atavus

'Atavism', it expresses this tendency to revert to the ancestral type, and comes from the Latin word 'atavus', ancestor.

Lectures and Essays Thomas Henry Huxley 1860

'Atavism', it expresses this tendency to revert to the ancestral type, and comes from the Latin word 'atavus', ancestor.

The Perpetuation of Living Beings; hereditary transmission and variation Thomas Henry Huxley 1860

This is a much disputed question, and a great deal depends upon the meaning to be attached to the unsatisfactory expression "atavus," used by Pope Gregory himself, in _Evangel.

Notes and Queries, Number 29, May 18, 1850 Various

But since then the "atavus" has made its appearance, if not with five complete toes, at least with four complete and one rudimentary; and any day we may hear that Professor Marsh has found in still earlier strata a more primitive form with all five toes complete.

The Scientific Evidences of Organic Evolution George John Romanes 1871

The butterfly Papilio sjoestedti, sometimes known as the Kilimanjaro swallowtail, is restricted to Kilimanjaro, Ngorongoro and Mount Meru, although the subspecies P. atavus is found only on Kilimanjaro.

Kilimanjaro National Park, Tanzania 2009

Two new species from Lutetian (middle Eocene) rocks of Egypt, Protocetus atavus and Eocetus schweinfurthi, were described by Eberhard Fraas in that year.

Archive 2006-02-01 Darren Naish 2006

The weirdest mixosaur – and, in my opinion, the weirdest ichthyosaur – is the freakish Contectopalatus atavus.

Archive 2006-06-01 Darren Naish 2006

‘Atavism’, it expresses this tendency to revert to the ancestral type, and comes from the Latin word ‘atavus’, ancestor.

Essays 2007

It is of course possible to translate "atavus meus" merely "my ancestor;" and this will leave the relationship sufficiently undefined.

Notes and Queries, Number 29, May 18, 1850 Various

If [he said] the expectation raised by the splints of horses that, in some ancestor of the horses, these splints would be found to be complete digits, has been verified, we are furnished with very strong reasons for looking for a no less complete verification of the expectation that the three-toed Plagiolophus-like "avus" of the horse must have been a five-toed "atavus" at some early period.

Life and Letters of Thomas Henry Huxley — Volume 2 Thomas Henry Huxley 1860