{"ok":true,"nota":{"id":"3ba4d4d243a7d5cb","slug":"los-bagres-carpas-tetras-y-sus-parientes-descienden-de-una-sola-llegad-3ba4d4","titulo":"Los bagres, carpas, tetras y sus parientes descienden de una sola llegada al agua dulce","resumen":"Un análisis de fósiles y de relaciones entre especies sostiene que el grupo de peces de agua dulce más diverso del mundo viene de un solo ingreso desde el mar. Otros autores habían propuesto varias entradas independientes.","fuente":"biorxiv","fuenteNombre":"bioRxiv · preprints","color":"#be2628","autor":"Hays, D. H., Burnett, M. A., Santaquiteria, A., Arcila, D., Burnett, A., Otero, O., Mayrinck, D., Betancur-R., R.","url":"https://www.biorxiv.org/content/10.64898/2026.10.26.761952v1?rss=1","imagen":"/hoy/portada/3ba4d4d243a7d5cb","tema":"ciencia","subtemas":["peces de agua dulce","paleontología","filogenia","biodiversidad","evolución"],"entidades":["Otophysa","Sooinichthys","Santanichthys","Liu et al."],"formato":"dato","entretenimiento":false,"pubTs":"2026-10-29T00:00:00.000Z","indexTs":"2026-10-29T23:46:06.421Z","hash":"f63c4de4a975679d7fde592d355622d66cd1522310013c70300a5015a2bc9da3","tsa":{"time":"Oct 29 23:46:51 2026 GMT","provider":"freetsa.org","sobre":"sello"},"stats":{"views":0,"likes":0,"clicks":0,"dwell":0},"tipo":"normal","registro":"hallazgo","porQueImporta":"Casi la mitad de las especies de peces vertebrados de agua dulce pertenecen a este grupo, que incluye al pejerrey, los bagres y las mojarras de nuestros ríos. Saber cuándo y cómo llegaron ayuda a entender por qué tantas especies se parecen y por qué están hoy tan presionadas por represas y contaminación. Un río del Litoral guarda una historia de millones de años que se pierde si se lo degrada.","quienFirma":"Preprint en bioRxiv (institución no identificada en la fuente)","confianza":"preprint","consulta":null},"sello":{"hash":"f63c4de4a975679d7fde592d355622d66cd1522310013c70300a5015a2bc9da3","sello":"6f5a2a09d2ccb674243fa1f8703119335f853bc33c04f27a9b1ae557a1a9bf57","beacon":{"drand":{"cadena":"8990e7a9aaed2ffed73dbd7092123d6f289930540d7651336225dc172e51b2ce","ronda":6596219,"aleatorio":"d7607553a52033d91a72c90ee750a3a506f07cd72d1c29249334c16fad15c4ec","tiempo":"2026-10-29T23:46:30.000Z"},"nist":{"cadena":2,"pulso":2005043,"salida":"2DA44EF607F4EAF5C58160E82A595D10AD36CF1B3B55F6509A1B95B5EF1CD1690FB74F1F5980488256CB2ED5BD60A1EC62CA16516061E7C875D4E8C41361740B","tiempo":"2026-10-29T23:45:00.000Z"},"noAntes":"2026-10-29T23:46:30.000Z"},"verificacion":{"drand":true,"nist":true},"tsa":{"time":"Oct 29 23:46:51 2026 GMT","provider":"freetsa.org","sobre":"sello"},"original":{"titulo":"A single freshwater invasion gave rise to the world's dominant freshwater fish group","descripcion":"The ultraspeciose clade Otophysa - catfishes, carps, minnows, tetras, and their kin - accounts for most vertebrate diversity in modern freshwater ecosystems. However, a controversial assemblage of largely-fragmentary marine fossils has led some authors, most recently Liu et al., to advocate parallel freshwater invasions for this otherwise inland lineage. Here, we test this hypothesis under multiple sources of uncertainty. We provide the first phylogenetic analysis of the recently-named marine fossil genus Sooinichthys, resolving it as sister to all modern otophysans. We also find that Santanichthys, long treated as an early marine otophysan, lacks a Weberian apparatus and plausibly belongs o","pubDate":"2026-10-29","url":"https://www.biorxiv.org/content/10.64898/2026.10.26.761952v1?rss=1"},"indexado":"2026-10-29T23:46:06.421Z"}}