"Others have questioned inclusion of Hyracotherium in this grouping
In the first place, it is not clear that Hyracotherium was the ancestral horse”.
G. A. Kerkut, Implications of evolution, 1960, pg 149.
Matthew has shown and insisted that Hyracotherium (including Eohippus) is so primative that it is not much more definitely equid than tapir, rhinocerotid, etc, but it is customary to place it at the root of the equid group.
G.G. Simpson, as quoted by Kerkut in Implications of evolution
H. Nilsson maintains that while Hyracotherium does not resemble present-day horses in any way, they were remarkably similar to the present-day Hyrax."
You don't find it the leat bit important to address responses to your posts before you simply repeat the same things again, do you?
And always without any supporting references.
To review, first you say that Hyracotherium cannot be a horse ancestor because it is a rhino ancestor. (Ignoring that the two are not mutualy exclusive and that in fact the fossil record suggest that both are true. With genetics to back it up.) Then you say that it cannot be a horse ancestor because it is a hyrax.
Can you please make up your mind! YOu cannot just take a bunch of mutually exclusive speghetti, throw it on a wall and hope something sticks.
Use of mitochondrial DNA sequences to test the Ceratomorpha (Perissodactyla:Mammalia) hypothesis, C. Pitra and J. Veits, Journal of Zoological Systematics & Evolutionary Research, Volume 38 Issue 2 Page 65 - June 2000., or something very, very closely related (likely different species of that genera) really is the ancestor of both horses and rhinos and tapirs.
["Use of mitochondrial DNA sequences to test the Ceratomorpha (Perissodactyla:Mammalia) hypothesis", C. Pitra and J. Veits, Journal of Zoological Systematics & Evolutionary Research, Volume 38 Issue 2 Page 65 - June 2000.]
And a hyrax is nothing like Hyracotherium. Here are their skulls.
Again.
Hyracotherium
Hyrax
""The first animal in the series, Hyracotherium (Eohippus) is so different from the modern horse and so different from the next one in the series that there is a big question concerning its right to a place in the series . . [It has] a slender face with the eyes midway along the side, the presence of canine teeth, and not much of a diastema (space between front teeth and back teeth), arched back and long tail."—H.G. Coffin, Creation: Accident or Design? (1969), pp. 194-195."
Nice try. But not in your favor.
You must be more specific and tell us wheret he impossible transitions alledgedly are.
The "slender face" and "diastema" gradually changed as a result of the teeth geting larger and deeper in the transition from a browsing to grinding animal.
I am not sure where the impossible loss of the canines is said to have occurred nor why the loss of these teeth is impossible.
The "arched back" was part of the gradual change to a galloping animal. Many parts of the proto horses became less flexible and/or fused.
""Once portrayed as simple and direct, it is now so complicated that accepting one version rather than another is more a matter of faith than rational choice. Eohippus, supposedly the earliest horse, and said by experts to be long extinct and known to us only through fossils, may in fact be alive and well and not a horse at all—a shy, fox-sized animal called a daman that darts about in the African bush."—*Francis Hitching, The Neck of the Giraffe (1982), p. 31."
This is the same claim as addressed above with the skulls which look nothing alike.
"Daman" is another name for "Hyrax."
As we can see by the images of the skulls, these are nothing alike.
In addition, you are not contradicting yourself by claiming that both Hyracotherium and Eohippus are a hyrax.
Make up your mind.
In the first place, it is not clear that Hyracotherium was the ancestral horse”.
G. A. Kerkut, Implications of evolution, 1960, pg 149.
Matthew has shown and insisted that Hyracotherium (including Eohippus) is so primative that it is not much more definitely equid than tapir, rhinocerotid, etc, but it is customary to place it at the root of the equid group.
G.G. Simpson, as quoted by Kerkut in Implications of evolution
H. Nilsson maintains that while Hyracotherium does not resemble present-day horses in any way, they were remarkably similar to the present-day Hyrax."
You don't find it the leat bit important to address responses to your posts before you simply repeat the same things again, do you?
And always without any supporting references.
To review, first you say that Hyracotherium cannot be a horse ancestor because it is a rhino ancestor. (Ignoring that the two are not mutualy exclusive and that in fact the fossil record suggest that both are true. With genetics to back it up.) Then you say that it cannot be a horse ancestor because it is a hyrax.
Can you please make up your mind! YOu cannot just take a bunch of mutually exclusive speghetti, throw it on a wall and hope something sticks.
Use of mitochondrial DNA sequences to test the Ceratomorpha (Perissodactyla:Mammalia) hypothesis, C. Pitra and J. Veits, Journal of Zoological Systematics & Evolutionary Research, Volume 38 Issue 2 Page 65 - June 2000., or something very, very closely related (likely different species of that genera) really is the ancestor of both horses and rhinos and tapirs.
["Use of mitochondrial DNA sequences to test the Ceratomorpha (Perissodactyla:Mammalia) hypothesis", C. Pitra and J. Veits, Journal of Zoological Systematics & Evolutionary Research, Volume 38 Issue 2 Page 65 - June 2000.]
And a hyrax is nothing like Hyracotherium. Here are their skulls.
Again.
Hyracotherium
Hyrax
""The first animal in the series, Hyracotherium (Eohippus) is so different from the modern horse and so different from the next one in the series that there is a big question concerning its right to a place in the series . . [It has] a slender face with the eyes midway along the side, the presence of canine teeth, and not much of a diastema (space between front teeth and back teeth), arched back and long tail."—H.G. Coffin, Creation: Accident or Design? (1969), pp. 194-195."
Nice try. But not in your favor.
You must be more specific and tell us wheret he impossible transitions alledgedly are.
The "slender face" and "diastema" gradually changed as a result of the teeth geting larger and deeper in the transition from a browsing to grinding animal.
I am not sure where the impossible loss of the canines is said to have occurred nor why the loss of these teeth is impossible.
The "arched back" was part of the gradual change to a galloping animal. Many parts of the proto horses became less flexible and/or fused.
""Once portrayed as simple and direct, it is now so complicated that accepting one version rather than another is more a matter of faith than rational choice. Eohippus, supposedly the earliest horse, and said by experts to be long extinct and known to us only through fossils, may in fact be alive and well and not a horse at all—a shy, fox-sized animal called a daman that darts about in the African bush."—*Francis Hitching, The Neck of the Giraffe (1982), p. 31."
This is the same claim as addressed above with the skulls which look nothing alike.
"Daman" is another name for "Hyrax."
As we can see by the images of the skulls, these are nothing alike.
In addition, you are not contradicting yourself by claiming that both Hyracotherium and Eohippus are a hyrax.
Make up your mind.