{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T10:19:20Z","timestamp":1786702760556,"version":"build-2736575974"},"reference-count":98,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2025,10,17]],"date-time":"2025-10-17T00:00:00Z","timestamp":1760659200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Science and Technology Council, Taiwan","award":["Grant No. 112-2116-M-001-017-MY3"],"award-info":[{"award-number":["Grant No. 112-2116-M-001-017-MY3"]}]},{"name":"Academia Sinica, Taipei, Taiwan","award":["AS-CDA-114-L04"],"award-info":[{"award-number":["AS-CDA-114-L04"]}]},{"name":"Smithsonian Tropical Research Institute and the National Science Foundation","award":["EAR-2347773"],"award-info":[{"award-number":["EAR-2347773"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>Marine fossils from the Upper Miocene Chagres Formation in northern Panama offer critical insights into the paleoenvironmental conditions and ecological responses prior to the separation of the Atlantic from the Pacific by the formation of the Isthmus of Panama. Here we present a systematic study based on more than 6,200 otoliths collected from a coastal exposure near the town of Pi\u00f1a, Col\u00f3n. This assemblage is remarkable for the extraordinary dominance of the family Myctophidae, constituting over 96% of specimens. The otolith density in the sediments is among the richest known globally (278.80\u00a0\u00b1\u00a0135.59 otoliths\/kg). The taxonomic composition is represented by 31 taxa across 12 families, including four new species: namely <jats:italic>Chiloconger aflorens<\/jats:italic> sp. nov., <jats:italic>Dasyscopelus inopinatus<\/jats:italic> sp. nov., <jats:italic>Hoplostethus boyae<\/jats:italic> sp. nov., and <jats:italic>Malakichthys schwarzhansi<\/jats:italic> sp. nov. Taphonomic evidence, combined with abundant predatory marine vertebrate fossils and extensive burrow ichnofossils, indicates a dynamic and highly productive nearshore ecosystem. The dominance of myctophids and multiple lines of evidence support the existence of a Late Miocene coastal upwelling system in the region, highlighted by efficient trophic transfer channeled from high primary production to apex predators. These findings provide a nuanced understanding of Neogene marine ecosystems prior to the final emergence of the Isthmus of Panama.<\/jats:p>","DOI":"10.7717\/peerj.20155","type":"journal-article","created":{"date-parts":[[2025,10,17]],"date-time":"2025-10-17T08:15:28Z","timestamp":1760688928000},"page":"e20155","source":"Crossref","is-referenced-by-count":1,"title":["Remarkable dominance of myctophid otoliths in Upper Miocene Chagres Formation, Caribbean Panama"],"prefix":"10.7717","volume":"13","author":[{"given":"Chien-Hsiang","family":"Lin","sequence":"first","affiliation":[{"name":"Biodiversity Research Center, Academia Sinica, Taipei, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aaron","family":"O\u2019Dea","sequence":"additional","affiliation":[{"name":"Smithsonian Tropical Research Institute, Panama City, Panama"},{"name":"Sistema Nacional de Investigaci\u00f3n, Panama City, Panama"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"4443","published-online":{"date-parts":[[2025,10,17]]},"reference":[{"key":"10.7717\/peerj.20155\/ref-1","doi-asserted-by":"publisher","first-page":"154","DOI":"10.1017\/pab.2021.30","article-title":"The taphonomic clock in fish otoliths","volume":"48","author":"Agiadi","year":"2022","journal-title":"Paleobiology"},{"key":"10.7717\/peerj.20155\/ref-2","doi-asserted-by":"publisher","first-page":"53","DOI":"10.1186\/s13358-025-00391-4","article-title":"Fossil deep-sea snapper (Actinopterygii: Lutjanidae) from the Last Interoceanic Central American Deep Strait (LICADS)","volume":"144","author":"Aguilera","year":"2025","journal-title":"Swiss Journal of Palaeontology"},{"key":"10.7717\/peerj.20155\/ref-3","first-page":"251","article-title":"Bathymetric distribution of Miocene to Pleistocene Caribbean teleostean fishes from the coast of Panama and Costa 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