Relatively large, unpaired region of carapace overlying stomach. May be variously subdivided (from anterior to posterior) into paired epigastric and protogastric as well as unpaired mesogastric, metagastric and urogastric regions or areas. Adjoined anteriorly by frontal region, posteriorly by cardiac region.
(M. Stachowitsch, 1992)

Alternative form for gastric region : gastric.