A row of spine on the medial side of the mandible's incisor process. The lacinia mobilis on the left mandible is actually an enlarged member of the spine row [Wilson, 1989].
(Order Tanaidacea):
In mandible, row of spine-like projections between molar process and lacinia mobilis (or between molar and incisor processes when lacinia mobilis is absent) [Stachowitsch, 1992].
(Order Amphipoda):
Setal row [Stachowitsch, 1992].
(Order Isopoda):
Row of spines situated between the incisor and molar processes of the mandible [Kensley and Schotte, 1989].
(Order Mysida):
Row of spine-like projections in central postition on cutting edge of either mandible [Stachowitsch, 1992].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.