Homo luzonensis

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Homo luzonensis
Temporal range: Late Pleistocene,
0.067–0.05  Ma
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LuzonensisMolars.jpg
CCH6a–e, molar and premolar teeth
Homo luzonensis metatarsal.jpg
CCH1, a 67,000 year old third metatarsal bone
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Haplorhini
Infraorder: Simiiformes
Family: Hominidae
Subfamily: Homininae
Tribe: Hominini
Genus: Homo
Species:
H. luzonensis
Binomial name
Homo luzonensis
Détroit et al., 2019 [1]

Homo luzonensis, also locally called "Ubag" after a mythical caveman, [2] [3] is an extinct, possibly pygmy, species of archaic human from the Late Pleistocene of Luzon, the Philippines. Their remains, teeth and phalanges, are known only from Callao Cave in the northern part of the island dating to before 50,000 years ago. They were initially identified as belonging to modern humans in 2010, but in 2019, after the discovery of more specimens, they were placed into a new species based on the presence of a wide range of traits similar to modern humans as well as to Australopithecus and early Homo . In 2023, a study revealed that the fossilized remains of the Callao Man has been found out to be (134,000 ± 14,000) years old [4] and much older than previously known.

Their ancestors, who may have been Asian H. erectus or some other even earlier Homo, would have needed to have made a sea crossing of several miles [lower-alpha 1] at minimum to reach the island. Archaic human presence on Luzon dates to as early as 771,000 to 631,000 years ago. [5] The inhabitants of the cave dragged in mainly Philippine deer carcasses, and used tools for butchering.

Taxonomy

Interior of Callao Cave, Luzon, the Philippines Callao Cave.jpg
Interior of Callao Cave, Luzon, the Philippines

The first remains were discovered in 2007 in Callao Cave in Northern Luzon, the Philippines. In 2010, French anthropologist Florent Détroit  [ fr ] and Filipino archaeologist Armand Mijares and colleagues identified them as belonging to modern humans. [6] In 2019, after the discovery of 12 new specimens and based on the apparent presence of both modern-humanlike and primitive Australopithecus -like features, they reassigned the remains (and other hominin findings from the cave) to a new species, Homo luzonensis, the specific name deriving from the name of the island. [1]

The holotype, CCH6, comprises the upper right premolars and molars. The paratypes are: CCH1, a right third metatarsal bone of the foot; CCH2 and CCH5, two phalanges of the fingers; CCH3 and CCH4, two phalanges of the foot; CCH4, a left premolar; and CCH9, a right third molar. CCH7 represents a juvenile femoral shaft. These represent at least three individuals. The specimens are kept at the National Museum of the Philippines, Manila. [1]

The exact taxonomic placement of H. luzonensis is unknown, and, like for other tropical hominins, DNA extraction failed. [1] It is possible that—like what is hypothesized for H. floresiensis from Flores, Indonesia—H. luzonensis descended from an early H. erectus dispersal across Southeast Asia. It is also possible that these two insular archaic humans descend from an entirely different Homo species possibly earlier than H. erectus. [7] [8] The bones were dated to before 50,000 years ago, [1] and there is evidence of hominin activity on the island as early as 771,000 – 631,000 years ago. [5]

Anatomy

Comparison of teeth (above) and foot phalanges (below) of A. afarensis (left), H. luzonensis (center), and modern humans (right) Homo luzonensis teeth and foot bones diagram.jpg
Comparison of teeth (above) and foot phalanges (below) of A. afarensis (left), H. luzonensis (center), and modern humans (right)

Like other endemic fauna on Luzon, as well as H. floresiensis, H. luzonensis may have shrunk in size due to insular dwarfism. However, more complete remains are needed to verify size. [1] [9] Much like H. floresiensis, H. luzonensis presents a number of characteristics more similar to Australopithecus and early Homo than to modern humans and more recent Homo. [1]

The teeth of H. luzonensis are small and mesiodistally (the width of the tooth) shortened. The molars are smaller than those of H. floresiensis. Like other recent Homo and modern humans, the molars decrease in size towards the back of the mouth, and the enamel-dentin juncture lacks well defined wavy crenulations. The enamel-dentine juncture is most similar to that of Asian H. erectus. The premolars are oddly large compared to the molars, with more similar proportions to Paranthropus than any other Homo, though H. luzonensis postcanine teeth differ greatly from those of Paranthropus in size and shape. H. luzonensis premolars share many characteristics with those of Australopithecus, Paranthropus, and early Homo. [1]

The finger bones are long, narrow, and curved, which is seen in Australopithecus, H. floresiensis, and sometimes modern humans. They are dorso-palmarly (from the palm to the back of the hand) compressed, and have well developed flexor sheath attachment, which are seen in Australopithecus and the early H. habilis . Unique to H. luzonensis, the dorsal beak near the knuckle was strongly developed and angled towards the wrist rather than the finger. The foot bones are morphologically unique among Homo, and are distinguishable from those of A. africanus and A. afarensis . Australopithecus limbs are generally interpreted as being adaptations for bipedalism and potentially suspensory behavior in the trees, but the fragmentary record of H. luzonensis limits extrapolation of locomotory behavior. [1]

Since the remains are so fragmentary, it is difficult to make accurate estimates of actual size for this species, but they may have been within the range of modern day Philippine Negritos, who average 151 cm (4 ft 11 in) in height for males and 142 cm (4 ft 8 in) for females. [8]

Culture

The ancestors of H. luzonensis crossed the Huxley Line into the Philippines. Map of Sunda and Sahul 2.png
The ancestors of H. luzonensis crossed the Huxley Line into the Philippines.

Because Luzon has always been an island in the Quaternary, the ancestors of H. luzonensis would have had to have made a substantial sea crossing over the Huxley Line. [1]

About 90% of the bone fragments from Callao Cave belong to the Philippine deer, which suggests that deer carcasses were periodically brought into the cave. With the exception of Palawan (where there were tigers), there is no evidence of large carnivores ever inhabiting the Philippines during the Pleistocene, which attributes these remains to human activity. The Philippine warty pig and an extinct bovid were also present. There are cut marks on a deer tibia, and a lack of tools in the cave could either have resulted from the use of organic material for tools rather than stone, or the processing of meat away from the cave. [10]

The Rizal Archaeological Site situated in Rizal, Kalinga, Philippines and within an area that has been subject to archaeological explorations since the 1950s, yielded an almost complete skeleton of a rhino (the extinct Nesorhinus philippinensis ), which had been butchered by early hominins c. 709,000 years ago. Together with the rhinoceros skeleton, six lithic cores, forty-nine lithic flakes, and two hammerstones, were found at the Rizal site. Some cores and the used lithic raw material show a similarity to the chert assemblage from the Lower Paleolithic Arubo 1 site in central Luzon. [11] [12] Also present were the remains of the elephant-relative Stegodon , the Philippine deer, freshwater turtles, and monitor lizards. [5]

See also

Notes

  1. Given that this crossing may have happened at any time over the course of a few 10s of millennia, many failed or successful phases or methods of transference may have occurred. The means by which these hominids ultimately arrived on Luzon is not a settled question but their establishment of permanent residence and subsequent isolation there is now well established. See ancient maritime history for more.

Related Research Articles

<span class="mw-page-title-main">Homininae</span> Subfamily of mammals

Homininae, also called "African hominids" or "African apes", is a subfamily of Hominidae. It includes two tribes, with their extant as well as extinct species: 1) the tribe Hominini ―and 2) the tribe Gorillini (gorillas). Alternatively, the genus Pan is sometimes considered to belong to its own third tribe, Panini. Homininae comprises all hominids that arose after orangutans split from the line of great apes. The Homininae cladogram has three main branches, which lead to gorillas and to humans and chimpanzees. There are two living species of Panina and two living species of gorillas, but only one extant human species. Traces of extinct Homo species, including Homo floresiensis have been found with dates as recent as 40,000 years ago. Organisms in this subfamily are described as hominine or hominines.

<i>Paranthropus</i> Contested extinct genus of hominins

Paranthropus is a genus of extinct hominin which contains two widely accepted species: P. robustus and P. boisei. However, the validity of Paranthropus is contested, and it is sometimes considered to be synonymous with Australopithecus. They are also referred to as the robust australopithecines. They lived between approximately 2.9 and 1.2 million years ago (mya) from the end of the Pliocene to the Middle Pleistocene.

<i>Homo rudolfensis</i> Extinct hominin from the Early Pleistocene of East Africa

Homo rudolfensis is an extinct species of archaic human from the Early Pleistocene of East Africa about 2 million years ago (mya). Because H. rudolfensis coexisted with several other hominins, it is debated what specimens can be confidently assigned to this species beyond the lectotype skull KNM-ER 1470 and other partial skull aspects. No bodily remains are definitively assigned to H. rudolfensis. Consequently, both its generic classification and validity are debated without any wide consensus, with some recommending the species to actually belong to the genus Australopithecus as A. rudolfensis or Kenyanthropus as K. rudolfensis, or that it is synonymous with the contemporaneous and anatomically similar H. habilis.

<i>Homo</i> Genus of hominins that includes humans and their closest extinct relatives

Homo is a genus of great ape that emerged from the genus Australopithecus and encompasses the extant species Homo sapiens and a number of extinct species classified as either ancestral to or closely related to modern humans, including Homo erectus and Homo neanderthalensis. The oldest member of the genus is Homo habilis, with records of just over 2 million years ago. Homo, together with the genus Paranthropus, is probably most closely related to the species Australopithecus africanus within Australopithecus. The closest living relatives of Homo are of the genus Pan, with the ancestors of Pan and Homo estimated to have diverged around 5.7-11 million years ago during the Late Miocene.

<i>Homo floresiensis</i> Archaic human from Flores, Indonesia

Homo floresiensis( also known as "Flores Man") is an extinct species of small archaic human that inhabited the island of Flores, Indonesia, until the arrival of modern humans about 50,000 years ago.

<i>Australopithecus africanus</i> Extinct hominid from South Africa

Australopithecus africanus is an extinct species of australopithecine which lived between about 3.3 and 2.1 million years ago in the Late Pliocene to Early Pleistocene of South Africa. The species has been recovered from Taung, Sterkfontein, Makapansgat, and Gladysvale. The first specimen, the Taung child, was described by anatomist Raymond Dart in 1924, and was the first early hominin found. However, its closer relations to humans than to other apes would not become widely accepted until the middle of the century because most had believed humans evolved outside of Africa. It is unclear how A. africanus relates to other hominins, being variously placed as ancestral to Homo and Paranthropus, to just Paranthropus, or to just P. robustus. The specimen "Little Foot" is the most completely preserved early hominin, with 90% of the skeleton intact, and the oldest South African australopith. However, it is controversially suggested that it and similar specimens be split off into "A. prometheus".

<i>Paranthropus aethiopicus</i> Extinct species of hominin of East Africa

Paranthropus aethiopicus is an extinct species of robust australopithecine from the Late Pliocene to Early Pleistocene of East Africa about 2.7–2.3 million years ago. However, it is much debated whether or not Paranthropus is an invalid grouping and is synonymous with Australopithecus, so the species is also often classified as Australopithecus aethiopicus. Whatever the case, it is considered to have been the ancestor of the much more robust P. boisei. It is debated if P. aethiopicus should be subsumed under P. boisei, and the terms P. boisei sensu lato and P. boisei sensu stricto can be used to respectively include and exclude P. aethiopicus from P. boisei.

<i>Australopithecus garhi</i> Extinct hominid from the Afar Region of Ethiopia 2.6–2.5 million years ago

Australopithecus garhi is a species of australopithecine from the Bouri Formation in the Afar Region of Ethiopia 2.6–2.5 million years ago (mya) during the Early Pleistocene. The first remains were described in 1999 based on several skeletal elements uncovered in the three years preceding. A. garhi was originally considered to have been a direct ancestor to Homo and the human line, but is now thought to have been an offshoot. Like other australopithecines, A. garhi had a brain volume of 450 cc (27 cu in); a jaw which jutted out (prognathism); relatively large molars and premolars; adaptations for both walking on two legs (bipedalism) and grasping while climbing (arboreality); and it is possible that, though unclear if, males were larger than females. One individual, presumed female based on size, may have been 140 cm tall.

<i>Paranthropus robustus</i> Extinct species of hominin of South Africa

Paranthropus robustus is a species of robust australopithecine from the Early and possibly Middle Pleistocene of the Cradle of Humankind, South Africa, about 2.27 to 0.87 million years ago. It has been identified in Kromdraai, Swartkrans, Sterkfontein, Gondolin, Cooper's, and Drimolen Caves. Discovered in 1938, it was among the first early hominins described, and became the type species for the genus Paranthropus. However, it has been argued by some that Paranthropus is an invalid grouping and synonymous with Australopithecus, so the species is also often classified as Australopithecus robustus.

<i>Paranthropus boisei</i> Extinct species of hominin of East Africa

Paranthropus boisei is a species of australopithecine from the Early Pleistocene of East Africa about 2.5 to 1.15 million years ago. The holotype specimen, OH 5, was discovered by palaeoanthropologist Mary Leakey in 1959 at Olduvai Gorge, Tanzania and described by her husband Louis a month later. It was originally placed into its own genus as "Zinjanthropus boisei", but is now relegated to Paranthropus along with other robust australopithecines. However, it is also argued that Paranthropus is an invalid grouping and synonymous with Australopithecus, so the species is also often classified as Australopithecus boisei.

<span class="mw-page-title-main">Callao Cave</span> Cave and archaeological site in the Philippines

Callao Cave is one of 300 limestone caves located in the Barangays of Magdalo and Quibal in the municipality of Peñablanca, about 24 km (15 mi) northeast of Tuguegarao City, the capital of Cagayan province within the Peñablanca Protected Landscape and Seascape in the western foothills of the Northern Sierra Madre Mountains on Luzon island in the Philippines. The town Peñablanca's name refers to the predominance of white limestone rock formations in the area. First excavated in 1980 by Maharlika Cuevas, the seven-chamber show cave is the best known natural tourist attraction of the Cagayan province and in February 2020 has officially been recognized as an important cultural property of the Philippines.

Human taxonomy is the classification of the human species within zoological taxonomy. The systematic genus, Homo, is designed to include both anatomically modern humans and extinct varieties of archaic humans. Current humans have been designated as subspecies Homo sapiens sapiens, differentiated, according to some, from the direct ancestor, Homo sapiens idaltu.

<span class="mw-page-title-main">Australopithecine</span> Extinct subtribe of the Hominini tribe, and members of the human clade

Australopithecina or Hominina is a subtribe in the tribe Hominini. The members of the subtribe are generally Australopithecus, and it typically includes the earlier Ardipithecus, Orrorin, Sahelanthropus, and (sometimes) Graecopithecus. All these closely related species are now sometimes collectively termed australopiths or homininians. They are the extinct, close relatives of modern humans and, together with the extant genus Homo, comprise the human clade. Members of the human clade, i.e. the Hominini after the split from the chimpanzees, are now called Hominina.

<span class="mw-page-title-main">Postcanine megadontia</span> Relative enlargement of pre-molars and molars compared with other teeth.

Post-canine megadontia is a relative enlargement of the molars and premolars compared to the size of the incisors and canines. This phenomenon is seen in some early hominid ancestors such as Paranthropus aethiopicus.

<i>Homo erectus</i> Extinct species of archaic human

Homo erectus is an extinct species of archaic human from the Pleistocene, with its earliest occurrence about 2 million years ago. Its specimens are among the first recognizable members of the genus Homo.

<i>Australopithecus sediba</i> Two-million-year-old hominin from the Cradle of Humankind

Australopithecus sediba is an extinct species of australopithecine recovered from Malapa Cave, Cradle of Humankind, South Africa. It is known from a partial juvenile skeleton, the holotype MH1, and a partial adult female skeleton, the paratype MH2. They date to about 1.98 million years ago in the Early Pleistocene, and coexisted with Paranthropus robustus and Homo ergaster / Homo erectus. Malapa is interpreted as having been a natural death trap, the base of a long vertical shaft which creatures could accidentally fall into. A. sediba was initially described as being a potential human ancestor, and perhaps the progenitor of Homo, but this is contested and it could also represent a late-surviving population or sister species of A. africanus which had earlier inhabited the area.

<span class="mw-page-title-main">Red Deer Cave people</span> Prehistoric humans from 12,500 BCE in southwest China

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<i>Homo naledi</i> South African archaic human species

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<span class="mw-page-title-main">Archaic humans in Southeast Asia</span>

The region of Southeast Asia is considered a possible place for the evidence of archaic human remains that could be found due to the pathway between Australia and mainland Southeast Asia, where the migration of multiple early humans has occurred out of Africa. One of many pieces of evidence is of the early human found in central Java of Indonesia in the late 19th century by Eugene Dubois, and later in 1937 at Sangiran site by G.H.R. van Koenigswald. These skull and fossil materials are Homo erectus, named Pithecanthropus erectus by Dubois and Meganthropus palaeojavanicus by van Koenigswald. They were dated to c. 1.88 and 1.66 Ma, as suggested by Swisher et al. by analysis of volcanic rocks.

<span class="mw-page-title-main">Armand Mijares</span> Filipino archaeologist (born 1966)

Armand Salvador B. Mijares is a Filipino archaeologist from Manila, Philippines. He works as Professor of Archaeology at the Archaeological Studies Program of the University of the Philippines-Diliman. He specializes in lithic analysis, ceramic petrology, soil micromorphology, paleolithic archaeology and early human migration in Southeast Asia. In 2010, Mijares gained international attention as the main author of a Journal of Human Evolution report about a 67,000-year old foot bone discovered in Callao Cave. That report gave evidence for the newly named species of Homo, called Homo luzonensis, named after the Philippines' largest island—Luzon. The discovery has advanced the complexity of early human colonization of Southeast Asia.

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