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Megalolamna
Taxonomy
Megalolamna was named by Shimada et al. (2017).
It was assigned to Otodontidae by Shimada et al. (2017), Landini et al. (2019) and Shimada et al. (2024).
It was assigned to Otodontidae by Shimada et al. (2017), Landini et al. (2019) and Shimada et al. (2024).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Megalolamna Shimada et al. |
| 2019 | Megalolamna Landini et al. p. 358 |
| 2024 | Megalolamna Shimada et al. |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Megalolamna Shimada et al. 2017
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†Megalolamna paradoxodon Shimada et al. 2017
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| K. Shimada et al. 2024 | Lamniform differing from all known species of otodontids by the following combination of characters: tooth consisting of a sharply pointed, relatively tall, triangular main cusp, one prominent pair of triangular lateral cusplets, and strongly bilobed root; main cusp erect, slightly inclined distally, or gently curved distally; lingual crown face very convex without ornamentation; labial crown face flat or subtly convex except centre of base with weak depression; height and width of each lateral cusplet nearly equal with tendency to point outward; both mesial and distal cutting edges of main cusp and lateral cusplets smooth and razor-like, and continuous from apex to base; main cusp and lateral cusplets nearly erect to gently curved lingually; concave crown base and distinct, chevron-shaped tooth neck on lingual face characterised as a bourlette covered with thin enameloid layer; pro- minent tooth neck also on labial face in tall teeth, forming rounded ledge with thin enameloid layer that grades into enameloid of main cusp and lateral cusplets; bilobed root with rounded basal tips and moderately tight basal concavity in between; root overall robust but particularly at lingual protuberance that generally exhibits one or two prominent and a few smaller nutritive foramina; root width slightly wider than total crown width; osteodentine tooth histology.
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