Temporal range: 0.6–0.2 Ma Middle Pleistocene
Homo heidelbergensis – also Homo rhodesiensis – is an extinct species of the genus Homo that lived in Africa, Europe and western Asia between 600,000 and 200,000 years ago. The skulls of this species share features with both Homo erectus and anatomically modern Homo sapiens; its brain was nearly as large as that of Homo sapiens. Although the first discovery – a mandible – was made in 1907 near Heidelberg in Germany where it was described and named by Otto Schoetensack, "the great majority of fossils attributed to Homo heidelbergensis have [only] been obtained recently, beginning in 1997." The Sima de los Huesos cave at Atapuerca in northern Spain holds particularly rich layers of deposits that "represent an exceptional reserve of data" where excavations are still in progress.
Neanderthals, Denisovans, and modern humans are all considered to have descended from Homo heidelbergensis that appeared around 700,000 years ago in Africa. Fossils have been recovered in Ethiopia, Namibia and South Africa. Between 300,000 and 400,000 years ago a group of Homo heidelbergensis migrated into Europe and West Asia via yet unknown routes and eventually evolved into Neanderthals. Archaeological sites exist in Spain, Italy, France, England, Germany, Hungary and Greece. Another Homo heidelbergensis group ventured eastwards into continental Asia, eventually developing into Denisovans. The African Homo heidelbergensis (Homo rhodesiensis) population evolved into Homo sapiens approximately 130,000 years ago, then migrated into Europe and Asia in a second wave at some point between 125,000 and 60,000 years ago.
The correct assignment of many fossils to a particular chronospecies is difficult and often controversies ensue among paleoanthropologists due to the absence of universally accepted dividing lines (autapomorphies) between Homo erectus, Homo heidelbergensis and Neanderthals. Some researchers suggest that the finds associated to Homo heidelbergensis are mere variants of Homo erectus.
- 1 Morphology and interpretations
- 2 Divergent evolution
- 3 Fossils
- 4 See also
- 5 References
- 6 Further reading
- 7 External links
Morphology and interpretations
Both Homo antecessor and Homo heidelbergensis are likely to have descended from the morphologically very similar Homo ergaster from Africa. But because H. heidelbergensis had a larger brain-case – with a typical cranial volume of approximately 1250 cm³ – and had more advanced tools and behavior, it has been given a separate species classification. "The anatomy [of H. heidelbergensis] is clearly more primitive than that of Neanderthal, but the harmoniously rounded dental arch and the complete row of teeth...already typically human."
The muddle in the middle
For more than half a century many experts were reluctant to accept Homo heidelbergensis as a separate taxon due to the rarity of specimens, which prevented sufficient informative morphological comparisons and the distinction of H. heidelbergensis from other known human species. The species name "heidelbergensis" only experienced a renaissance with the many discoveries of the past 30 years and appears now to be recognized by an increasing number of researchers. Yet some researchers hold the contrary view that the evolutionary development in Africa and Europe was a gradual process from H. erectus via the findings assigned to H. heidelbergensis towards Neanderthal. Any form of segregation is considered arbitrary, which is why these researchers forgo the name H. heidelbergensis altogether. Paleoanthropologists often refer to the uncertainties surrounding the specimens, their dating and morphology, as “the muddle in the middle.”
The fact that there seem to be no clear transitions makes it difficult to draw up a list of unique characteristics of H. heidelbergensis that distinguishes it from H. erectus and H. neanderthalensis. In general, the findings show a continuation of evolutionary trends that are emerging from around the Lower into Middle Pleistocene. Along with changes in the robustness of cranial and dental features, a remarkable increase in brain size from H. erectus towards H. heidelbergensis is noticeable.
Male H. heidelbergensis averaged about 1.75 m (5 ft 9 in) tall and 62 kg (136 lb). Females averaged 1.57 m (5 ft 2 in) and 51 kg (112 lb). A reconstruction of 27 complete human limb bones found in Atapuerca (Burgos, Spain) has helped to determine the height of H. heidelbergensis compared with H. neanderthalensis; the conclusion was that these H. heidelbergensis averaged about 170 cm (5 ft 7in) in height and were only slightly taller than Neanderthals. According to Lee R. Berger of the University of Witwatersrand, numerous fossil bones indicate some populations of H. heidelbergensis were "giants" routinely over 2.13 m (7 ft) tall and inhabited South Africa between 500,000 and 300,000 years ago.
The "nature of our object" reveals itself "at first sight" since "a certain disproportion between the jaw and the teeth" is obvious: "The teeth are too small for the bone. The available space would allow for a far greater flexibility of development" and "It shows a combination of features, which has been previously found neither on a recent nor a fossil human mandible. Even the scholar should not be blamed if he would only reluctantly accept it as human: Entirely missing is the one feature, which is regarded as particularly human, namely an outer projection of the chin portion, yet this deficiency is found to be combined with extremely strange dimensions of the mandibular body. The actual proof that we are dealing with human parts here only lies within the nature of the dentition. The completely preserved teeth bear the stamp 'human' as evidence: The canines show no trace of a stronger expression in relation to the other groups of teeth. They suggest a moderate and harmonious co-evolution, as it is the case in recent humans."
Steven Mithen believes that H. heidelbergensis, like its descendant H. neanderthalensis, acquired a pre-linguistic system of communication. No forms of art have been uncovered, although red ochre, a mineral that can be used to mix a red pigment which is useful as a paint, has been found at Terra Amata excavations in the south of France.
The morphology of the outer and middle ear suggests they had an auditory sensitivity similar to modern humans and very different from chimpanzees. They were probably able to differentiate between many different sounds. Dental wear analysis suggests they were as likely to be right-handed as modern people.
H. heidelbergensis was a close relative (most probably a migratory descendant) of Homo ergaster. H. ergaster is thought to be the first hominid to vocalize, and that as H. heidelbergensis developed, more sophisticated culture proceeded from this point.
Evidence of hunting
A 300,000 years old archeological site in Schöningen, Germany contained eight exceptionally well-preserved spears for hunting, and various other wooden tools. Five-hundred-thousand-year-old hafted stone points used for hunting are reported from Kathu Pan 1 in South Africa, tested by way of use-wear replication. This find could mean that modern humans and Neanderthals inherited the stone-tipped spear, rather than developing the technology independently.
The original Homo erectus who lived approximately 700,000 years ago evolved into a new human species with a much bigger brain who used well-manufactured stone tools (known as the Acheulean culture) which, in a second propagation wave (out of Africa II theory), subsequently migrated to southern Europe, including Germany and England. All representatives of this more advanced human species are classified as Homo heidelbergensis. Their robust build and excellent hunting tools appeared to be well suited to dealing with the climate fluctuations in Europe. H. heidelbergensis hominids evolved into the Neanderthals approximately 250,000 to 300,000 years ago during the Wolstonian Stage.
Because of the migration of H. heidelbergensis out of Africa and into Europe, the two populations were mostly isolated during the Wolstonian Stage and Ipswichian Stage, the last of the prolonged Quaternary glacial periods. H. sapiens probably diverged between 200,000 and 100,000 years ago in Africa. Such fossils as the Atapuerca skull in Spain and the Kabwe skull in modern-day Zambia bear witness to the two branches of the H. heidelbergensis tree. Thus, "the picture emerging is one of Homo erectus as a widespread, polytypic species, with groups persisting longer in some regions than in others. The pattern documented in China and especially in Java contrasts with that in the West, where Homo erectus seems to disappear from the record at a relatively early date".
Homo neanderthalensis retained most of the features of Homo heidelbergensis after its divergent evolution. Although shorter, Neanderthals were more robust, had large brow-ridges, a slightly protruding face, and lack of prominent chin. With a virtually identical cranial capacity to Cro-Magnon, they also had a larger brain than all other hominids. Homo sapiens, on the other hand, have the smallest brows of any known hominid, are taller and more gracile, and have a flat face with a protruding chin. H. sapiens have a larger brain than H. heidelbergensis, and a smaller brain than H. neanderthalensis, on average. To date, H. sapiens is the only known hominid with a high forehead, flat face, and thin, flat brows.
Today's researchers, such as Chris Stringer consider it justifiable to declare Homo heidelbergensis as an independent chronospecies, as some used to hold the view that it is a cladistic ancestor to other Homo forms, sometimes improperly linked to distinct species in terms of populational genetics.
In 2013 researchers published sequenced DNA from fossils in the Sima de los Huesos cave in the Atapuerca Mountains, all classified as members of H. heidelbergensis and thought to have given rise to Neanderthal. "The  fossils’ identity suddenly became complicated when a study of the maternally inherited mitochondrial DNA (mtDNA) from one of the bones revealed that it did not resemble that of a Neanderthal. Instead, it more closely matched the mtDNA of a Denisovan...".
In an article of 2015, Matthias Meyer of the Max Planck Institute for Evolutionary Anthropology states: “Indeed, the Sima de los Huesos specimens are early Neanderthals or related to early Neanderthals,” after his team had scanned this DNA for markers found only in Neanderthals, Denisovans or modern humans, they found that the nuclear genomes of those specimens were significantly more similar to Neanderthals. "And that suggests the Neanderthal-Denisovan split happened before 430,000 years ago".
Some scenarios of survival include:
- H. heidelbergensis > H. neanderthalensis 
- H. heidelbergensis > Homo sp. (Denisovans)
- H. heidelbergensis > Homo rhodesiensis > Homo sapiens idaltu > H. sapiens sapiens 
The first fossil discovery of this species was made on October 21, 1907, and came from Mauer, Germany. Here, the workman Daniel Hartmann spotted a jaw in a sandpit. The jaw (Mauer 1) was in good condition except for the missing premolar teeth, which were eventually found near the jaw. The workman gave it to Professor Otto Schoetensack from the University of Heidelberg, who identified and named the fossil.
The next H. heidelbergensis remains were found in Steinheim an der Murr, Germany (the Steinheim Skull, 350kya); Arago, France (Arago 21); Petralona, Greece; Ciampate del Diavolo, Italy; Dali, Jinniushan and Maba (Guangdong), China. In 1925–1926 Francis Turville-Petre unearthed the "Galilee skull" at Mugharet el-Zuttiyeh in Israel, which was the first ancient hominid fossil found in Western Asia.
Kabwe 1, also called the Broken Hill skull, was assigned by Arthur Smith Woodward in 1921 as the type specimen for Homo rhodesiensis; today most scientists now assign it to Homo heidelbergensis. The cranium was found in a lead and zinc mine in Broken Hill, Northern Rhodesia (now Kabwe, Zambia) in 1921 by Tom Zwiglaar, a Swiss miner. In addition to the cranium, an upper jaw from another individual, a sacrum, a tibia, and two femur fragments were also found. The skull was dubbed "Rhodesian Man" at the time of the find, but is now commonly referred to as the Broken Hill skull or the Kabwe cranium.
Saldanha cranium or Elandsfontein cranium are fossilized remains of a hominid species considered to be Homo heidelbergensis. The remains were found in 1954 in Elandsfontein, located in the Hopefield of South Africa. To date it remains the southernmost hominid find.
In a 1997 study, the skull has been termed as to be "enigmatic", because "it exhibits a mosaic of characteristics, that typify H. erectus, Neanderthals, H. sapiens" and "has been attributed by different workers to H. erectus, H. heidelbergensis, H. sapiens..." As the Greek government disallows research, debate on the skull's age and taxon has been going on in the scientific community for more than half a century.
On 22 July 1971 near the village of Tautavel in Pyrénées-Orientales, the team of Prof. Henry de Lumley discovered a 450,000 year old human skull following seven years of excavations in a mountain cave called Caune de l'Arago. Since the discovery of Tautavel Man (Homo erectus tautavelensis), annual excavations have revealed more than one hundred human fossils, making this cave one of the largest prehistoric deposits in the world. The skeletons at Tautavel are among the oldest human remains ever discovered in Europe. The Arago Cave, very close to the village, was occupied periodically between 690,000 and 35,000 years ago. Although scientist do not explicitly relate these finds to H. heidelbergensis, morphological characteristics are those of humans who preceded Neanderthal.
The Bodo cranium was found by members of an expedition led by Jon Kalb in 1976 at Bodo D'ar, Awash River valley of Ethiopia. The initial discovery - a lower face - was made by Alemayhew Asfaw and Charles Smart. Two weeks later, Paul Whitehead and Craig Wood found the upper portion of the face. The skull is 600,000 years old.
In 1994 British scientists unearthed a lower hominin tibia bone of Boxgrove Man a few miles away from the English Channel, along with hundreds of ancient hand axes, at the Boxgrove Quarry site. This partial leg bone is dated to between 478,000 and 524,000 years old. Several H. heidelbergensis teeth were also found in subsequent seasons. H. heidelbergensis was the early proto-human species that occupied both France and Great Britain at that time; these locales were connected by a landmass during that epoch.
The tibia had been gnawed by a large carnivore, suggesting that the man had been killed by a lion or wolf, or that his unburied corpse had been scavenged after death.
Sima de los Huesos
Beginning in 1992, a Spanish team has located more than 5,500 human bones dated to an age of at least 350,000 years in the Sima de los Huesos site in the Sierra de Atapuerca in northern Spain. The pit contains fossils of perhaps 32 individuals together with remains of Ursus deningeri and other carnivores and a biface nicknamed Excalibur. It is hypothesized that this Acheulean axe made of red quartzite was some kind of ritual offering for a funeral. If it is so, it would be the oldest evidence of known of funerary practices. Ninety percent of the known H. heidelbergensis remains have been obtained from this site. The fossil pit bones include:
- A complete cranium (skull 5), nicknamed Miguelón, and fragments of other crania, such as skull 4, nicknamed Agamemnón and skull 6, nicknamed Rui (from El Cid, a local hero).
- A complete pelvis (pelvis 1), nicknamed Elvis, in remembrance of Elvis Presley.
- Mandibles, teeth, and many postcranial bones (femurs, hand and foot bones, vertebrae, ribs, etc.)
Nearby sites contain the only known and controversial Homo antecessor fossils.
There is current debate among scholars whether the remains at Sima de los Huesos are those of H. heidelbergensis or early H. neanderthalensis. In 2015, the study of nuclear DNA samples from three caves Sima de los Huesos revealed that was found to be "distantly related to the mitochondrial DNA of Denisovans rather than to that of Neanderthals."
In 2005 flint tools and teeth from the water vole Mimomys savini, a key dating species, were found in the cliffs at Pakefield near Lowestoft in Suffolk. This suggests that hominins can be dated in England to 700,000 years ago, potentially a cross between H. antecessor and H. heidelbergensis.
The Schöningen Spears are eight wooden throwing spears from the Palaeolithic Age, that were found under the management of Dr. Hartmut Thieme from the Lower Saxony State Service for Cultural Heritage (NLD) between 1994 and 1998 in the open-cast lignite mine, Schöningen, county Helmstedt, Germany, together with approx. 16,000 animal bones. More than 300,000 years old, they are the oldest completely preserved hunting weapons in the world and they are regarded as the first evidence of the active hunt by H. heidelbergensis. These discoveries have permanently changed the picture of the cultural and social development of early man.
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