bourrelet
From ZooTerms (Dictionary of Invertebrate Zoology)
bourrelet (noun; French bourrelet, circular pad): 1. A ridgelike prominence or rounded edge. 1. (Arthropoda: Insecta) see parameres.
2. (Echinodermata) A raised prominence on the interambulacral plates at the edge of the mouth.
3. (Mollusca: Bivalvia) A ligamental area anterior and posterior to the resilifer.
