cervical groove

From ZooTerms (Dictionary of Invertebrate Zoology)
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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.