Denisovan

'Cladogram of Homo longi (Denisovans) based on Feng et al., 2025': ★ indicates genetically confirmed Denisovans }} Denisovans might represent a new species of Homo or an archaic subspecies of Homo sapiens (modern humans), but up until the Harbin cranium was identified as a Denisovan in June 2025 through the mitochondrial DNA H. denisoviensis (Picq, 2011), H. denisovan (Gabriel & Mihaela, 2011), and H. denisova (Gunbin et al., 2012). In 2025, Denné Reed argued that the informal name "Denisovans" represents the better system than proactively proposed names to reference this archaic human group due to its uncertain biological status as an independent evolutionary lineage. He suggested that "H. altaiensis" represents a nomen nudum ("naked name"), since its description lacks differential diagnosis, does not clearly display the intent of naming a new species and lacks a fixed type specimen. He also suggested that the names "Homo daliensis" and "Homo mapaensis" are conditionally proposed which makes them unavailable based on ICZN article 15, while considered "Homo tsaichangensis" (intended name for Penghu 1 in a self-published digital book) to be unpublished and unavailable, as it does not contain evidence of ZooBank registration within the published work which fails to conform to the ICZN articles 8.5.3.1 and 8.5.3.2. Research published in 2024 proposed classifying Denisovans as part of the conditional species Homo juluensis based on the similarities between Denisovan and H. juluensis molars, prior to the classification of Denisovans as Homo longi based on DNA evidence. Some older findings called "East Asian Archaics" have been associated in studies with the Denisovans but may or may not belong to the Denisovan line. Such findings include the Dali skull, the Xuchang crania, the Jinniushan human, the Hualongdong people, Yunxian Man, Maba Man, and the Narmada Human. In 2024, paleoanthropologists Christopher Bae and Xiujie Wu designated the Xujiayao fossils as the holotype of the species Homo juluensis with Xuchang as the paratype, and suggested sinking Denisovans into this species. They recommended relegating the Dali Man and the similar specimen Jinniushan to H. longi. In 2025, Fu and colleagues retrieved mitochondrial DNA from the dental calculus of the Harbin cranium (H. longi holotype), reporting that it falls within the variation of seven previously sequenced Denisovan mitochondrial DNA. In 2008, Michael Shunkov from the Russian Academy of Sciences and other Russian archaeologists from the Institute of Archaeology and Ethnography of the Siberian Branch of the Russian Academy of Sciences in Novosibirsk Akademgorodok investigated the cave and found the finger bone of a juvenile female hominin originally dated to 50–30,000 years ago. The estimate has changed to 76,200–51,600 years ago. In 2019, Greek archaeologist Katerina Douka and colleagues radiocarbon dated specimens from Denisova Cave, and estimated that Denisova 2 (the oldest specimen) lived 195,000–122,700 years ago. Older Denisovan DNA collected from sediments in the East Chamber dates to 217,000 years ago. Based on artifacts also discovered in the cave, hominin occupation (most likely by Denisovans) began 287±41 or 203±14 ka. Neanderthals were also present 193±12 ka and 97±11 ka, possibly concurrently with Denisovans. An mtDNA-based phylogenetic analysis of these individuals suggested that Denisova 19, 20, and 21 are the oldest, followed by Denisova 2, then Denisova 8; while Denisova 3 and Denisova 4 were roughly contemporaneous. Denisova Cave contained the only known examples of Denisovans until 2019, when a research group led by Fahu Chen, Dongju Zhang, and Jean-Jacques Hublin described a partial mandible discovered in 1980 by a Buddhist monk in the Baishiya Karst Cave on the Tibetan Plateau in China. Known as the Xiahe mandible, the fossil became part of the collection of Lanzhou University, where it remained unstudied until 2010. It was determined by ancient protein analysis to contain collagen that by sequence was found to have close affiliation to that of the Denisovans from Denisova Cave, while uranium decay dating of the carbonate crust enshrouding the specimen indicated it was more than 160,000 years old. The identity of this population was later confirmed through study of environmental DNA, which found Denisovan mtDNA in sediment layers ranging in date from 100,000 to 60,000 years before present, and perhaps more recent. A 2024 reanalysis identified a partial Denisovan rib fragment dating to between 48,000 and 32,000 BP. In 2018, a team of Laotian, French, and American anthropologists, who had been excavating caves in the Laotian Annamite Mountains since 2008, was directed by local children to the site Tam Ngu Hao 2 ("Cobra Cave") where they recovered a human tooth. The tooth (catalogue number TNH2-1) developmentally matches a 3.5 to 8.5 year old, and a lack of amelogenin (a protein on the Y chromosome) suggests it belonged to a girl, barring extreme degradation of the protein over a long period of time. Dental proteome analysis was inconclusive for this specimen, but the team found it anatomically comparable with the Xiahe mandible, and so they categorized it as a Denisovan. The tooth probably dates to 164,000 to 131,000 years ago. In 2022, a team from Germany, Austria, Russia and the UK found three Denisovans (Denisova 19, 20, 21) from layer 15 of the East Chamber, in Denisova Cave. It turns out that the mtDNA sequences of Denisova 19 and 21 are identical, indicating that they may belong to the same individual or be maternal relatives. The divergence date for the mtDNAs of the three new and the four previously published Denisovans is 229 ka (206–252 ka 95% Cl) during the Interglacial period MIS 7. During DNA sequencing, low proportions of the Denisova 2, Denisova 4 and Denisova 8 genomes were found to have survived, but high proportions of the Denisova 3 and Denisova 25 genomes were intact. In 2008, a Taiwanese citizen purchased a fossil Homo mandible, dredged from the sea floor of the Taiwan Strait, from an antique shop and donated it to the Taiwan National Museum of Natural Science. Attempts to extract DNA were unsuccessful, but in 2025 protein analysis of the specimen, designated Penghu 1, was published showing that it belonged to a male Denisovan. In 2018, a relatively complete skull was reported from Harbin, China, and was described in 2021 as H. longi. Using per generation with a new generation every 29 years, the time is 744,000 years ago. Using nucleotide site per year, it is 616,000 years ago. Using the latter dates, the split had likely already occurred by the time hominins spread out across Europe. H. heidelbergensis is typically considered to have been the direct ancestor of Denisovans and Neanderthals, and sometimes also modern humans. Due to the strong divergence in dental anatomy, they may have split before characteristic Neanderthal dentition evolved about 300,000 years ago. The mtDNA sequence from the femur of a 400,000-year-old early Neanderthal from the Sima de los Huesos Cave in Spain was found to be closer to Denisovans, and the authors posited that this mtDNA represents an archaic sequence which was subsequently lost in Neanderthals due to replacement by a modern-human-related sequence. In 2020, the sequencing of Denisovan Y chromosomes (Denisova 4 and Denisova 8), as well as the Y chromosomes of three late Neanderthals (Spy 94a, Mezmaiskaya 2 and El Sidrón 1253) showed that the Denisovan Y chromosomes split around 700 thousand years ago (kya) from a lineage shared by Neanderthal and modern human Y chromosomes, which diverged from each other around 370 thousand years ago. The phylogenetic relationships of archaic and modern human Y chromosomes differ from the population relationships inferred from the autosomal genomes and mirror mitochondrial DNA phylogenies, indicating replacement of both the mitochondrial and Y chromosomal gene pools in late Neanderthals. == Demographics ==

. Using exponential distribution analysis on haplotype lengths, Jacobs calculated introgression into modern humans occurred about 29,900 years ago with the Denisovan population ancestral to New Guineans; and 45,700 years ago with the population ancestral to both New Guineans and Oceanians. A third wave appears to have introgressed into East Asia, but there is not enough DNA evidence to pinpoint a solid timeframe. In a 2024 study, scientist Danat Yermakovich, of the University of Tartu, discovered that people living at different elevations in Papua New Guinea have differences in Denisovan DNA, with people living in the highlands having variants for early brain development and those living in the lowlands having variants for the immune system. Based on the high percentages of Denisovan DNA in modern Papuans and Australians, Denisovans may have crossed the Wallace Line into these regions (with little back-migration west), the second known human species to do so, along with earlier Homo floresiensis. By this logic, they may also have entered the Philippines, living alongside Homo luzonensis, which, if so, may represent the same or a closely related species. These Denisovans may have needed to cross large bodies of water. Alternately, high Denisovan DNA admixture in modern Papuan populations may simply represent higher mixing among the original ancestors of Papuans prior to crossing the Wallace line. Denisova Cave, over time of habitation, continually swung from a fairly warm and moderately humid pine and birch forest to tundra or forest-tundra landscape. Conversely, Baishiya Karst Cave is situated at a high elevation, an area characterized by low temperature, low oxygen, and poor resource availability. Colonization of high-altitude regions, due to such harsh conditions, was previously assumed to have only been accomplished by modern humans. Denisovans seem to have also inhabited Southeast Asia. The Tam Ngu Hao 2 site might have been a closed forest environment. == Anatomy ==

The finger bone is within the modern human range of variation for women, The Denisovan Harbin cranium, Homo longi is characterized by a low and long skull, receding forehead, extremely wide upper face, a large nasal opening equating to an enlarged nose (possibly an adaptation to the cold air), large and square eye sockets, inflated and thick brow ridges (supraorbital torus), flat cheekbones (zygomatic bone), a wide palate and large tooth sockets (equating to a large mouth), and a broad base of the skull. Because the original describers judged the Harbin skull to be closely allied with the Xiahe mandible, they believed H. longi lacked a chin, like other archaic humans, but the specimen's lower jaw was not recovered. Quoting Rosenberg et al. (2006) the "Reconstructed stature using this formula is 168.78 ± 4.30 cm." "we have used the mean of these two estimates, 78.6 kg, as the estimated body weight". Therefore, we have an estimate of the body proportions, height, and weight of an adult female Denisovan (Homo longi), making it the largest female specimen ever discovered in the fossil record, although within the range of modern human females. The Denisovan genome also contains a variant region around the EPAS1 gene that in Tibetans assists with adaptation to low oxygen levels at high elevation, == Culture ==

Denisova Cave Early Middle Paleolithic stone tools from Denisova Cave included cores, scrapers, denticulate tools, and notched tools, deposited about 287±41 thousand years ago in the Main Chamber of the cave; and about 269±97 thousand years ago in the South Chamber; up to 170±19 thousand and 187±14 thousand years ago in the Main and East Chambers, respectively. Middle Paleolithic assemblages were dominated by flat, discoidal, and Levallois cores, with some isolated sub-prismatic cores. There were predominantly side scrapers (a scraper with only the sides used to scrape), but also notched-denticulate tools, end-scrapers (a scraper with only the ends used to scrape), burins, chisel-like tools, and truncated flakes. These dated to 156±15 thousand years ago in the Main Chamber, 58±6 thousand years ago in the East Chamber, and 136±26–47±8 thousand years ago in the South Chamber. In 1998, five child hand- and footprint impressions were discovered in a travertine unit near the Quesang hot springs in Tibet; in 2021, they were dated to 226 to 169 thousand years ago using uranium decay dating. This is the oldest evidence of human occupation of the Tibetan Plateau, and since the Xiahe mandible is the oldest human fossil from the region (though younger than the Quesang impressions), these may have been made by Denisovan children. The impressions were printed onto a small panel of space, and there is little overlap between all the prints, so they seem to have been taking care to make new imprints in unused space. If considered art, they are the oldest known examples of rock art. Similar hand stencils and impressions do not appear again in the archeological record until roughly 40,000 years ago. The footprints comprise four right impressions and one left superimposed on one of the right. They were probably left by two individuals. The tracks of the individual who superimposed their left onto their right may have scrunched up their toes and wiggled them in the mud, or dug their finger into the toe prints. The footprints average long, which roughly equates to a 7- or 8-year-old child by modern human growth rates. There are two sets of handprints (from a left and right hand), which may have been created by an older child unless one of the former two individuals had long fingers. The handprints average , which roughly equates with a 12-year-old modern human child, and the middle finger length agrees with a 17-year-old modern human. One of the handprints shows an impression of the forearm, and the individual was wiggling their thumb through the mud. == Interbreeding ==

Analyses of the modern human genomes indicate past interbreeding with at least two groups of archaic humans—Neanderthals and Denisovans—and that interbreeding events occurred multiple times. Comparisons of the Denisovan, Neanderthal, and modern human genomes have revealed evidence of a complex web of interbreeding among these lineages. The Denisovan genome shares more derived alleles with the Altai Neanderthal genome from Siberia than with the Vindija Cave Neanderthal genome from Croatia or the Mezmaiskaya cave Neanderthal genome from the Caucasus, suggesting that the gene flow came from a population that was more closely related to the local Altai Neanderthals. Denisova 25, dated to 200 ka, is estimated to have inherited 5% of his genome from a previously unknown population of Neanderthals, and came from a different population of Denisovans than the younger samples. though in 2021 and 2024, specimens allocated to the latter species were reclassified as Homo longi (Denisovan) and Homo juluensis. Modern humans A 2011 study found that Denisovan DNA is present at a comparatively high level in Papuans, Aboriginal Australians, Near Oceanians, Polynesians, Fijians, Eastern Indonesians, and Aeta (from the Philippines); but not in East Asians, western Indonesians, Jahai people (from Malaysia), or Onge (from the Andaman Islands). This may suggest that Denisovan introgression occurred within the Pacific region rather than on the Asian mainland, and that ancestors of the latter groups were not present in Southeast Asia at the time. In the Melanesian genome, about 4–6% Prior to 2021, New Guineans and Indigenous Australians were reported to have the most introgressed DNA, A 2021 study discovered 30–40% more Denisovan ancestry in Aeta people in the Philippines than in Papuans, estimated as about 5% of the genome. The Aeta Magbukon in Luzon have the highest known proportion of Denisovan ancestry of any population in the world. In Papuans, less Denisovan ancestry is seen in the X chromosome than autosomes, and some autosomes (such as chromosome 11) also have less Denisovan ancestry, which could indicate hybrid incompatibility. The former observation could also be explained by less Denisovan introgression into modern humans, or by more female modern human immigrants who diluted Denisovan X-chromosome ancestry. A 2019 study found a third wave of Denisovans that introgressed into East Asians. Introgression, also, may not have immediately occurred when modern humans immigrated into the region. and before Papuan and Aboriginal Australians split from each other roughly 37,000 years ago. Given the present-day distribution of Denisovan DNA, this may have taken place in Wallacea, though the discovery of a 7,200-year-old Toalean girl (closely related to Papuans and Aboriginal Australians) from Sulawesi carrying Denisovan DNA makes Sundaland another potential candidate. Other early Sunda hunter-gatherers so far sequenced carry very little Denisovan DNA, which either means the introgression event did not occur in Sundaland, or that Denisovan ancestry was diluted by gene flow from the mainland Asian Hòabìnhian culture and subsequent Neolithic cultures. A haplotype of EPAS1 in modern Tibetans, which allows them to live at high elevations in a low-oxygen environment, likely came from Denisovans. Denisovan genes may have conferred a degree of immunity against the G614 mutation of SARS-CoV-2. Denisovan introgressions may have influenced the immune system of present-day Papuans and potentially favoured "variants to immune-related phenotypes" and "adaptation to the local environment". In December 2023, scientists reported that genes inherited by modern humans from Neanderthals and Denisovans may biologically influence the daily routine of modern humans. In August 2025, a study reported an archaic haplotype of the MUC19 gene of Denisovan origin which occurs at high frequency in most admixed American populations, and which was also was found in ancient genomes from 23 ancient Indigenous American individuals who predate admixture with Europeans and Africans. This haplotype regulates MUC19 production, which is expressed in corneal and conjunctival epithelia, and the lacrimal gland and shows strong signs of positive selection in modern humans. This haplotype with Denisovan-specific variants is contained in a 72-kb region of the MUC19 gene, but that region is embedded in a larger 742-kb region that contains Neanderthal-specific variants. The authors also found that the Denisovan haplotype was also found in the Chagyrskaya and Vindija late Neanderthals, so the authors conclude that modern humans inherited this haplotype from Neanderthals, who likely inherited it from Denisovans through Denisovan admixture with Neanderthals. A 2025 study of ancient and modern genomes from Eurasia traced the historical route of Denisovan admixture throughout Northern and Western Eurasia. It found that the highest Denisovan admixture was in the 40,000-year-old Tianyuan man from northeast China, the first example of the Ancestral East Asian population. The individuals from Sungir in Russia, dating to 34,000 years ago, also had Denisovan admixture. Tianyuan man contributed Denisovan DNA segments to the individual from Salkhit in Eastern Siberia, and later to the Ancient North Eurasians such as the Mal'ta boy from 24,000 years ago. The Ancient North Eurasians then became the ancestors of the Eastern hunter-gatherers who passed their Denisovan ancestry to the later Proto-Indo-European Yamnaya culture. Therefore, present-day Europeans and Near Easterners also have Denisovan ancestry. However, the study found that the Jōmon people of ancient Japan had much less Denisovan ancestry than all other East Asians. == See also ==