BONY FISHES (OSTEICHTHYES) FROM THE SINEMURIAN (JURASSIC) OSTENO KONSERVAT-LAGERSTÄTTE (COMO, NW ITALY)
DOI:
https://doi.org/10.54103/2039-4942/29058Keywords:
Lombardy basin; Actinistia; Actinopterygii; Ostenolepis marianii gen. n.. et sp.; Peripeltopleurus jurassicus sp. n.; Pholidolepis teruzzii sp. n..Abstract
Located in the Lombardy Basin of Northern Italy, the Osteno Konservat-Lagerstätte preserves an exceptionally diverse Lower Jurassic marine assemblage that, despite yielding extraordinary amounts of data over the past 60 years due to the remarkable preservation of its specimens, has long had its vertebrate component largely overlooked. This study presents a detailed morphological and taxonomic analysis of the bony fish fauna recovered from this unique deposit. Seven distinct taxa have been identified, four of which are shared with the renowned Lyme Regis Lagerstätte (Dorset, UK): Holophagus cf. gulo, Dapedium sp., Furo sp., and Dorsetichthys bechei, a unique stem teleost whose occurrence at Osteno further strengthens the possibility of faunal contact between English and northern Italian Sinemurian communities. Three novelties characterize the Osteno ichthyofauna: Ostenolepis marianii n. gen. et sp., a small palaeoniscimorph with finely ornamented scales; Peripeltopleurus jurassicus n. sp., the last representative of the Peltopleuriformes, an order previously restricted to the Middle and Upper Triassic; and Pholidolepis teruzzii n. sp., a stem-teleost related to Pholidolepis dorsentensis from Lyme Regis, but uniquely lacking any scale covering. The discovery of these taxa significantly contributes to our understanding of Sinemurian ichthyofaunas while shedding new light on the paleoenvironmental dynamics along the northwestern margin of the Neotethys. Overall, this study underscores the critical importance of the Osteno site for reconstructing patterns of diversity and biogeographic connectivity during a pivotal interval in vertebrate evolution.
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