Thus, it is likely that these regions represent extinct phage remnants that are not functional anymore.
However, their skeleton was very different from anything known in the Cnidaria, and they may represent a separate, extinct phylum, probably triploblastic (see Babcock 1991 for a defense of the separate phylum hypothesis, and Van Iten 1991 for a defense of the cnidarian hypothesis).
They are clearly distinct and separate alleles, not derived from any of the other identified alleles by simple mutation or recombination, and it is tempting to speculate that they may represent either remnants of otherwise now-extinct cultivar-groups or introgressions from wild relatives.
The ape, Junzi imperialis, described in Friday's edition of the journal Science, may represent the earliest documented ape extinction since the last ice age — and could be the first known to go extinct because of human influence.
Alternatively, the Iberian population may represent an early human-mediated translocation from a now extinct refugial source.
Four isolates, TX5058 from 2005, TX6747 and TX7191 from 2007, and TX7827 from 2009, did not fall into any of the 6 groups and may represent single isolates that did not have any advantage and thus became extinct.
They may be preserved in an unusual way; they may represent only a part or fragment of an organism; they may belong to extinct taxa; and/or their living counterparts may be unfamiliar or unknown.
It is suggested that the Harnham evidence may represent an insular population that had persisted in southern Britain since MIS 10/9, which became locally extinct during the glacial maximum 8.2 marking the end of MIS 8.
The green and budding twigs may represent existing species; and those produced during each former year may represent the long succession of extinct species.
But soon, it may be extinct.
Arctic foxes may be extinct in a few years' time.
