oral groove


Also found in: Medical.

oral groove

[′ȯr·əl ¦grüv]
(invertebrate zoology)
A depressed, groovelike peristome.
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References in periodicals archive ?
5A) merges into a prominent nerve nodule positioned near the elongate ciliated oral groove present in this species.
Although the superficial mucous string is drawn between the palp lamella at their distal apices, the superficial groove extends the entire length of the inner demibranch, ending at the oral groove between the palp pair.
The arrangement of the ctenidium/palp junction suggests that material within the marginal groove proper may be transported to the anterior portion of the labial palps or directly to the oral groove. The differing degree to which the two mucous strings are processed by the palps suggests that the material in the superficial mucous string is of lower quality than that in the groove string.