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Two new species of the family   Alpheidae  :    Alpheus   margaritae    sp. n.  and    Leptalpheus   melendezensis    sp. n.  are described from Santa María-La Reforma, coastal lagoon, SE Gulf of California.    Alpheus   margaritae    sp. n.  is closely related to    A.   antepaenultimus    and    A.   mazatlanicus    from the Eastern Pacific and to    A.   chacei    from the Western Atlantic, but can be differentiated from these by a combination of characters, especially the morphology of the scaphocerite and the first pereopods.    Leptalpheus   melendezensis    sp. n.  resembles    L.   mexicanus    but can be easily differentiated because    L.   melendezensis    sp. n.  has the anterior margin of the carapace broadly rounded and has only one spine on the mesial margin of ischium in themajorcheliped  , versus an acute rostrum and an unarmedmajorcheliped  . Additionally, a phylogenetic analysis was used to explore the relationships of these two new taxa. These results show that    Alpheus   margaritae    sp. n.  and    Leptalpheus   melendezensis    sp. n.  are indeed related to the species against which we are comparing them, and demonstrate that they can be considered as different species. Additional specimens of   Leptalpheus   cf.   mexicanus  ,    Ambidexter   panamensis    and    A.   swifti    are recorded for the first time in the Santa María-La Reforma coastal lagoon.

zookeys

New records and description of two new species of carideans shrimps from Bahía Santa María-La Reforma lagoon, Gulf of California, Mexico (  Crustacea  ,   Caridea  ,   Alpheidae   and   Processidae  )