mesostylen.
/ˈmɛsə(ʊ)ˌstʌɪl/, U.S. /ˈmɛzəˌstaɪl/; see also meso- comb. form. Chiefly Palaeontology.
A vertical ridge on the buccal side of a mammalian upper molar tooth, between the front and rear cusps.
ΘΚΠ
the world > animals > mammals > [noun] > parts of > (parts of) teeth
heel1833
metacone1888
metaconid1888
metaconule1888
paracone1888
paraconid1888
protocone1888
protoconid1888
protoconule1888
mesostyle1892
talonid1897
1892 H. F. Osborn in Amer. Naturalist 26 437 (table) New terms proposed..Upper Molars... Mesostyle [=] Median External buttress.
1932 Philos. Trans. (Royal Soc.) B. 221 444 There is at least the beginning of a mesostyle in H[yracotherium] leporinum.
1979 Nature 20 Sept. 213/1 Buccal aspects of M1 and M2 display three small styles—parastyle, mesostyle and metastyle.
1992 Jrnl. Paleontol. 66 499 A. inopinata, as in bemalambdids and Harpyodus, does not have a mesostyle on M1-2/ or a strongly V-shaped centrocrista, which are found in all other pantodonts.
This is a new entry (OED Third Edition, September 2001; most recently modified version published online March 2022).
<
n.1892