gnathobasen.
/ˈneɪθəʊbeɪs/ Zoology.
A process developed from the lower part of a segmented limb in certain arthropods, modified to bite or crush food.
ΘΚΠ
the world > animals > invertebrates > phylum Arthropoda > [noun] > member of > parts of > mouth-like appendage
maxilla1798
foot-jaw1828
maxilliped1846
masticatory foot1852
mouth organ1863
gnathite1870
jaw-foot1871
gnathobase1881
jaw-process1881
malipede1883
1881 E. R. Lankester in Q. Jrnl. Microsc. Sci. Apr. 348 Of the six endites the proximal is somewhat isolated and pushed towards the middle line... It is a jaw process, and may be spoken of as the ‘gnathobase’.
1932 L. A. Borradaile & F. A. Potts Invertebrata x. 274 Some of the evidence suggests an archetype [arthropod] with a nine-segmented axis bearing on the median side of the first segment a biting process (gnathobase).
1964 New Scientist 13 Aug. 365/2 The mandibles themselves may either derive from the basal part of a segmented limb (the gnathobase) or from a whole jointed limb.
Derivatives
gnathoˈbasic adj.
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1902 E. R. Lankester in Encycl. Brit. XXV. 695/1 The five pairs of appendages of the post-oral somites of the head or prosoma thus constituted all primitively carry gnathobasic projections on their coxal joints, which act as hemignaths; in the more specialized forms the mandibular gnathobases cease to develop.
1904 W. T. Calman in Ann. & Mag. Nat. Hist. Feb. 155 The double series of epipodial lamellæ, the segmentation of the thoracic limbs, the double gnathobasic lobes of the first pair.
This entry has not yet been fully updated (first published 1933; most recently modified version published online June 2018).
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n.1881