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'''Abstract''' - The Paleocene Paskapoo Formation in Alberta, Canada, offers a unique opportunity to gain insight into insect diversity at that time. This fossil insect-rich formation has yielded a variety of fossil arthropod specimens, including several wings of ''[[Odonata]]'' related to the genus ''Alloaeschna'' Wighton and Wilson, 1986. Here, we demonstrate that morphological characters previously used to separate three species are instead the result of intraspecific variability. We reinforce this demonstration using two examples of high variability and plasticity in modern species of the family ''[[Aeshnidae]]''. Accordingly, we reinterpreted the taxonomic position of ''Alloaeschna marklae'' Wighton and Wilson, 1986 syn. nov. and ''Alloaeschna quadrata'' Wighton and Wilson, 1986 syn. nov. as junior synonyms of ''Alloaeschna paskapooensis'' Wighton and Wilson, 1986. In addition, we describe the first occurrence of a zygopteran in the Paskapoo Formation, namely ''Albertalestes paskapooensis'' gen. et sp. nov. (''[[Synlestidae]]''). Importantly, this new taxon is the first representative of the family found in North America. We also reconstructed the relationships within the ''[[Synlestidae]]'' under Bayesian inferences with a newly assembled matrix. Finally, we discuss the biogeography of the clade considering its fossil record using parsimony ancestral state reconstruction. | |||
Version du 16 décembre 2023 à 00:43
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Demoiselles et Libellules du Monde entier
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 14 636 articles
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Jouault C. & al. 2023 - New odonatans (Odonata : Gomphaeschnidae ; Synlestidae) from the Paleocene Paskapoo Formation: systematic and biogeographical implications. - J. of Systematic Paleontology, 21 (1).
Résumé (traduction libre)
Abstract - The Paleocene Paskapoo Formation in Alberta, Canada, offers a unique opportunity to gain insight into insect diversity at that time. This fossil insect-rich formation has yielded a variety of fossil arthropod specimens, including several wings of Odonata related to the genus Alloaeschna Wighton and Wilson, 1986. Here, we demonstrate that morphological characters previously used to separate three species are instead the result of intraspecific variability. We reinforce this demonstration using two examples of high variability and plasticity in modern species of the family Aeshnidae. Accordingly, we reinterpreted the taxonomic position of Alloaeschna marklae Wighton and Wilson, 1986 syn. nov. and Alloaeschna quadrata Wighton and Wilson, 1986 syn. nov. as junior synonyms of Alloaeschna paskapooensis Wighton and Wilson, 1986. In addition, we describe the first occurrence of a zygopteran in the Paskapoo Formation, namely Albertalestes paskapooensis gen. et sp. nov. (Synlestidae). Importantly, this new taxon is the first representative of the family found in North America. We also reconstructed the relationships within the Synlestidae under Bayesian inferences with a newly assembled matrix. Finally, we discuss the biogeography of the clade considering its fossil record using parsimony ancestral state reconstruction.
