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Sawfish (Ischyrhiza cf. avonicola)

Age – Late Cretaceous; Commonality – Scarce (?); Size – Rostrals: ¼-½ inch, Oral teeth: likely smaller than that of I. mira

This Sawfish is a bit ambiguous. Its rostrals resemble the posterior rostrals of I. mira; however, there are a couple differences. The whole rostral is shorter and stouter, the crown curves in a distinct fashion, and the root has an overall different shape.

I don’t think any oral teeth were reported from this Sawfish. They may be similar to that of I. mira.

Rostral Spines

Ventral View

Dorsal View

Sawfish (Ischyrhiza avonicola) Rostral spine, Cretaceous, New Jerse

Anterior View

Posterior View

Basal View

Occlusal View

A nice rostral. Note the twist in the root, the exaggerated root ridges, and the disproportionally small crown. EDIT – this is actually an I. mira posterior rostral.

Dorsal View

Ventral View

Anterior View

Posterior View

Basal View

Occlusal View

This is a typical rostral with the usual wear.

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