- semi-closed petasma
- The lateral lobes are rather flexable, markedly folded, supported by strong ribs, with the ventral costae approaching rather closely, delimiting moderately large space, narrowly open distally where usually overlapped by well developed distomedian projections. See: petasma [Perez Farfante and Kensley, 1997].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.