cervical groove
From ZooTerms (Dictionary of Invertebrate Zoology)
cervical groove: 1. (Arthropoda: Crustacea) In Decapoda, a transverse groove on the carapace marking the general separation of the head and thoracic areas.
2. (NEMATA) Transverse groove on the ventral surface, or completely encircling the cervical (=cephalic) region marking the line of separation of the lip region from the rest of the body.
