What does this research mean for the field?

Laimosemion laranja is a newly identified, distinct species of killifish from the Brazilian Amazon, characterized by unique morphological traits and a 5.3% genetic divergence from its closest relatives. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

Describe and classify a newly discovered killifish species, Laimosemion laranja, from the lower Rio Amazonas Basin using morphological and molecular evidence.

August 23, 2026ZooKeysOpen Access

A new killifish of the genus Laimosemion (Cyprinodontiformes, Rivulidae) from Rio Cajari in the Brazilian Amazon

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Authors

YAYuri Gomes AbrantesUniversidade Federal do Rio Grande do Norte SLSergio Maia Queiroz LimaUniversidade Federal de Lavras DNDalton Tavares Bressane NielsenUniversidade Federal da Paraíba

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Implication

Taxonomic analysis reveals a new rivulid killifish species in the Brazilian Amazon, highlighting distinct morphological features and genetic divergence.

Key Points

Describe and classify a newly discovered killifish species, Laimosemion laranja, from the lower Rio Amazonas Basin using morphological and molecular evidence.
Conducted detailed morphological, meristic, and osteological comparisons, including scale series, vertebral counts, fin-ray positions, and infraorbital neuromast counts.
Sequenced partial mitochondrial cytochrome c oxidase subunit I (cox1) gene fragments to evaluate phylogenetic divergence across the Laimosemion geayi species group.
Evaluated conservation status and threats using International Union for Conservation of Nature (IUCN) criteria.
Laimosemion laranja sp. nov. is diagnosed by unique flank coloration (anterior spot rows and posterior chevron bars), dorsal-fin origin alignment, frontal squamation, and caudal fin osteology.
Mitochondrial cox1 sequence analysis revealed genetic divergences of 5.3% from L. agilae and L. strigatus, 9.2% from L. dibaphus, and 12.3% from L. geayi.

Cite This Study

Abrantes et al. (2026) studied this question.

synapsesocial.com/papers/6a8aad667677a341144457e1 https://doi.org/10.3897/zse.102.187659

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Implication

Taxonomic analysis reveals a new rivulid killifish species in the Brazilian Amazon, highlighting distinct morphological features and genetic divergence.

A new killifish of the genus Laimosemion (Cyprinodontiformes, Rivulidae) from Rio Cajari in the Brazilian Amazon

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Implication

Key Points

Cite This Study

A new killifish of the genus Laimosemion (Cyprinodontiformes, Rivulidae) from Rio Cajari in the Brazilian Amazon

Discussion

Member takes

Implication

Key Points

Cite This Study

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