Space beneath thorax (e.g., phyllocarids) enclosed by ventral body wall and rhythmically moved thoracopods which functions for food-gathering from currents sucked into it [Moore and McCormick, 1969].
Space beneath thorax enclosed by ventral body wall and moving thoracopods used for foodgathering [McLaughlin, 1980].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.