The root-feeding larvae of the cockchafer and allied members of the Scarabaeidae have a ridged area on the mandible, which is scraped by teeth on the maxillae, apparently forming a stridulating organ.
Sheets of mica which have been subjected to earth-movements are frequently cracked and ridged parallel to these directions, and are then valueless for economic purposes.
This was then cooked on a ridged griddle pan over a medium to low heat for about four minutes on each side.
Do n't get too smooth a surface - a finish ridged by the file looks more realistic.
His chest was wide and sprinkled with dark hairs that trailed his ridged belly and disappeared into the dark pants.