Protacrodus sp.

Ginter, Michał & Sun, Yuanlin, 2007, Chondrichthyan remains from the Lower Carboniferous of Muhua, southern China, Acta Palaeontologica Polonica 52 (4), pp. 705-727 : 712

publication ID

https://doi.org/ 10.5281/zenodo.13741212

persistent identifier

https://treatment.plazi.org/id/954A87EC-2C1E-3360-FF80-FD2D7A227C35

treatment provided by

Felipe

scientific name

Protacrodus sp.
status

 

Protacrodus sp.

Fig. 4A, B.

Material.—Four teeth.

Description. —These protacrodont teeth are characterised by a pentacuspid crown with a prominent, labio−lingually compressed median cusp, about twice as high as the lateral cusps ( Fig. 4B 3 View Fig ) or a little less ( Fig. 4A 3 View Fig ). All the lateral cusps may either be equal to each other or the outermost are the largest. All the cusps are rounded in both the labial and lingual views and ornamented on both sides with two generations of cristae: the outer, concentric and parallel to the cusps margins and the inner, more vertical ones, often branching basally. The base is perforated by a single large nutritive canal whose openings are situated submedially on the lingual and basolabial faces. It is uncertain whether the other, minute foramina particularly visible in Fig. 4B 1 View Fig were open on the surface before fossilisation.

In the rounded shape of the cusps and the form of cristae, Protacrodus sp. is similar to P. aequalis Ivanov, 1996 , but the crown of the latter is characterised by only three cusps of virtually the same size.

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