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Type material of several polychaete species described by Enrique Rioja from Mexican coasts are lost, and the current status of some species is doubtful.    Nereis   oligohalina    (Rioja, 1946) was described from the Gulf of Mexico, but it has been considered a junior synonym of    N.   occidentalis    Hartman, 1945, or regarded as a distinct species with an amphiamerican distribution. On the other hand,    N.   garwoodi    González-Escalante &amp; Salazar-Vallejo, 2003, described from Chetumal Bay, Caribbean coasts, could be confused with    N.   oligohalina   . In order to clarify these uncertainties,    N.   oligohalina    is redescribed based on specimens from the Mexican Gulf of Mexico, including a proposed neotype; further,    N.   garwoodi    is redescribed including the selection of lectotype and paralectotypes, and    N.   confusa    sp. n.  is described with material from the Gulf of California. A key for the identification of similar species and some comments about speciation in nereidid polychaetes are also included.

zookeys

Redescriptions of    Nereis   oligohalina    (Rioja, 1946) and    N.   garwoodi    González-Escalante &amp; Salazar-Vallejo, 2003 and description of    N.   confusa    sp. n. (  Annelida  ,   Nereididae  )