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Merychippus isonesus quartus
Taxonomy
Merychippus isonesus quartus was named by Osborn (1918) [named as a subspecies of M. isonesus by Osborn 1918; raised to species level]. Its type specimen is AMNH 14184, a partial skeleton (Part of skeleton without skull parts or teeth.), and it is a 3D body fossil.
It was recombined as Merychippus (Protohippus) quartus by Stirton (1940); it was considered a nomen vanum by Downs (1956); it was considered a nomen dubium by Macdonald (1992).
It was recombined as Merychippus (Protohippus) quartus by Stirton (1940); it was considered a nomen vanum by Downs (1956); it was considered a nomen dubium by Macdonald (1992).
Synonymy list
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Merychippus isonesus quartus Osborn 1918
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. F. Osborn 1918 | (1) Limb bones as long as in M. isonesus quintus but decidedly more slender; (2) shafts of limb bones of same weight as in M. isonesus tertius but considerably more elongate; (3) metapodials of same length as in M. isonesus quintus but smaller at distal ends; (4) shafts of lateral digits and the lateral phalanges much as in M. isonesus secundus. |