Journal
PALAEOBIODIVERSITY AND PALAEOENVIRONMENTS
Volume 103, Issue 3, Pages 489-494Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s12549-023-00572-4
Keywords
Eupolypods I; Dryopteridaceae; Cenomanian; New genus; Fossil
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This article reports a new genus of Dryopteridaceae based on a well-preserved fertile specimen frond in mid-Cretaceous Kachin amber, representing the first fossil record of Dryopteridaceae from the Mesozoic. The age of this fossil is consistent with molecular-based estimates of divergence time, and it expands our understanding of polypod fern diversity in Mesozoic forests.
Dryopteridaceae are the basal family of Eupolypods I (Polypodiales) and include abundant extant species, but fossil occurrences are limited, particularly from a temporal perspective. Although DNA-based molecular studies indicate that the origin of Dryopteridaceae dates to the Early Cretaceous, no unambiguous fossil of the family has been reported from the Cretaceous period. Here, we report a new fern taxa based on well-preserved fertile specimen frond from mid-Cretaceous Kachin amber. Based on sporangia with interrupted, vertical annulae; monoletee spores; and the absence of indusia, the fertile fern fossil has been assigned to a new genus of Dryopteridaceae (Polypodiales). This represents the first fossil record of Dryopteridaceae from the Mesozoic and its mid-Cretaceous age is largely consistent with molecular-based estimates of divergence time. The fossil extends our understanding of polypod fern diversity in Mesozoic forests.
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