| Term | Definition |
| CHEVRON (GROOVE) | V-shaped furrow on cardinal area in some Arctacea and early Pectinacea, for insertion of the LIGAMENT. | |
| GROOVE |
A distinct furrow, depression, channel, or hollow cut occurring on the surface as opposed to a thin, shallow scratch (e.g., a STRIA); see also:
FISSURE;
SCROBICULATE;
SULCATE;
SPIRAL GROOVE. Photo by Marlo F. Krisberg; Nerita fulgurans Gmelin, 1791. |
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| LIGAMENT GROOVE | Narrow depression in CARDINAL AREA for attachment of fibers of the LIGAMENT. | |
| PEDAL GROOVE |
A longitudinal groove in the body of a snail that marks the boundary where the TUBERCULATE side wall of the foot joins the smooth ventral sole; see also: SUPRAPEDAL GROOVE. In the neomeniomorph (Solenogastres) APLACOPHORANS, a longitudinal narrow groove which functions as a foot, beginning anteriorly in a PEDAL PIT. See the WHOI website for a photo by Amelie Scheltema. |
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| PERIOSTRACAL GROOVE | [need definition]. | |
| SPIRAL GROOVE |
A GROOVE that encircles the spire of a shell. Revolving grooves going in the direction of the turning of the whorls. Coarser than a
SPIRAL THREAD. Photo by Marlo F. Krisberg; Echinolittorina riisei (Mörch, 1876). |
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| SUPRAPEDAL GROOVE | A groove above, and running parallel to, the PEDAL GROOVE in certain snails. | |