Diversity of Mesozoic semionotiform fishes and the origin of gars (Lepisosteidae) |
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Authors: | Lionel Cavin |
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Institution: | 1. Muséum d’Histoire Naturelle, CP 6434, 1211, Geneva 6, Switzerland
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Abstract: | Gars (Lepisosteidae) are ray-finned fishes with controversial relationships to other actinopterygian lineages. When fossil
taxa are considered, gars are grouped with Mesozoic macrosemiids and ‘semionotids’ in the Semionotiformes, but the intra-relationships
within this order are still elusive. Here, the evolutionary history of gars is reinvestigated using a set of well-preserved
extinct semionotiform taxa in a phylogenetic analysis. Results indicate that the gar lineage roots in a clade of Late Jurassic–Cretaceous
semionotiform fishes. The closest relatives to gars were plant-eating and detritivorous freshwater fishes. The occurrence
of semionotiform remains in Early and early Late Cretaceous continental deposits worldwide possibly reflects an important
radiation of this group, comparable to the present-day diversification of cypriniforms. Other Late Triassic to Early Cretaceous
semionotiform taxa are gathered in a single clade with weakly supported internal nodes, pointing out the necessity to better
understand the osteology of these fishes. |
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