On a small collection of mysids (Crustacea, Peracarida, Mysida) from the southern Gulf of California, western Mexico, with the description of new species of Mysidium and Cubanomysis Author Hendrickx, Michel E. Author Hernández-Payán, José Carlos 0000-0003-1483-1289 Postgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Av. Universidad 3000, Ciudad Universitaria, Coyoacán, Ciudad de México 04510, Mexico. https: // orcid. org / 0000 - 0003 - 1483 - 1289 Author Gómez-Gutierrez, Jaime Centro Interdisciplinario de Ciencias Marinas, Instituto Politécnico Nacional, La Paz, Baja California Sur 23000, Mexico. text Zootaxa 2023 2023-10-26 5360 2 194 218 https://www.mapress.com/zt/article/download/zootaxa.5360.2.2/52113 journal article 10.11646/zootaxa.5360.2.2 1175-5326 10145567 48554152-4466-4ED7-A50F-4464A1722FE7 Metamysidopsis frankfiersi Hendrickx & Hernández-Payán, 2023 Metamysidopsis frankfiersi Hendrickx & Hernández-Payán, 2023: 432‒444 , figs. 4‒10. Material examined. One male (CL 1.33 mm , TL 3.72 mm ), April 18, 2016 , Los Morros ( 23°27’N , 109°25’W ), Cabo Pulmo National Park , Southern Baja California , Mexico , about 5 m deep (ICML-EMU-13274 Remarks. Metam ysidopsis W.M. Tattersall, 1951 , is a small genus containing nine species (one with two subspecies) ( Mees & Meland 2012 onwards). Two of these have been currently reported for the eastern Pacific: M. elongata elongata (Holmes, 1900) and M. pacifica (Zimmer, 1918) . Hendrickx & Hernández-Payán (2023) suggest that the two subspecies of elongata , M. e. elongata and M. e. atlantica Băcescu, 1968 , reported in shallow waters on both sides of the American continent, should be lifted from subspecies to species based on clear geographic separation and morphological differences summarized by Băcescu (1969) . The same authors ( Hendrickx & Hernández-Payán 2023 ) described a new species of Metamysidopsis also collected during the present survey, Metamysidopsis frankfiersi , currently know only from the southern Gulf of California, Mexico .