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Showing results for tags 'ptychodus atcoensis'.
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From the album: Texas Cretaceous Fossils : Sharks and Rays
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- atco formation
- cretaceous
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From the album: Post Oak Creek
P. atcoensis was a rare species of durophagous shark that lived during the Late Cretaceous. Its contemporary P. whipplei was far more abundant and tended to have a higher, bullet-shaped crown; this disparity in morpholgy suggests they may have preyed on different things. From Shawn Hamm's thesis: "Diagnosis. Tooth Crown high and rounded, oriented 90° to the margin area in the medial files; crown crossed by six to eight thick, chevron-shaped parallel ridges; lateral files have moderately high crowns with four to five parallel ridges; posterior teeth are low crowned with two to three ridges; differs from other species as the ridges are thick, chevron shaped and terminate sharply at a coarsely granular and concentric margin."-
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- post oak creek
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From the album: Post Oak Creek
P. atcoensis was a rare species of durophagous shark that lived during the Late Cretaceous. Its contemporary P. whipplei was far more abundant and tended to have a higher, bullet-shaped crown; this disparity in morpholgy suggests they may have preyed on different things. From Shawn Hamm's thesis: "Diagnosis. Tooth Crown high and rounded, oriented 90° to the margin area in the medial files; crown crossed by six to eight thick, chevron-shaped parallel ridges; lateral files have moderately high crowns with four to five parallel ridges; posterior teeth are low crowned with two to three ridges; differs from other species as the ridges are thick, chevron shaped and terminate sharply at a coarsely granular and concentric margin."-
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- poc
- post oak creek
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From the album: Austin Chalk
Ptychodus atcoensis, Travis Co. Coniacian, Cretaceous Nov, 2021 Can be identified by the characteristic chevron ridge pattern. Actually my first ever ptychodus. Took me a long time to figure out what it was since atcoensis is a rarer species. As a beginner, it turned me off of pinning down ptychodus species since I worried they might all be as difficult!