Joined: Feb. 2006
Joke's been gorging on stupid pills again.
|ET December 15, 2019 at 6:42 pm|
What? There was never a giraffe with a short neck.
Not an extant giraffe but there were plenty of ancestral giraffids, over 30 known from the fossil record, with much shorter necks. Most had necks no longer than extant okapis, the giraffe's only living relative.
Canthumerycidae: This contains the earliest known giraffid, Canthumeryx sirtensis, known from the early Miocene of Libya and Kenya.
Okapiinae: Extant okapis, and Afrikanokeryx leakeyi (formerly known as Palaeotragus primaevus from the mid-Miocene of Ngorora, Kenya). These animals retain relatively ancestral body proportions.
Giraffokerycinae: This mid-Miocene group contains the Asian species Giraffokeryx punjabiensis and the African Giraffokeryx primaevus.
Sivatheriinae: A group of large-bodied girafffids from the Pliocene epoch (5 million to 2.6 million years ago) and the Pleistocene epoch (2.6 million to 11,700 year ago), including the genera Sivatherium, Bramatherium and Helladotherium. These animals have stout and robust limbs. Many taxa have two pairs of ossicones (with the front pair partially fused in Bramatherium).
Palaeotraginae: This contains the key ‘intermediate’ species Samotherium major from Samos in Greece, among others such as Palaeotragus and Shansitherium.
Bohlininae: Giraffids with markedly elongated metapodial leg bones (and probably an elongated neck). Represented by Bohlinia attica and Honanotherium schlosseri. The position of Bohlinia on the evolutionary tree is crucial, as its descendants may represent the origin of the genus Giraffa, which includes modern giraffes.
Giraffinae: Giraffa spp. feature skulls containing extensive sinuses, long metapodials and a suite of unique characteristics in the cervical vertebrae, or bones of the neck. The ossicones are simple, and both sexes have them. Several extinct species are known from the Pleistocene of Asia and Africa. There are nine sub-species of G. camelopardalis, but DNA analysis suggests that some of these are actually genetically separate species.
|ET: There isn’t any known mechanism that could produce a giraffe’s neck from short, mammalian neck.|
Joke is too ignorant to know giraffes have the same number of neck vertebrae, seven, as other mammals including humans. In the giraffe the vertebrae have evolved to become extremely elongated.
|Fossils Shed New Light on Evolution of Elongated Giraffe Neck|
The evolution likely occurred in two stages as one of the animal’s neck vertebrae stretched first toward the head and then toward the tail a few million years later, according to a new study of extinct giraffids’ cervical vertebrae.
The study, published online in the journal Royal Society Open Science, shows the specifics of the evolutionary transformation in extinct species within the giraffe family.
“First, only the front portion of the C3 vertebra lengthened in one group of species,” explained study senior author Dr Nikos Solounias from the New York Institute of Technology College of Osteopathic Medicine.
“The second stage was the elongation of the back portion of the C3 neck vertebra.”
“The modern giraffe (Giraffa camelopardalis) is the only species that underwent both stages, which is why it has a remarkably long neck,” he said.
No one does willful ignorance better than Joke Gallien.
"CO2 can't re-emit any trapped heat unless all the molecules point the right way"
"All the evidence supports Creation baraminology"
"I'm a female retired marine biologist"
Whizz-dumb from Joe "Sharon" Gallien, world's dumbest female impersonator YEC.