This link has an illustration of Anchitherium.
Anchitherium aurelianense was a horse of the Miocene. The systematic paleontology of it is:
Mammalia Linnaeus 1758
Perissodactyla Owen 1848
Equidae Gray 1821
Anchitheridae Leidy 1869
Anchitherium von Meyer 1844
Anchitherium aurelianense Cuvier 1825
Anchitherium aurelianense was three-toed and about 60 cm. (1.97 feet) in height.
Fossil remains of Anchitherium aurelianense have been discovered at Mala Miliva in Serbia. They are dated to the Tortonian interval (11.61 - 7.25 million years ago) of the Miocene. [Note - The source of this information is The Paleobiology Database.] Two fossil specimens were found at Bunol (Cerro de la Cruz) in Valencia, Spain. They date to the Burdigalian stage (20.43 - 15.97 million years ago). Some remains have been unearthed at Povo de Santaren in Portugal; they are dated to the MN 6 span (13.7 - 12.75 million years ago). MN 6 remains were also found at Belomechetskaia in Russia. Three fossil specimens were excavated in the Falun section at Sos in France. Those date to the Langhian interval (15.97 - 13.65 million years ago). Fossil remains have also been discovered at Zurich, Switzerland; they are dated to the MN 5 interval (16 - 13.7 million years ago). Remains dating to a span of 15.97 - 11.61 million years ago
(Langhian-Serravallian) were unearthed at Opole 1 in Silesia, Poland.
Fossil remains dating to the Serravallian (13.65 - 11.61 million years ago) have been excavated at Erlanggang in Huberi China. [Note - The source of this information is The Paleobiology Database.] Other remains were found in the Dongxuan beds at Fangshan in Nanjiang, China. They date to a late Miocene span of 11.61 - 5.33 million years ago.
Maria Teresa Alberdi, Leonard Ginsberg, and Jesus Rodriguez wrote an article titled Anchitherium aurelianense (Mammalia, Equidae) (Cuvier, 1825) from the Orleanian (Miocene) of France. It was published in 2004 in Geodiversitas. This quote from the abstract says:
The characters of the horse Anchitherium Meyer, 1844 are very conservative. While its dental morphology is quite constant, it postcranial morphology is more variable. Fossil remains from the Orleanian (early to middle Miocene MN3 - MN5) localities of Baigneaux-Beauce, Pontlevoy and Thenay, Faluns d'Anjou, Chevilly, Neuville-aux-Bois, Chilleurs-aux-Bois, Chitenary, and Montabuzara (Loire basin) and La Romieu (Aquitaine basin) were studied. Based on their tooth and limb morphology, these fossil remains were assigned to Anchitherium aurelianense aurelianense (Cuvier, 1825). The type specimen of the subspecies comes from Montabuzard. We also studied new fossil remains from the following localities within the Sable de l'Orleanais region (France): Tavers-les-Paves, and Boisde Maigreville (=Graviers de l'Orleanais). Dental material from Tavers-les-Paves was attributed to A.a. hippoides Lartet, 1851. Remains from other localities were
characterized by mid-to small-sized skeletons and smallish teeth (smaller than the A.a. hippoides teeth from the more recent localities of Sansan and Simbre [France]). The material from the Bufol (Spain) horse was very similar to that of horses of Baigneaux-en-Beauce and other French localities, and was therefore assigned to A.a. aurelianense. This study showed a strong correlation between tooth and postcranial morphologies and size among all the remains. We consider that all the remains from the Sables de l'Orleanais belong to the same species. From a palaeoecological point of view, the characters of A.a. aurelianense suggest a more closed environment than do those of the more recent subspecies from the middle Miocene.
Anchitherium navasotae is a sister species of A. aurelianense. A fossil specimen of Anchitherium navasotae was found in the Oakville Formation at Garvin Gully in Grimes County, Texas, in the USA. The strata in which it was unearthed is dated to the Miocene. The age estimate is 18.7 - 18.6 million years ago. [Note - The source of this information is The Paleobiology Database.]
This publication is a reference:
Ye, J., W.-Y. Wu, and J. Meng. 2005. Anchitherium (Perissodactyla, Mammalia) from the Halamagi Formation of Northern Junngar Basin, Xinjiang. Vertebrata Palasiatica, 43(2): 100-109.