submentumn.
/sʌbˈmɛntəm/, U.S. /ˌsəbˈmɛn(t)əm/ Entomology.
In certain insects: the basal part of the labium. Cf. mentum n. 2.
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the world > animals > invertebrates > phylum Arthropoda > class Insecta > parts of insects > [noun] > head > mouth-parts or trophi > part of labium > basal part or plate supporting
gula1826
submentum1839
1839 G. Newport in Todd's Cycl. Anat. & Physiol. II. 899/1 The sub-mentum (m) is articulated by a single joint with the united extremities of the two cardines.
1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 141 The labium..consists (1) of a large basal sub-mentum..(2) a mentum; (3) of two three-jointed palpi..(4) a ligula.
1902 H. S. Pratt Course in Invertebr. Zool. i. 11 Remove the labium..mount it on a slide, and identify the following parts: the basal segment or submentum, by means of which the labium articulates with the head; [etc.].
1936 Proc. Acad. Nat. Sci. Philadelphia 1935 87 461 Both of these suborders differ from the Forficulina by having..the submentum decreased in size.
2005 Coleopterists Bull. 59 508 Mentum with prominent, bifid tooth; submentum with 1 long seta and 1 short seta on each side.
This entry has been updated (OED Third Edition, June 2012; most recently modified version published online June 2022).
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n.1839