(Order Amphipoda):
One in a series of spinose and setose ridges surrounding border between esophagus and stomach [Stachowitsch, 1992].
(Order Isopoda):
One of two spinose or setose internal ridges on each side of foregut. Serves in crushing food [Stachowitsch, 1992].
(Order Stomatopoda):
In digestive tract, diverticulum at junction of posterior (pyloric) stomach, digestive ceca, and midgut. (Syn. pars ampullaris) [Stachowitsch, 1992].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.