| This section of the colon is lined with rugae precisely like those which are found in the caecum. |
| Frontoclypeus with transverse rugae with distinct carina on in middle. |
| The large elongated conical monopleurid, Petalodontiafelixi, has an exterior marked by strong foliaceous growth rugae and indistinct longitudinal ribs. |
| Once the liquid was in her mouth, they saw that it was held in ridges called rugae on the roof of the mouth before it continued down her throat. |
| Palatal rugae are located in the most anterior area of the hard palate. |
