Dihoplus kirchbergensis

Overview

Dihoplus kirchbergensis is an ancient rhinoceros encountered through Eurasian fossils. Skulls play a major role in understanding it. A newly discovered riverside skull and a rediscovered museum specimen tell different stories.^[1][2]

Key facts

Tracing a fossil’s whereabouts can resemble detective work. A skull from the Irkutsk region was long unlocated before being identified again in the collections of the Zoological Institute of the Russian Academy of Sciences in Saint Petersburg. It bore the incorrect number 10817; its actual specimen number was 10718.^[1]

Time and place

This rhinoceros appears in studies of Pleistocene Eurasia. Skulls from places including present-day northern Italy, Germany, and Russia’s Irkutsk region have been studied. Connecting discoveries near Italy’s Po River with Siberian sites on a map conveys the breadth of the research setting.^[2][1]

The time range describes source context, not the complete duration of this species.

Size, form and skeleton

The skull is an important starting point for comparing its appearance. The complete, well-preserved Spinadesco specimen allowed diagnostic features to be reassessed. In contrast, the Irkutsk specimen lacks teeth and a lower jaw. Fossils preserving different parts are compared together to understand the head.^[2][1]

A 2020 study comparing ankle-bone form with body size treated Merck’s rhinoceros as weighing approximately 1.84 tonnes. It used an estimate from earlier fossil research, helping convey the size of this large rhino also known as Stephanorhinus kirchbergensis.^[9]

Habitat and reproduction

Another individual from the Chondon River valley in the Russian Arctic preserved dietary traces. Plant fragments, including larch, birch, and grasses, were identified in molar recesses, while dental microwear suggests that it mainly ate leaves and twigs during the final months of its life. Researchers reconstructed a cold, humid landscape of grassland and open woodland.^[3]

Fossil discovery

In July 2013, a well-preserved skull was found on a depositional sandbank in the Po River near Spinadesco in northern Italy. The discovery did more than add a specimen: researchers used its features to reassess the classification of other skulls already known from the Po Valley.^[2]

References

1. Billia (2008) — Rediscovery of a rhinoceros skull from the Irkutsk region
2. Persico et al. (2015) — A well-preserved rhinoceros skull from Spinadesco
3. Kirillova et al. (2017) — Food preserved on the teeth of an Arctic rhinoceros
4. Billia·Zervanová — Linking Eurasian discovery records and scientific names
5. Huttunen·Göhlich (2002) — The Prodeinotherium skeleton from Unterzolling
6. International Commission on Stratigraphy (2024) — Geological time chart
7. Persico et al. (2015) — A well-preserved rhinoceros skull from Spinadesco
8. Billia (2008) — Rediscovery of a rhinoceros skull from the Irkutsk region
9. Etienne et al. (2020) — Body mass and ankle-bone shape in rhinoceroses

Research questions

The species also appears in papers as Stephanorhinus kirchbergensis. New comparative material prompts reexamination of old fossil classifications. A skull discovered at Daxlanden, Germany, in 1802 was recorded under several names during its long research history. Following these changes reveals changing ways of understanding fossils.^[4][1]

Observation

First examine the head outline and mouth region. When viewing fossil evidence, also note whether teeth remain. Finding dietary traces in teeth, as in the Chondon individual, allows us to look beyond skull appearance into an animal’s final months.^[3]