After a light breakfast I studied a draft of a paper that we had just submitted on the new fossil crossopterygian fishes of the Aztec Siltstone. |
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Large Bothriolepis plates were scattered around through the rocks with abundant crossopterygian bones and scales in the top units. |
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One consequence was that the crossopterygian fishes were dethroned from their privileged position as ancestors. |
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Already some years ago it was pointed out that the skeleton of the pelvic fin and girdle of Polypterus is much more actinopterygian than crossopterygian in structure. |
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