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Este artículo contiene 35 páginas, 6 figuras, 5 tablas., The history of colonization and dispersal of fauna among deep-sea chemosynthetic ecosystems remains enigmatic and poorly understood. The distribution of squat lobsters of the genus Munidopsis Whiteaves, 1874 can be influenced by the rich organic matter and associated organism communities of chemosynthetic ecosystems. The present work analyzed the molecular relationships and morphology of individuals from different populations of Munidopsis exuta Macpherson & Segonzac, 2005 and M. geyeri Pequegnat & Pequegnat, 1970 in such ecosystems along the Atlantic Equatorial Belt, including the Chapopote Knoll, in the southern Gulf of Mexico. Munidopsis geyeri is re-described based on the present findings and reference to the literature. This analysis documented the genetic distances, as well as range of variation in the diagnostic characters that support the separation of M. exuta and M. geyeri. Our results confirm that the two species coexist in seep ecosystems and have an amphi-Atlantic distribution., The national and international projects that funded the present research included collaborations between the Re-search Center Ocean Margins (RCOM) of Bremen University, Germany, Study of the process related with fluid seep-age in oceanic ground (E project); the Instituto de Ciencias del Mar y Limnología, UNAM, Mexico, for open access payment; Factores que definen la variabilidad de la diversidad biológica y biomasa en el mar profundo del Golfo de México (PAPIIT), CONACyT 40158F. Molecular analysis was supported by the international collaboration between the University of Louisiana at Lafayette under funding to Darrly L. Felder from U.S. National Science Foundation grants NSF/BS&I DEB-0315995 and NSF/AToL EF-0531603, as well as from Texas A&M University and the Cen-tre d’Estudis Avançats de Blanes (CEAB-CSIC). RR wishes to acknowledge PRODEP-SEP, Mexico, through the program “Apoyo a la Incorporación de NPTC” (Ago/1/2018– Jul/31/2019). Illustrations of Mundiopsis geyeri (Figs 6C, D, E, I, J and N) were produced by Cassandra Robles Flores.