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Snakes of this family exhibit substantial interspecific morphological variation in their oral glands. Particular variables are the venom glands, ranging from large (e.g., <jats:italic>Subsessor bocourti<\/jats:italic>) to small (e.g., <jats:italic>Erpeton tentaculatum<\/jats:italic>). The supra\u2010 and infralabial glands are more uniform in morphology, being the second most developed in almost all the sampled species. Premaxillary glands distinct from the supralabial glands were observed in five species (<jats:italic>Myron richardsonii<\/jats:italic>, <jats:italic>Bitia hydroides<\/jats:italic>, <jats:italic>Cantoria violacea<\/jats:italic>, <jats:italic>Fordonia leucobalia<\/jats:italic>, and <jats:italic>Gerarda prevostiana<\/jats:italic>), in addition to <jats:italic>Cerberus rynchops<\/jats:italic>, the only species in which this condition was previously documented associated with the excretion of salt. In the three species of the saltwater group of homalopsids (<jats:italic>C. violacea<\/jats:italic>, <jats:italic>F. leucobalia<\/jats:italic>, and <jats:italic>G. prevostiana<\/jats:italic>), the premaxillary glands also extend posteriorly, occupying a large area above the supralabial gland, a condition not observed in any other species of snake studied thus far. Character evolution analyses indicate that premaxillary glands differentiated from the supralabial gland and evolved independently three or four times in the family, always in lineages that invaded marine habitats. Our results suggest that the differentiated premaxillary glands are likely salt glands, as is the case in <jats:italic>C. rynchops<\/jats:italic>. If corroborated, this increases to six or seven the number of independent evolutionary origins of salt glands in snakes that have undergone an evolutionary transition to marine life.<\/jats:p>","DOI":"10.1111\/joa.14005","type":"journal-article","created":{"date-parts":[[2024,1,18]],"date-time":"2024-01-18T08:18:57Z","timestamp":1705565937000},"page":"708-721","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Comparative morphology of oral glands in snakes of the family Homalopsidae reveals substantial variation and additional independent origins of salt glands within Serpentes"],"prefix":"10.1111","volume":"244","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1768-603X","authenticated-orcid":false,"given":"Leonardo","family":"de Oliveira","sequence":"first","affiliation":[{"name":"Laborat\u00f3rio de Toxinologia Aplicada, Center of Toxins, Immune\u2010Response and Cell Signaling (CeTICS) Instituto Butantan  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