Australopithecus aethiopicus

''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 ("in the broad sense") and ''P. boisei'' sensu stricto ("in the strict sense") can be used to respectively include and exclude ''P. aethiopicus'' from ''P. boisei''.

Like other ''Paranthropus'', ''P. aethiopicus'' had a tall face, thick palate, and especially enlarged cheek teeth. However, likely due to its archaicness, it also diverges from other ''Paranthropus'', with some aspects resembling the much earlier '' A. afarensis''. ''P. aethiopicus'' is known primarily by the skull KNM WT 17000 from West Turkana, Kenya, as well as some jawbones from Koobi Fora; the Shungura Formation, Ethiopia; and Laetoli, Tanzania. These locations featured bushland to open woodland landscapes with edaphic (water-logged) grasslands.

Taxonomy

Research history

In 1968, French palaeontologist Camille Arambourg and Breton anthropologist Yves Coppens described "''Paraustralopithecus aethiopicus''" based on a toothless mandible (Omo 18) from the Shungura Formation, Ethiopia. The name ''aethiopicus'' refers to Ethiopia. In 1976, American anthropologist Francis Clark Howell and Coppens reclassified it as ''A. africanus''.

In 1985, the skull KNM WT 17000 dating to 2.5 million years ago was reported from Koobi Fora, Lake Turkana, Kenya, by anthropologists Alan Walker and Richard Leakey. A partial jawbone from a different individual, KNM-WT 16005, was also discovered. They clearly belonged to a robust australopithecine. By this point in time, much younger robust australopithecines had been reported from South Africa ('' robustus'') and East Africa ('' boisei''), and been variously assigned to either ''Australopithecus'' or a unique genus ''Paranthropus''. Walker and Leakey assigned KNM WT 17000 to the ''boisei'' clade. They noted several anatomical differences, but were unsure if this stemmed from the specimens' archaicness or represented the normal range of variation for the species. If the former, they recommended classifying them and similar specimens into a different species, ''aethiopicus'' (and recommended that ''Paraustralopithecus'' be invalid). The discovery of these archaic specimens overturned previous postulations that ''P. robustus'' was the ancestor of the much more robust ''P. boisei'' (a hypothesis notably argued by palaeoanthropologist in 1985) by establishing the ''boisei'' lineage as beginning long before ''robustus'' had existed.

In 1989, palaeoartist Walter Ferguson recommended KNM WT 17000 be classified into a different species, ''walkeri'', because the holotype of ''aethiopicus'' comprised only the jawbone and KNM WT 17000 preserves no jaw elements. Ferguson's classification is almost universally ignored, and is considered to be synonymous with ''P. aethiopicus''.

Several more lower and upper jaw specimens have been unearthed in the Shungura Formation, including a juvenile specimen, L338y-6. In 2002, a 2.7–2.5 Ma maxilla, EP 1500, from Laetoli, Tanzania, was assigned to ''P. aethiopicus''. Also found was the upper portion of a tibia, but it cannot definitively be associated with EP 1500 and thus with ''P. aethiopicus''.

Classification

The genus ''Paranthropus'' (from Ancient Greek παρα ''para'' beside or alongside, and άνθρωπος ''ánthropos'' man, otherwise known as "robust australopithecines") typically includes ''P. aethiopicus'', ''P. boisei'', and ''P. robustus''. ''P. aethiopicus'' is the earliest member of the genus, with the oldest remains, from the Ethiopian Omo Kibish Formation, dated to 2.6 million years ago (mya) at the end of the Pliocene and a few jaws and isolated teeth, and is generally considered to have been ancestral to ''P. boisei'' which also inhabited East Africa, making it a chronospecies. Because of this relationship, it is debatable if ''P. aethiopicus'' should be subsumed under ''P. boisei'' or if the differences stemming from archaicness should justify species distinction. The terms ''P. boisei sensu lato'' ("in the broad sense") and ''P. boisei sensu stricto'' ("in the strict sense") can be used to respectively include and exclude ''P. aethiopicus'' from ''P. boisei'' when discussing the lineage as a whole.

It is also debated if ''Paranthropus'' is a valid natural grouping (monophyletic) or an invalid grouping of similar-looking hominins (paraphyletic). Because skeletal elements are so limited in these species, their affinities with each other and to other australopithecines is difficult to gauge with accuracy. The jaws are the main argument for monophyly, but such anatomy is strongly influenced by diet and environment, and could in all likelihood have evolved independently in ''P. boisei'' and ''P. robustus''. Proponents of monophyly consider ''P. aethiopicus'' to be ancestral to the other two species, or closely related to the ancestor. Proponents of paraphyly allocate these three species to the genus ''Australopithecus'' as ''A. boisei'', ''A. aethiopicus'', and ''A. robustus''. British geologist Bernard Wood and American palaeoanthropologist William Kimbel are major proponents of monophyly, and against include Walker.

This species, originally named ''Paraustralopithecus aethiopicus'', cannot retain the species epithet ''aethiopicus'' if moved to genus ''Australopithecus'' because ''Australopithecus aethiopicus'' is already a junior synonym of ''Australopithecus afarensis''. Such a classification would have to use the name ''Australopithecus walkeri'' for this species. The change of species epithet would also happen in a taxonomy that classifies all hominins as ''Homo''.

Description

Typical of ''Paranthropus'', KNM WT 17000 is heavily built, and the palate and base of the skull are about the same size as the ''P. boisei'' holotype OH 5. The brain volume of KNM WT 17000 was estimated to have been , which is smaller than that of other ''Paranthropus''. The combination of a tall face, thick palate, and small braincase caused a highly defined sagittal crest on the midline of the skull. The only complete tooth crown of the specimen is the right third premolar, whose dimensions are well above the range of variation for ''P. robustus'' and on the upper end for ''P. boisei''. Unlike other ''Paranthropus'', KNM WT 17000 did not have a flat face, and the jaw jutted out (prognathism). In regard to the temporal bone, KNM WT 17000 differs from other ''Paranthropus'' in that the squamous part of temporal bone is extensively pneumaticised, the tympanic part of the temporal bone is not as vertically orientated, the base of the skull is weakly flexed, the postglenoid process is completely anterior to (in front of) the tympanic, the tympanic is somewhat tubular, and the articular tubercle is weak. Like ''P. boisei'', the foramen magnum where the skull connects to the spine is heart-shaped. The temporalis muscle was probably not directed as forward as it was in ''P. boisei'', meaning the ''P. aethiopicus'' jaw likely processed food with the incisors before using the cheek teeth. The incisors of ''P. boisei'' are thought to have not been involved in processing food. The long distance between the first molar and the jaw hinge would suggest KNM WT 17000 had an exceptionally long ramus of the mandible (connecting the lower jaw to the skull), though the hinge's location indicates the ramus would not have been particularly deep (it would have been weaker). This may have produced a less effective bite compared to ''P. boisei''.

KNM-WT 16005 is quite similar to the Peninj Mandible assigned to ''P. boisei'', exhibiting postcanine megadontia with relatively small incisors and canines (based on the tooth roots) and large cheek teeth. Nonetheless, the incisors were likely much broader in KNM-WT 16005. KNM-WT 16005 preserved four cheek teeth on the left side: the third premolar measuring , the fourth premolar measuring , the first molar measuring , and the second molar measuring . The fourth premolar and first molar are a little smaller than those of the Peninj mandible, and the second molar a bit bigger. The KNM-WT 16005 jawbone is smaller than what KNM WT 17000 would have had.

Many of these ''P. aethiopicus'' features are shared with the early '' A. afarensis'', further reiterating the species' archaicness.

Palaeoecology

In general, ''Paranthropus'' are thought to have been generalist feeders, with the heavily built skull becoming important when chewing less desirable, lower quality foods in times of famine. Unlike ''P. boisei'' which generally is found in the context of closed, wet environments, ''P. aethiopicus'' seems to have inhabited bushland to open woodland habitats around edaphic (water-logged) grasslands. Around 2.5 million years ago, at the Pliocene border, the Omo–Turkana Basin featured a mix of forests, woodlands, grasslands, and bushlands, though grasslands appear to have been expanding through the Early Pleistocene. ''Homo'' seems to have entered the region 2.5–2.4 million years ago.

See also

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References

External links

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Human Timeline (Interactive)
– Smithsonian, National Museum of Natural History (August 2016).

{{Taxonbar, from=Q310517

Paranthropus
Pliocene primates
Fossil taxa described in 1968
Prehistoric Kenya
Pleistocene mammals of Africa
Pleistocene primates