Table 1 Cranial measurements of (Crocodylus niloticus) from lake Nasser, measurements illustrated in (Fig. 11) and specimens included in this study. All measurements in cm; missing measurements indicated by “–”.
Specimen number | NHMUK R 3322 | YPM VP-058532 C. megarhinus (14) | CGM 84425 | FARB AMNH 5061 (28) | NHMUK PVR14154 R. lloydi | CGM67155 R. lloydi (28) | DPC6610 R. lloydi (28) | DPC6646 R. lloydi (28) | CGM67156 Indeterminate genus (28) | CUWM90 Indeterminate genus (28) | CUVP001 C. niloticus |
|---|---|---|---|---|---|---|---|---|---|---|---|
A-Head length (anterior border premaxilla to posterior margin supraoccipital) | – | 34 | 37.63 | – | 69.5 | – | – | – | – | – | 29.7 |
B-Greatest lateral length of skull (anterior margin of premaxilla to posterior margin of quadrate) | – | 35.87 | 40.39 | – | 74.45 | – | – | – | – | – | 31.4 |
C-Snout length (anterior edge of orbits to anterior margin of premaxilla) | 35.29 | 19.25 | 22.76 | – | 45.4 | – | – | – | – | – | 19 |
D-Dorsal length of premaxilla (measured on dorsal surface of skull) | 10.5 | 7.94 | 9.07 | – | 16.75 | – | – | – | – | 10.1 | 8.66 |
E-Length of external naris | 3.19 | 3.25 | 3.42 | – | 7.45 | 10.7 | 7.08 | – | – | – | 3.38 |
F-Maximum breadth of the external naris | 2.9 | 3.22 | 3.39 | – | 8 | 11.4 | 7.85 | – | – | – | 2.5 |
G-Smallest breadth of snout (breadth on junction of maxilla and premaxilla) | 5 | 4.75 | 6.13 | – | 12 | – | – | – | – | 8.1 | 3.88 |
H-Breadth of snout at fifth maxillary tooth | 8.2 | 7.97 | 10.92 | – | 26 | – | – | – | – | 11.3 | 6.77 |
J-Breadth of snout at anterior edge of orbits | 13.82 | 11.75 | 14.73 | – | 29 | – | – | – | – | – | 9.14 |
K-Breadth at anterior edge of cranial roof (at postorbitals) | – | 9 | 8.94 | – | 14.4 | – | – | 10.674 | 15.598 | – | 6.57 |
L-The breadth of bar between two supratemporal fenestrae | – | 2 | 2.1 | 2.4 | 1 | – | – | 1.3 | 2.3 | – | 0.3 |
M-Greatest breadth at posterior edge of cranial roof (at squamosal protuberances) | – | 10.25 | 10.52 | – | 17.95 | – | – | 12.022 | 16.713 | – | 7.1 |
N-Greatest posterior breadth of skull at quadratojugals | – | 18.225 | 22.63 | – | 41 | – | – | – | – | – | 14.14 |
O-The width of the triangular wedge of supraoccipital from dorsal view | – | 2.75 | 1.5 | – | – | – | – | 1.7 | 1.6 | – | 0.77 |
P-The angle made by the intersection of a line parallel to the skull table lateral margin and sagittal plane | – | 9° | 9° | – | 12° | – | – | – | – | – | 7° |
Q-The supraoccipital length from occipital view | – | 1.5 | – | – | – | – | – | – | 2.08 | – | 1.15 |
R-Width of the foramen magnum | – | 1.87 | – | – | – | – | – | – | 3.1 | – | 1.7 |
S-Length of the foramen magnum | – | 0.87 | – | – | – | – | – | – | 1.7 | – | 1.4 |
T-The distance of the exoccipital separate between supraoccipital and foramen magnum | – | 0.46 | – | – | – | – | – | – | 0.5 | – | 1.2 |
