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Specimens were examined morphologically using both light microscopy and scanning electron microscopy. Additionally, we generate DNA sequences for the following loci: mitochondrial\n                      <jats:italic>cox<\/jats:italic>\n                      1 and nuclear 5.8S rRNA and ITS-2 and 28S rDNA.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The new species,\n                      <jats:italic>Gnathostoma mexicanum<\/jats:italic>\n                      n. sp., differs from\n                      <jats:italic>G. turgidum<\/jats:italic>\n                      Stossich, 1902, the common gnathostomid species infecting\n                      <jats:italic>Didelphis<\/jats:italic>\n                      spp. from the Americas, in its smaller body size, fewer teeth on the cuticular spines at anterior half of body, as well as site of infection (pyloric region vs. stomach layers). Host specificity further distinguishes the two species. Additionally, molecular data show that the new species clearly diverges from its congeners.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>\n                      This work represents the fourth\n                      <jats:italic>Gnathostoma<\/jats:italic>\n                      species described for Mexican mammals and the eight recorded in the Americas.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s11686-025-01155-3","type":"journal-article","created":{"date-parts":[[2025,11,14]],"date-time":"2025-11-14T16:53:17Z","timestamp":1763139197000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A New Neotropical Species of Gnathostoma (Nematoda: Gnathostomatidae) from the Northern Four-Eyed Opossum Philander vossi (Marsupialia)"],"prefix":"10.1007","volume":"70","author":[{"given":"M. \u00c1.","family":"Mosqueda-Cabrera","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E.","family":"S\u00e1nchez-Miranda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L. 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