Two human species shared the same hunting grounds at the same time
Beneath the loess of northern China, two distinct human lineages once shared the same ancient landscape — a discovery that quietly dismantles the long-held image of human evolution as a single, orderly procession. A newly dated fossil places Homo juluensis between 138,000 and 228,000 years ago, overlapping almost precisely with the presence of Homo longi, the so-called Dragon Man, in the same region. The finding, published in Quaternary Science Reviews, suggests that East Asia during the Middle Pleistocene was not a corridor of succession but a living mosaic of human diversity — a reminder that our origins were never as simple as we wished them to be.
- For decades, Homo juluensis languished in scientific ambiguity, its age disputed and its significance underestimated — a ghost species haunting the edges of the human story.
- Uranium-series dating of five fossils and co-buried horse bones has finally anchored this hominin to a precise window: 138,000 to 228,000 years ago, with the strongest signal clustering around 150,000 years.
- That date collides directly with Homo longi's known presence in northern China, forcing researchers to confront the reality that two morphologically distinct human species occupied the same territory simultaneously.
- The question of how these lineages related to each other — and to the enigmatic Denisovans — remains open, pulling geneticists and paleoanthropologists into the same unresolved conversation.
- East Asia is being redrawn as a complex hub of Middle Pleistocene humanity, where the family tree branched and overlapped rather than marched forward in a single file.
Un fósil de casi 150.000 años ha devuelto a China al centro de uno de los debates más fundamentales de la ciencia: ¿cómo fue realmente la evolución humana, y dónde ocurrió?
El espécimen pertenece al Homo juluensis, un homínido de notable capacidad craneal descubierto en la provincia de Hebei en los años setenta. Durante décadas, estos restos permanecieron en los márgenes de la paleoantropología, víctimas de lo que los investigadores llaman «el embrollo del medio»: ese tramo turbio de la prehistoria humana donde el registro fósil se llena de especímenes difíciles de clasificar y métodos de datación que arrojaban resultados contradictorios. No fue hasta 2024 cuando se propuso formalmente al Homo juluensis como especie diferenciada, reabriendo el interés por este período crítico del Pleistoceno Medio.
El nuevo estudio, publicado en Quaternary Science Reviews, aplicó datación por series de uranio a cinco fósiles humanos y a restos de fauna —concretamente huesos de caballo enterrados en la misma capa sedimentaria—. Los resultados fueron precisos: el Homo juluensis vivió entre hace 138.000 y 228.000 años, con la mayor concentración de probabilidad en torno a los 150.000 años.
Esa fecha importa de manera decisiva porque coincide casi exactamente con la presencia de otro homínido en la misma región: el Homo longi, conocido como el Hombre Dragón. La evidencia sugiere que al menos dos linajes humanos morfológicamente distintos habitaron el mismo territorio al mismo tiempo. No se trata de una progresión lineal de una forma a otra, sino de coexistencia real.
Las implicaciones reconfiguran nuestra comprensión de Asia Oriental durante este período. En lugar de una historia simple de sustitución gradual, el registro fósil apunta ahora a un paisaje de diversidad genuina, donde varias ramas del árbol genealógico humano crecían simultáneamente. La relación exacta entre ambas especies sigue sin resolverse, al igual que su posible vínculo con los denisovanos —esa misteriosa especie hermana conocida principalmente a través del ADN recuperado de unos pocos fragmentos óseos en Siberia—. Lo que sí queda claro es que la evolución humana en Asia fue un tapiz de poblaciones superpuestas, cada una con su propia trayectoria, muy lejos de la secuencia ordenada que los libros de texto solían presentar.
A fossil nearly 150,000 years old has pulled China back into the center of a fundamental scientific argument: what did human evolution actually look like, and where did it happen?
The specimen in question belongs to Homo juluensis, a hominin with a notably large cranial capacity that was first discovered in Hebei Province during the 1970s. For decades, these remains sat in the background of paleoanthropology, generating disagreement among researchers but never quite commanding the attention they deserved. The problem was simple but vexing: nobody could agree on how old the fossils actually were. Different dating methods produced wildly different ages, making Homo juluensis a textbook example of what scientists call "the muddle in the middle"—that murky stretch of human prehistory where the fossil record becomes crowded with hard-to-classify specimens and competing theories about who lived when.
It wasn't until 2024 that researchers formally proposed Homo juluensis as a distinct human species, reigniting serious interest in this critical period of the Middle Pleistocene. The new study, published in Quaternary Science Reviews, applied uranium-series dating to five human fossils and to animal remains found in the same sedimentary layer—specifically horse bones that had been buried alongside the hominin material. The results were precise: Homo juluensis lived between 138,000 and 228,000 years ago, with the most likely timeframe clustering around 150,000 years.
That date matters enormously because it overlaps almost exactly with the presence of another hominin in the same region: Homo longi, better known as Dragon Man. This creature, which lived roughly 150,000 years ago in northern China, has become one of the most intriguing figures in recent paleoanthropological discovery. The new evidence suggests that at least two morphologically distinct human lineages—two species with visibly different anatomical features—inhabited the same territory at the same time. This was not a linear progression from one form to another. This was coexistence.
The implications reshape how we understand East Asia during this period. Rather than a simple story of one human species gradually replacing another, the fossil record now points to a landscape of genuine diversity, a region where multiple branches of the human family tree were growing simultaneously. The two species were different enough to be classified separately, yet similar enough that they shared the same hunting grounds and resources.
The exact relationship between Homo juluensis and Homo longi remains unresolved. Recent research has confirmed that Dragon Man carried genetic links to the Denisovans, a mysterious sister species to modern humans known primarily through DNA recovered from a few bone fragments in Siberia. Homo juluensis shows anatomical features that might place it on that same Denisovan branch, though the evidence is not yet conclusive. What is clear is that the picture of human evolution in Asia is far more complicated than earlier models suggested—a tapestry of overlapping populations, each with its own trajectory, rather than the neat sequence textbooks once implied.
Notable Quotes
The data support the coexistence of at least two morphologically distinct human lineages in the same region during the Middle Pleistocene.— Study authors in Quaternary Science Reviews
The Hearth Conversation Another angle on the story
Why does it matter that two human species lived in the same place at the same time? Doesn't that happen in nature all the time?
It does, but not usually with us. We're used to thinking of human evolution as a relay race—one species hands off to the next. Finding two distinct human lineages sharing the same territory suggests something messier and more interesting: competition, possibly interbreeding, definitely a much richer ecological picture than we had before.
The dating seems to be the real breakthrough here. Why was that so hard to figure out before?
Different dating methods measure different things and have different margins of error. Uranium-series dating is particularly reliable for bone, but it requires pristine samples and careful lab work. For decades, researchers had conflicting results, so Homo juluensis just sat there—real, but unplaceable in time.
And now that we know when they lived, what changes?
Now we can ask whether they actually encountered each other, whether they competed for the same prey, whether they interbred. We can start building a real picture of what that landscape looked like instead of guessing.
What about the Denisovan connection? Is that just speculation?
Not entirely. We have Denisovan DNA from a few fossils in Siberia, and we know modern humans in Asia carry Denisovan genes. Dragon Man definitely has that connection confirmed. Homo juluensis might too, but we'd need ancient DNA to be sure, and that's much harder to extract from older specimens.
So this is really just the beginning of understanding this period?
Exactly. We have better dating now, which is huge. But the real questions—how these species related to each other, what they looked like, how they behaved—those are still mostly open.