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Deciduous lower premolars (milk teeth) of the Eocene artiodactyl family Cebochoeridae possess accessory denticles and are
remarkably similar to both deciduous and adult teeth of the cetacean family Basilosauridae, suggesting that morphological
characters of juvenile dentitions are important to understanding the phylogenetic origin of whales and morphological transitions
in the cetartiodactyl lineage. Incorporation of these new characters into a larger phylogenetic analysis of morphological
characters of artiodactyls, mesonychids, and basal and recent whales supports a monophyletic Cetartiodactyla, but does not
directly support a whale–hippo relationship. However, the presence of accessory denticles on some artiodactyl dentitions weakens
the morphological support for a monophyletic Artiodactyla, suggesting either that whales and cebochoerids may be more closely
related than had been thought, or that cebochoerids share a developmental pathway with cetaceans. 相似文献
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