The taxonomic history of the Sumatran rhinoceros
L.C. Rookmaaker (1984) traces the taxonomic history of the Sumatran rhinoceros (Dicerorhinus sumatrensis) from its first description in 1793 through the chaotic species-splitting of the 1870s to the modern recognition of one species with three subspecies. The article examines how the sporadic arrival of specimens—first as descriptions, then as skins and skeletons, and finally as live animals—triggered repeated and often contradictory taxonomic revisions driven by limited material and personal rivalry among naturalists.
Summary
The article addresses a central problem in 19th-century mammalian taxonomy: how the irregular supply of specimens shaped the classification of a species that was geographically widespread but rarely observed in Europe. Rookmaaker shows that William Bell’s 1793 account of a double-horned rhinoceros shot near Bencoolen established the animal’s existence for over two decades without a formal scientific name. The first name, Rhinoceros sumatrensis, was proposed by G. Fischer in 1814, but it was not until the 1870s that the arrival of live specimens at the London Zoo provoked a burst of taxonomic activity and the description of multiple new species in rapid succession.
The core of the article is the controversy between P.L. Sclater and J.E. Gray over the specific status of the Chittagong and Malayan rhinoceroses that arrived at the London Zoo in 1872. Sclater, drawing on the distinctive ear-hairing of the Chittagong animal, proposed a new species (R. lasiotis), while Gray, relying on colour and skull morphology, insisted the Chittagong animal was a typical sumatrensis and instead elevated the Malayan specimen to a separate species (C. niger). Rookmaaker demonstrates that neither position was well supported by the available evidence, and that the dispute was as much a matter of personal animosity and institutional rivalry as of scientific merit. Resolution came only after Gray’s death in 1875, when W.H. Flower’s osteological work and Oldfield Thomas’s examination of the Chittagong animal’s remains after its death in 1900 gradually stabilised the classification.
Rookmaaker draws on a wide range of primary sources: Bell’s original 1793 account in the Philosophical Transactions, museum catalogue entries from the Royal College of Surgeons and the British Museum, Blyth’s 1862 memoir on Asian rhinoceroses, and the published papers of Sclater, Gray, Flower, and Thomas. The article also incorporates Rookmaaker’s own earlier work on the distribution of the species in Borneo, India, and the Indochinese region, which provides the biogeographical context for evaluating the taxonomic decisions.
Key Findings
- Ten specific or subspecific names have been proposed for the Sumatran rhinoceros since 1814; only three are currently recognised as valid subspecies of Dicerorhinus sumatrensis: D. s. sumatrensis (Sumatra and Malayan peninsula), D. s. lasiotis (NE India, Bangladesh, Burma), and D. s. harrissoni (Borneo) (p. 21).
- The Chittagong rhinoceros, the first Sumatran rhinoceros in a British zoo, was purchased by the Zoological Society of London on 14 February 1872 for £1250 and lived in captivity until 31 August 1900 (p. 16).
- The Malayan rhinoceros, caught in the Sungei Ujong district of Negri Sembilan, was purchased for £600 on 2 August 1872 and died on 21 September 1872; its remains are held in the British Museum (Natural History) as no. 1872.12.31.1 (p. 16).
- Gray’s 1854 description of Rhinoceros crossii was based on a single horn of unknown origin, 31.5 inches (80 cm) along the curve, which is now generally identified as the record-length horn of Dicerorhinus sumatrensis (p. 15).
- Oldfield Thomas (1901), examining the remains of the Chittagong rhinoceros after its death, found that the distinctive ear-hairing had diminished to less than 2 inches and that the colour resembled other specimens, leading him to reduce R. lasiotis to a northern subspecies characterised mainly by greater size (p. 21).
- Groves (1965) described the Bornean subspecies D. s. harrissoni after finding that Bornean skulls were markedly smaller than those from other populations; he later (1967) synonymised D. s. niger with D. s. sumatrensis after examining 49 skulls (p. 21).
Conclusion
Rookmaaker’s definitive takeaway is that the taxonomic history of the Sumatran rhinoceros is a case study in how limited specimen availability, personal rivalry among naturalists, and the slow accumulation of osteological data combined to produce a prolonged period of nomenclatural instability. The eventual stabilisation into one species with three subspecies reflects not a sudden breakthrough in understanding but the gradual convergence of evidence as more skulls became available for comparison and the most contentious taxonomists passed from the scene.
Context
- The article draws on primary sources from the British Museum (Natural History), the Hunterian Museum of the Royal College of Surgeons, the Museum National d’Histoire Naturelle in Paris, and the Asiatic Society of Bengal in Calcutta, as well as published proceedings of the Zoological Society of London and the British Association.
- Historiographically, the paper contributes to the 1980s literature on the history of zoological nomenclature by providing a detailed, source-based account of how a single species’ classification was shaped by institutional and personal dynamics in Victorian natural history.