The narrow-nosed rhinoceros (Stephanorhinus hemitoechus), also known as the steppe rhinoceros, is an extinct species of rhinoceros belonging to the genus Stephanorhinus that lived in western Eurasia, including Europe, and West Asia, as well as North Africa during the Pleistocene. It first appeared in Europe around 500,000 years ago during the Middle Pleistocene and survived there until 34,000 years Before Present, possibly surviving as late as 15,500 years ago in the Middle East. On average around in weight, it was comparable in size to the living black rhinoceros. The species was native to temperate and Mediterranean environments, ranging from forest to grasslands, where it fed on low growing plants and to a lesser extent woody plants. It reached its maximum geographical extent during interglacial periods, when its range would extend at least as far north as Germany and northern England. It was one of the last species of Stephanorhinus alongside Merck's rhinoceros (S. kirchbergensis), with the two species occurring alongside each other in some parts of Europe and the Caucasus. Evidence has been found that the narrow-nosed rhinoceros was exploited for food by archaic humans, including Neanderthals. Like other Stephanorhinus species, its closest living relative is the Sumatran rhinoceros.
History of research and taxonomy The species was originally described by Hugh Falconer in 1859 as Rhinoceros hemitoechus, based on remains found in cave deposits in Glamorgan, south Wales in Great Britain, dating to the Eemian/Last interglacial, around 130-115,000 years ago. The lectotype specimen (the singular type specimen later selected from an original series of type specimens) is a partial posterior half of a skull (NHML M48953), held in the Natural History Museum of London, which was collected from Minchin Hole, on the southeast coast of the Gower Peninsula in southwest Glamorgan.
The species name refers to the shape of its nasal septum, which is partially closed. In Falconer's 1868 posthumously published memoir describing S. hemitoechus, another partial posterior portion of the skull of the species of unknown age, purchased by the British Museum in 1846, now also held in the collections of the London Natural History Museum (under the specimen number PV OR 20013) likely collected from somewhere in Northamptonshire, central England was compared to the skull from Minchin Hole.Falconer, Hugh (1868) Palaeontological Memoirs and Notes of the late Hugh Falconer, compiled and edited by Charles Murchison, London, Robert Hardwicke. —Note on the Northampton and Clacton Skulls of Rhinoceros Hemitoechus. lit October, 1858. pp. 351-2
The lectotype has often erroneously historically asserted to be the specimen NHMUK 27836, also held in the London Natural History Museum, a skull collected from Middle Pleistocene sediments in the vicinity of Clacton on the east coast of England, and assigned to the species Rhinoceros leptorhinus by Richard Owen in 1846 (Rhinoceros leptorhinus was originally named by Georges Cuvier in 1822 for unrelated older rhinoceros remains from Italy). Although 1868 is often given as the date of the publication, this is incorrect, as publications by W.B. Dawkins (1867) and Gaudin (1859) indicate Falconer had coined the name prior to this.
The narrow-nosed rhinoceros, like other Stephanorhinus species was often previously assigned historically to the genus Dicerorhinus, which includes the Sumatran rhinoceros, which genetic evidence indicates is the closest living relative of Stephanorhinus.
Truncated cladogram of Rhinocerotinae, showing the position of the narrow-nosed rhinoceros relative to living and Pleistocene rhinocerotine species based on morphological and genetic data, after Borrani et al. 2025.Several claimed subspecies of S. hemitoechus has been named, including Stephanorhinus hemitoechus falconeri named by Augusto Azzaroli in 1962, which included the aforementioned Clacton skull as its lectotype, as well as remains from Germany and Italy. Stephanorhinus hemitoechus aretinus was named by Azzaroli in the same year, and includes remains from Italy and England. Stephanorhinus hemitoechus intermedius was named by Azzaroli in 1987, and includes remains from Italy. A 2025 review found all claimed subspecies of S. hemitoechus to be invalid, and that the differences were due to individual variation, as well as stage of growth and sex.
Description
The narrow-nosed rhinoceros was a large rhinoceros, though the size of the species was somewhat variable depending on local conditions. A 2016 study estimated an average body mass of as a gross average across the sampled Western European populations, with sampled individuals body mass varying from on the low end to at maximum. A 2026 study estimated an average body mass of for northern European populations and for southern Europe, though they suggested this difference may not be statistically significant, with the total range spanning from to . Compared to the earlier species S. jeanvireti, S. etruscus, and S. hundsheimensis the limb joints are relatively shallow, and the limb bones relatively broad and short.
The skull is low slung, with the cranium being downwardly directed. The nasal notch (narial incison) is deep, extending back as far as the first upper molar (M1).Fortelius, M.; Mazza, P.; Sala, B. Stephanorhinus (Mammalia-Rhinocerotidae) of the Western European Pleistocene, with a revision of S. etruscus (Falconer, 1868). Palaeontogr. Ital. 1993, 80, 63–155. Like other Stephanorhinus species, the narrow-nosed rhinoceros had a long nasal region of the skull supported by a bony (ossified) nasal septum. Like other species of Stephanorhinus, S. hemitoechus is thought to have borne two horns,P. Mazza "Ethological inferences on Pleistocene rhinoceroses of Europe" Rend. Lincei Cl. Sci. Fis. Mat. Nat. Accad. Naz., 9 (1993), pp. 127-137 though the attachment regions for the horns are "weakly developed" similar to S. etruscus but unlike S. hundsheimensis.
As in other Stephanorhinus species, it lacked incisor teeth on both upper and lower jaws. similar to living black and white rhinoceroses. The teeth are relatively high crowned (hypsodont) compared to other Stephanorhinus species, with the third molars being relatively enlarged. The teeth are relatively shifted forwards in the jaw. The lower jaw is relatively slender in comparison to S. kirchbergensis, and tapers, becoming slender and narrow towards the front (the mandibular symphysis).
Evolution and distribution The earliest remains of the species in Europe date to the early-mid Middle Pleistocene, around 500,000 years ago, with one of the oldest if not the oldest record in Europe being from Campagna Romana near Rome in Central Italy, dating to Marine Isotope Stage 13.Pandolfi, L., Gaeta, M. & Petronio, C. The skull of Stephanorhinus hemitoechus (Mammalia, Rhinocerotidae) from the Middle Pleistocene of Campagna Romana (Rome, central Italy): Biochronological and paleobiogeographic implications. Bull. Geosci. 88(1), 51–62 (2013). It is suggested to have evolved outside of Western Europe before later migrating into the region. The species may have evolved from the earlier Stephanorhinus etruscus, though other authors suggest it may have evolved from S. hundsheimensis. In comparison to the widespread Merck's rhinoceros (Stephanorhinus kirchbergensis), the narrow-nosed rhinoceros had a less geographically extensive distribution, including much of Europe,Diana Pushkina: The Pleistocene easternmost distribution in Eurasia of the species associated with the Eemian Palaeoloxodon antiquus assemblage. Mammal Review, 2007. Volume 37 Issue 3, Pages 224 - 245 as well as West Asia and North Africa. In Europe the species is known from abundant remains across the Iberian Peninsula in the west (where S. kirchbergensis appears to have been rare or absent), eastwards to Italy (as far south as Apulia and Calabria), Croatia,First Discovery of the Rhinoceros species Stephanorhinus hemitoechus (Falconer 1868) in Croatia, and its Palaeontological and Palaeoecological Significance // Abstracts, Excursion Guidebook, 4th Scientific meeting Quaternary geology in Croatia and Slovenia. (2015) Serbia, BulgariaStuart, A.J., Lister, A.M., 2007. Patterns of Late Quaternary megafaunal extinctions in Europe and northern Asia. In: Kahlke, R.-D., Maul, L.C., Mazza, P. (Eds.), Late Neogene and Quaternary Biodiversity and Evolution: Regional Developments and Interregional Correlations Vol. II, Proceedings of the 18th International Senckenberg Conference (VI International Palaeontological Colloquium in Weimar). Courier Forschungsinstitut Senckenberg 259, pp. 287-297. and Greece (possibly as far south as the Peloponnese).Tsoukala, E., and Guérin, C. (2016). The Rhinocerotidae and Suidae of the Middle Pleistocene from Petralona cave (Macedonia, Greece). Acta Zool. Bulgarica 68, 243–264. Its range extended northwards into northern France, Britain (as far north as North Yorkshire), the Netherlands,M. van Kolfschoten & R. van Uum. (1992). Een jonge steppeneushoorn uit de polder. [A young steppe rhinoceros from the polder] Cranium, 9(2), 85–88.M. van Kolfschoten. (1988). De steppeneushoorn uit Maastricht- Belvédère. [The steppe rhinoceros from Maastricht-Belvédère] Cranium, 5(1), 22–26. Germany and Slovakia during warm interglacial periods.
In North Africa, where the species was previously known as Rhinoceros subinermis, remains are known from the Maghreb in Morocco, northern Algeria, and possibly Haua Fteah cave in coastal northern Cyrenacia, northeast Libya (which were originally referred to S. kirchbergensis, which is no longer thought to have been present in Africa). In West Asia, the range of the species extends from the Levant, including Israel, Palestine, Lebanon, Jordan and Syria in the west, to western Iran, and Azerbaijan in the east, where some remains were previously referred to as the species Rhinoceros binagadensis.
Ecology
The morphology of the skull suggests that the species was adapted towards a grazing diet. Tooth wear analysis suggests that the narrow-nosed rhinoceros had a variable diet tending towards grazing or mixed feeding, and clearly distinct from the more browsing focused diet inferred for S. kirchbergensis on average. A 2026 analysis across the species temporal span in Western Europe found an overall trend for mixed feeding. Although the species has been referred to as the "steppe rhinoceros" and presumed to have had a preference for open habitats, the species was ecologically plastic, and occurred in both open grasslands and forested environments. In Europe the species was found in temperate as well as cool climates, and seems to have been intolerant of cold climate conditions like those typically inhabited by the woolly rhinoceros. Its dietary flexibility likely helped it tolerate cool glacial periods. In the Middle East the species inhabited warm, open xeric habitats. In Lebanon, it is suggested to have generally had a mixed feeding diet that periodically saw a significant increase in browse consumption, with Lebanese populations of the narrow-nosed rhinoceros having tooth wear likely having a seasonally increased intake of "dust-laden or gritty low-lying vegetation, as well as bark stripping, or small branches and twigs feeding" plausibly corresponding to the end of the dry season during September-December when abundance of herbaceous vegetation significantly declined compared to the rest of the year.