Table 5. Meristic data of Potamotrygon sp. (río Madre de Díos, Peru). SD = Standard deviation.
| Counts |
n |
Range |
Mean |
SD |
| Precaudal vertebrae |
5 |
27-32 |
29.4 |
1.8 |
| Caudal vertebrae |
5 |
92-103 |
98.2 |
4.3 |
| Total vertebrae |
5 |
123-132 |
127.8 |
4.1 |
| Diplospondylous vertebrae |
4 |
92-100 |
96.0 |
3.7 |
| Upper tooth rows |
4 |
36-44 |
39.5 |
3.3 |
| Lower tooth rows |
4 |
33-45 |
37.5 |
5.3 |
| Propterygial radials |
5 |
42-44 |
42.4 |
0.9 |
| Mesopterygial radials |
5 |
14-15 |
13.8 |
0.4 |
| Metapterygial radials |
5 |
34-36 |
35.0 |
1.2 |
| Total pectoral radials |
5 |
90-93 |
91.2 |
1.3 |
| Pelvic radials (male) |
5 |
21-22 |
21.2 |
0.4 |