Arsinoitherium zitteli
- Rodrigo
- Mar 19
- 2 min read
Updated: 1 day ago
Age
Paleogene（Eocene-Oligocene）
36-27 Ma
Taxonomy
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Embrithopoda
Family: Arsinoitheriidae
Genus: Arsinoitherium
Species: Arsinoitherium zitteli
Morphological description
Arsinoitherium zitteli reached a shoulder height of about 1.75 meters and a body length of approximately 3 meters, comparable in size to a modern white rhinoceros. However, unlike rhinoceroses, it was not a typical open-grassland inhabitant, but instead favored humid tropical forests and swampy environments. Its dentition is considered primitive, consisting of a total of 44 teeth with low crowns. This dental morphology suggests a diet primarily composed of broad-leaved vegetation and soft foliage.
The overall appearance of Arsinoitherium zitteli is striking. It possessed a pair of massive horns extending from the top of the skull toward the nasal region. Unlike the keratinous horns of rhinoceroses, these structures were composed of bone. Its limbs also differed markedly from those of rhinos, showing proportions and structure more reminiscent of modern elephants.
Etymology
The genus name Arsinoitherium is derived from Arsinoe II (Αρσινόη Bʹ), the queen of Pharaoh Ptolemy II (Πτολεμαῖος Φιλάδελφος) of the Ptolemaic dynasty. The first discovered fossil specimen—also the most complete—was found near the ruins of her palace. In honor of this historical figure, the animal was named "the beast of Arsinoe".
Biological description
Arsinoitherium zitteli was a large herbivorous mammal that lived from the Eocene to the Oligocene. Its morphology combines features reminiscent of both rhinoceroses and elephants.
Phylogenetically, embrithopods are more closely related to modern Proboscidea (elephants) and Hyracoidea (hyraxes) than to Perissodactyla. All three groups belong to the clade Afrotheria.
In the context of mammalian evolution, Arsinoitherium zitteli represents one of the early lineages to achieve large body size. It rose to prominence in the late Eocene and persisted for approximately six million years, inhabiting regions across Africa and the surrounding Mediterranean areas. Sedimentary evidence associated with its fossils indicates that it likely occupied coastal swamps and warm, humid lowland forests with dense vegetation, spanning areas that correspond to present-day Africa and the Arabian Peninsula.
（Author: Rodrigo）
References
Alan Turner & Mauricio Anton.（2004） .Evolving Eden, An Illustrated Guide to the Evolution of the African Large-Mammal Fauna. New York: Columbia University Press.
Donald r. prothero. (2016). The Princeton Field Guide to Prehistoric Mammals. Princeton University Press.
29.30, 30.84
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