Table 2. Quadrate size and estimated skull length in Spinosauridae.
| Taxa | Specimen | Ontogenetic stage | Quadrate subunit | Size (mm) | Width-Height Ratio | quadrate-skull percentage | Skull (mm) |
|---|---|---|---|---|---|---|---|
| Baryonyx walkeri | NHM R.9951 (left quadrate) | Immature | Quadrate height | 181 | 0.55 | 19–20% | 910–950* |
| Mandibular articulation width | 100 | 10.5–11% | |||||
| Suchomimus tenerensis | MNN GAD 502 | Immature? | Quadrate height | 145 | 0.48 | 12.1%** | 1190* |
| Mandibular articulation width | 70 | 5.9%** | |||||
| Spinosaurus aegyptiacus (Morphotype 1) | FSAC-KK 11888 | Subadult | Quadrate height | 240 | ? | 21.4% | 1120* |
| MHNM.KK374 | Juvenile | Quadrate height | 78 | 0.46 | ? | 327–409* | |
| Mandibular articulation width | 36 | ? | |||||
| MHNM.KK375 | Subadult | Quadrate height | 145 | 0.53 | ? | 677–761* | |
| Mandibular articulation width | 77 | ? | |||||
| MHNM.KK377 | Immature | Quadrate height | 130 | 0.54 | ? | 607–682* | |
| Mandibular articulation width | 70 | ? | |||||
| MHNM.KK378 | Adult | Quadrate height | 220 | ? | ? | 1028–1154* | |
| MSNM V6896 | Immature | Quadrate height | 145 | 0.52 | ? | 677–761* | |
| Mandibular articulation width | 76 | ? | |||||
| ?Sigilmassasaurus brevicollis (Morphotype 2) | MHNM.KK376 | Mature (subadult to adult) | Quadrate height | 204* | ? | ? | 953–1070* |
| Mandibular articulation width | 108 | ? |
*Estimations.
**Considering that MNN GAD 502 (quadrate) and MNN GAD 501 (articulated premaxillae and maxillae) belong to the same individual.