Table 3. Comparison of cranial features within the genus Torvoneustes.
| Skull ornamentation | Frontal | Distinct angle at the frontal-prefrontal-nasal contact |
Tooth count per maxilla (estimated) |
Teeth morphology | False serration | Denticles size | Denticles density (#denticules/5 mm) | |
|---|---|---|---|---|---|---|---|---|
|
Torvoneustes carpenteri
(Grange & Benton, 1996; Wilkinson, Young & Benton, 2008) |
Smooth with ornamentation on the maxillae |
Does not reach the anterior end of the prefrontal |
No | 14 | Robust, blunt apex | Yes | Irregular in size. BS: 120–220 µm |
– |
|
Torvoneustes coryphaeus (Young et al., 2013b) |
Ornamented | Reach the anterior end of the prefrontal |
No | 17–19 | Robust, blunt apex | No | – | – |
|
Torvoneustes mexicanus (Barrientos-Lara et al., 2016) |
– | – | – | – | Slender, sharp apex | Yes | Regular in size. BS: 142 µm |
30 |
| Torvoneustes jurensis sp. nov. | Smooth | Reach the anterior end of the prefrontal |
Yes | Up to 18 | Slender, sharp apex | Yes | Irregular in size. BS: 120–200 µm |
30–40 |
Note:
Comparative table of currently named species of Torvoneustes and their diagnostic cranial features identified in To. jurensis. False serration definition and denticle density methodology follow Andrade et al. (2010) (see description for more details). BS, Base length.