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Merychippus insignis Leidy 1856 (horse)

Mammalia - Perissodactyla - Equidae

PaleoDB taxon number: 48183

Alternative combinations: Merychippus (Merychippus) insignis, Protohippus (Merychippus) insignis, Protohippus insignis

Synonyms: Hipparion paniense Cope 1874 (no. 394290), Hipparion paniensis Cope 1874 (no. 46996), Hippotherium paniense Cope 1874 (no. 47043), Merychippus (Merychippus) paniensis Cope 1874 (no. 361171), Merychippus paniensis Cope 1874 (no. 48191)

Full reference: J. Leidy. 1856. Notices of Extinct Vertebrata Discovered by Dr. F. V. Hayden, during the Expedition to the Sioux Country under the Command of Lieut. G. K. Warren. Proceedings of the Academy of Natural Sciences of Philadelphia 8:311-312

Belongs to Merychippus according to B. J. MacFadden 1998

Sister taxa: Merychippus (Merychippus), Merychippus (Protohippus), Merychippus brevidontus, Merychippus calamarius, Merychippus californicus, Merychippus coloradense, Merychippus eohipparion, Merychippus eoplacidus, Merychippus gunteri, Merychippus isonesus secundus, Merychippus labrosus, Merychippus missouriensis, Merychippus patruus, Merychippus primus, Merychippus proparvulus, Merychippus quartus, Merychippus quintus, Merychippus relictus, Merychippus republicanus, Merychippus sejunctus, Merychippus seversus, Merychippus stevensi

Type specimens:

  • Merychippus insignis: Its type locality is Niobrara River (coll. Hayden 1857), which is in a Miocene terrestrial horizon in the Loop Fork Formation of Nebraska.
  • Merychippus paniensis: AMNH 8249, a tooth ( right upper molar, M1).

Ecology: scansorial insectivore

Average measurements (in mm): P3 20.5 x 20.7, P4 20.1 x 20.7, M1 18.5 x 20.1, p3 19.5 x 12.5, p4 19.5 x 12.3, m1 18.1 x 10.7