There are some additional cytological [ 61] and molecular evidence [ 62] suggesting that the evolution and maintenance of asexuality in Bdelloidea is of relatively ancient origin, dating back to more than tens of millions of years ago.
This isn't exactly a foregone conclusion: there are examples of relatively ancient pottery -- 4,000 to 6,000 years old -- at several other points in the museum, as we shall see.
Although some Ty3/gypsy LTRrs show evidence of recent activity, an important fraction are inactive remnants of relatively ancient insertions apparently subject to genetic drift.
Thus, habitat suitability for the endangered broad-headed snake may be spatially heterogeneous as a result of relatively ancient local events that reduced gecko numbers.
"It will simply give the appellant, his partner and their young children a measure of temporary protection against further and repeated invasions of privacy pending a full trial which will not have been rendered substantially irrelevant by disclosure of relatively ancient sexual history".
In contrast to the previously reported introgression events within the genus Lepus, some of the mtDNA introgression events among Chinese Lepus species were estimated to be relatively ancient.
The abundant chromosome polymorphisms found across the range of D. robusta are thus likely to be relatively ancient, having accumulated over many well known climatic cycles in North America.
And while the technology involved may be relatively ancient, it's also potentially more practical than some of the other solutions we've seen.
These geographically isolated and deeply divergent lineages of Crenadactylus appear to be relatively ancient relics of a former much wider distribution, now greatly attenuated by the expansion of severe aridity.
The history of gene conversion between prfA and prfB appears to be relatively ancient, preceding the divergence of the Bemisia and Trialeurodes host lineages, as the Portiera TV genome contains a pair of identical 56-bp repeats in the same region (fig. 3 c).
