| Two new species of the genus <i>Mesochra, M. pacifica<i> n. sp. and</i>M. pseudoparva</i> n. sp. are described from Ensenada del Pabellón Lagoon (southeastern Gulf of California, Mexico). Both species are considered as most closely related to <i>M. parva</i> Thomson 1946, although they share some features with <i>M. sewelli</i> Lang 1948. A particular forked structure on the male P3 endopodite of <i>M. pseudoparva</i> n. sp. was found and the homology of this structure is discussed. An updated key to the species in the genus is provided. |
