Abstract

VIOLANTE-HUERTA, Marco et al. First records of non-hyperiid planktonic amphipods (Amphilochidea and Senticaudata) from deep waters of southwestern Gulf of Mexico, with an identification key. Rev. Mex. Biodiv. [online]. 2020, vol.91, e912975.  Epub Mar 01, 2021. ISSN 2007-8706.  https://doi.org/10.22201/ib.20078706e.2020.91.2975.

Within the planktonic Amphipoda, the non-hyperiid species have been scarcely studied in the southern Gulf of Mexico. Zooplankton samples were obtained over a grid of 25 oceanographic stations in the southwestern area of the gulf using a stratified opening-closing plankton net system in epi- and mesopelagic zones (0-1,000 m depth). Sixty-nine individuals of non-hyperiid planktonic amphipods were obtained. Their taxonomic identification indicate the presence of 3 species of Amphilochidea, Cyphocaris anonyx Boeck, 1871, C. challengeri Stebbing, 1888, Eusiropsis riisei Stebbing, 1897, and 1 species of Senticaudata, Stenopleura atlantica Stebbing, 1888, representing the first records of these species in the region. A taxonomic account and information on their horizontal and vertical distribution in the studied area are provided. The presence of eyes in E. riisei is for the first time reported. An identification key for 7 species of Amphilochidea and Senticaudata recorded in the Gulf of Mexico is provided.

Keywords : Mesopelagic zone; Pelagic amphipods; Stenopleura atlantica; Stratified sampling; Vertical distribution; Western Atlantic Ocean.

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