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TILLODONTIA

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Originally appearing in Volume V26, Page 976 of the 1911 Encyclopedia Britannica.
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TILLODONTIA , a See also:

group of mammals of uncertain position, typified by Tillotherium from the See also:Middle See also:Eocene of See also:Wyoming, (From See also:Marsh.) See also:Skull of Tillotherium fodiens. (* nat. See also:size.) and perhaps including Esthonyx from the See also:Lower Eocene of the same See also:district, and other genera from the same See also:horizon in both See also:North See also:America and See also:Europe. In Tillotherium the skull is decidedly rodent-like, with an elongated See also:cranial and a See also:short facial portion, and a small See also:brain-cavity; the jugal See also:bone occupying the middle of the zygomatic See also:arch. The dentition, of which the See also:formula is i., c. , p. , m. i, also approximates to the rodent type, the canines being See also:minute and functionless, and the first pair of incisors large and See also:chisel-like. On these and other grounds it has been suggested that Tillotherium (of which the greater See also:part of the See also:skeleton is known) indicates the ancestral See also:form of the See also:Rodentia. See also:Professor Max See also:Weber considers, however, that such a view has but little See also:justification. Relationship with the See also:Ungulata and Carnivera has also been suggested; if there be any with the latter, it must have been with the most See also:primitive forms, as the plantigrade feet are furnished with five toes carrying See also:long pointed claws. Possibly Platychoerops richardsoni, from the Lower Eocene See also:London See also:Clay, belongs to the group. (R.

End of Article: TILLODONTIA

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