellids (Crustacea: Amphipoda) from the Gulf of Mexico, with observations on <i>Deutella mayeri</i>, redescription of <i>Metaprotella hummelincki</i>, a taxonomic key and zoogeographical comments

Seventeen species of caprellid amphipods have been recorded so far in the Gulf of Mexico. New distributional and habitat data are included for 12 species. <i>Pseudaeginella biscaynensis</i> has been recorded again in the Gulf of Mexico for the first time since it was originally described 45 years ago. New morphological information based on the development of <i>Deutella mayeri</i> and a redescription of <i>Metaprotella hummelincki</i> are also provided, along with a key for species identification and zoogeographical comments at the regional and global scales.