CERVICAL SULCUS
Groove or series of grooves sometimes present on carapace; mesially transverse, laterally oblique, and separates gastric and hepatic regions from cardiac and branchial regions. (Syn. (or groove)) [Butler, T.H.].
Mesially transverse and laterally oblique groove of the carapace extending from the anterior limit of the hepatic region towards the midline of the carapace (Fig. 2B) [Perez Farfante and Kensley, 1997].
(Order Mysida):
Transverse groove across anterior region of carapace at level of mandibles. (Syn. cervical groove) [Stachowitsch, 1992].