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Until this work, <jats:italic>Tridens<\/jats:italic> was a monotypic genus composed solely of <jats:italic>Tridens melanops<\/jats:italic>, from the Putumayo\/I\u00e7\u00e1 River drainage, upper Amazonas River basin. <jats:italic>Tridens vitreus<\/jats:italic> sp.n. is known from upper and middle Madeira River drainage and differs from all other congeners by the lack of pelvic fins and girdle and by vertebra and dorsal\u2010fin ray counts. <jats:italic>Tridens chicomendesi<\/jats:italic> sp.n. is known from Abun\u00e3 River, middle Madeira River drainage and is distinguished from all other congeners by the number of vertebrae, dorsal\u2010fin ray count and anal\u2010fin base colouration pattern. <jats:italic>Tr. chicomendesi<\/jats:italic> sp.n. is further distinguished from <jats:italic>T. vitreus<\/jats:italic> by a combination of character states regarding the position of urogenital opening, dorsal\u2010fin position, anal\u2010fin position, maxillary barbel length, number of premaxillary teeth, number of dorsal\u2010fin rays, number of anal\u2010fin rays, number of lateral\u2010line system pores, frontal bone anatomy, degree of ossification of maxilla, anatomy of quadrate\u2010hyomandibular joint, size of posterodorsal process of hyomandibula, length of opercular patch of odontodes, number of interopercular odontodes, proportion of upper hypural plate cartilage relative to its area ; by the absence of a proximal, distal and ventral cartilages on ventral hypohyal; by the absence of a lateral process on basibranchial 4; by the presence of a cartilage block on the lateral process of autopalatine, the presence of a well\u2010developed ossification on proximal margin of ventral hypohyal, the presence of hypobranchial foramen; and by the presence of an anterior cartilaginous joint between quadrate and base of posterodorsal process of hyomandibula. This work represents the first species description for the subfamily Tridentinae in more than 30\u2009years and for the genus <jats:italic>Tridens<\/jats:italic> since its original description in 1889.<\/jats:p>","DOI":"10.1111\/jfb.15403","type":"journal-article","created":{"date-parts":[[2023,5,16]],"date-time":"2023-05-16T04:55:37Z","timestamp":1684212937000},"page":"155-171","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Two new miniature translucent catfish species of the rare genus <scp><i>Tridens<\/i><\/scp> (Siluriformes: Trichomycteridae) from the <scp>Madeira River<\/scp> basin, northern Brazil"],"prefix":"10.1111","volume":"103","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5507-7396","authenticated-orcid":false,"given":"Elisabeth","family":"Henschel","sequence":"first","affiliation":[{"name":"Laboratory of Systematics and Evolution of Teleost Fishes Institute of Biology Federal University of Rio de Janeiro  Rio de Janeiro Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Willian M.","family":"Ohara","sequence":"additional","affiliation":[{"name":"Laboratory of Zoology Institute of Biology Federal University of Amazonas, Avenida General Rodrigo Ot\u00e1vio  Manaus Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wilson J.E.M.","family":"Costa","sequence":"additional","affiliation":[{"name":"Laboratory of Systematics and Evolution of Teleost Fishes Institute of Biology Federal University of Rio de Janeiro  Rio de Janeiro Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,5,15]]},"reference":[{"issue":"7","key":"e_1_2_8_2_1","first-page":"36","article-title":"Image processing with ImageJ","volume":"11","author":"Abr\u00e0moff M. 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