Andossa Likius's research while affiliated with Académie Nationale de Médecine and other places

Publications (82)

Article
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Bipedal locomotion is one of the key adaptations that define the hominin clade. Evidence of bipedalism is known from postcranial remains of late Miocene hominins as early as 6 million years ago (Ma) in eastern Africa1–4. Bipedality of Sahelanthropus tchadensis was hitherto inferred about 7 Ma in central Africa (Chad) based on cranial evidence5–7. H...
Preprint
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Terrestrial bipedal locomotion is one of the key adaptations defining the hominin clade. Evidences of undisputed bipedalism are known from postcranial remains of late Miocene hominins as soon as 6 Ma in eastern Africa. Bipedality of Sahelanthropus tchadensis was hitherto documented at 7 Ma in central Africa (Chad) by cranial evidence. Here, we pres...
Article
Central Africa is known as a major center of diversification for extant Old World Monkeys (OWM) and yet has a poorly documented fossil record of monkeys. Here we report a new colobine monkey (Cercopithecoides bruneti sp. nov.) from the Central African hominin-bearing fossiliferous area of Toros-Menalla, Chad at ca. 7 Ma. In addition to filling a ga...
Article
We investigate the feasibility and potential relevance of studying growth patterns in the bones of fossil freshwater ectotherms with the aim of developing new markers for continental palaeoenvironments and climates. This prospective study is based on Late Neogene material from Chad. It thus provides preliminary results that interest the reconstruct...
Article
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The late Miocene fossil-bearing localities of Toros Menalla (Chad) have yielded a huge amount of vertebrate remains with, in particular, the hominid Sahelanthropus tchadensis Brunet et al., 2002. The order Carnivora is well represented in the fauna (with up to 23 species) and we describe here a new genus and species together with a species not prev...
Article
Camels are exceptionally rare in the Plio-Pleistocene fossil record of Africa, hindering attempts to understand the evolution of this family on the continent. Here we describe recently collected camel specimens from the Shungura Formation, Lower Omo Valley, Ethiopia, and attribute these remains to Camelus grattardi. The new specimens date to the la...
Article
We analyzed phytolith and diatom remains preserved at 45 Miocene and Pliocene localities dated between 8 and 1 Ma in northern Chad (16–17°N). Some of these localities yielded cranial remains, lower jaws, and teeth of the hominin species Australopithecus bahrelghazali (∼3.6 Ma) and Sahelanthropus tchadensis (∼7 Ma). Of the 111 sediment samples analy...
Article
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The analysis of a large sample of anthracothere remains discovered by the Mission Paléoanthropologique Franco-Tchadienne at Toros-Menalla (TM), Northern Chad, has revealed the occurrence of a single species with a large intraspecific morphological variability. Taxonomic problems triggered the necessity of naming a new species for the TM anthracothe...
Article
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During the latest Miocene and the early Pliocene, tetraconodontine suids were the most predominant large omnivorous mammals in Africa. Yet, new species were often identified on the grounds of limited evidence, a situation impacting their value for biochronological correlations as well as for environmental and biogeographical reconstructions. The de...
Article
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Foods derived from C(4) plants were important in the dietary ecology of early Pleistocene hominins in southern and eastern Africa, but the origins and geographic variability of this relationship remain unknown. Carbon isotope data show that Australopithecus bahrelghazali individuals from Koro Toro in Chad are significantly enriched in (13)C, indica...
Article
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The first Mochokus (Siluriformes, Mochokidae) remains of the fossil record are described, including a new species based on a sub-complete neurocranium discovered in the Late Miocene deposits of Toros-Menalla, Chad, Central Africa, dated to 7.0 Ma. Mochokus gigas, sp. nov., is the first fossil species described for the family Mochokidae, which is th...
Article
The late Miocene Hyaenidae of Toros-Menalla (Chad) belong to four different middle or large body size taxa. The large Chasmaporthetes was a hunting predator probably adapted to open environments. The middle sized Hyaenictitherium minimum was the most abundant hyenid; it probably hunted in packs and, with a dentition far less specialized for bone-cr...
Article
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Chad is a key region for understanding early hominid evolution and the related environmental changes of the Late Miocene. We present an extensive study of the freshwater ichthyofauna associated with Toumai, the oldest hominid known so far, at site 266 of the Late Miocene fossiliferous area of Toros-Menalla, northern Chad. Fish diversity was found t...
Article
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The Toros Menalla Late Miocene Formation (7 Ma), Djurab desert, Chad, has yielded a large number of vertebrate remains, and among them around twenty taxa of carnivores. Recent collections allow us to describe two sabre-toothed felids assigned to the genera Lokotunjailurus and cf. Megantereon. The former does exist in the Nawata Formation, Lothagam,...
Article
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The concentrations of atmospheric cosmogenic 10 Be normalized to the solubilized fraction of its stable isotope 9 Be have been measured in the authigenic phase leached from silicated continental sediments deposited since the upper Miocene in the northern Chad Basin. This method is validated by the systematic congruence with the biochronological est...
Article
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This is the first extensive study of a freshwater fish fauna from the Pliocene site of Koro-Toro (Chad), aged 3.58 �+/- 0.27 Ma. The assemblage includes an abafish (Mormyriformes, Gymnarchidae: Gymnarchus), a tigerfish (Characiformes, Alestidae: Hydrocynus), six different catfishes (Siluriformes, Ariidae: Carlarius; Bagridae: Bagrus; Claroteidae: C...
Article
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A diverse assemblage of large mammals is spatially and stratigraphically associated with Ardipithecus ramidus at Aramis. The most common species are tragelaphine antelope and colobine monkeys. Analyses of their postcranial remains situate them in a closed habitat. Assessment of dental mesowear, microwear, and stable isotopes from these and a wider...
Article
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The sites of Kossom Bougoudi (KB) and Kollé (KL) are intermediate in age between the Sahelanthropus sites of Toros Menalla and the Australopithecus sites of Koro Toro, and their bovid faunas are also intermediate in composition and stage of evolution. Four new taxa are erected. The hippotragine Tchadotragus fanonei nov. sp. is more derived than the...
Article
Since the mid 1990s, the Mission paléoanthropologique francotchadienne (MPFT) conducts yearly paleontological field investigations of the Miocene-Pliocene of the Chad Basin. This article synthesizes some of the results of the MPFT, with focus on the Chad Basin development during the Neogene. We propose an overview of the depositional paleoenvironme...
Article
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This is the first extensive study of a freshwater fish fauna from a Pliocene site in Central Africa, based on fossils collected at the KL2 site in the fossiliferous area of Kolle (Lower Pliocene, Chad). A relatively high fish diversity is revealed, confirming the presence of 19 taxa: Polypteriformes, Polypteridae (Polypterus sp.); Osteoglossiformes...
Article
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The Neogene African fossil record of two fishes, i.e. Semlikiichthys (Perciformes indet.) and Calarius (Siluriformes, Ariidae) is reviewed including new material from Chadian outcrops. Their distribution confirms the existence of a Nilo-Sudan ichthyological province. During an early part of the Miocene an east–west waterway is demonstrated to have...
Article
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The Late Miocene fossil vertebrate bearing localities of Toros Menalla (Chad) have yielded specimens of a mustelid belonging to a new genus. The collection comprises several skulls and mandibles, a few vertebrae and fragments of limb bones. This material is compared to extant and extinct mustelids. Its characters show that it is quite different fro...
Article
The fossil vertebrate bearing locality Kossom Bougoudi (KB) is situated in the Djurab desert (Chad, Africa), 600km north-east of N’djamena. It has yielded about 1250 specimens with many mammalian remains, principally artiodactyls. Its geologic age has been estimated to be about 5 Ma by biochronologic estimation and about 5.3 Ma by radiometric studi...
Article
The small-sized feliforms (Viverridae, Herpestidae, Felidae) from the Late Miocene fossiliferous area of Toros-Menalla, Chad, are described. The Viverridae are represented by dental and postcranial remains of two species: a new, large-sized viverrid, Sahelictis korei n. gen. n. sp., which is characterized by a more trenchant dentition than in Viver...
Article
The holotype of the species Australopithecus bahrelghazali is a mandibular fragment preserving left C-P(4) and right I(2)-P(4). One of the key features of the A. bahrelghazali mandible is its sagittally and transversally flat anterior region associated with a vertical, bulbous symphysis that is assumed to differ morphologically from the classic, mo...
Article
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Semlikiichthys is a fossil genus of perciform fish from the Neogene continental deposits of Africa. Until now, it was known in Mio-Pliocene sites of the Great Lake Region and of the River Nile by a single species, S. rhachirhinchus. Here, we describe new Semlikiichthys material recovered from Central Africa (Upper Miocene of Toros-Menalla, western...
Article
We describe extensive Late Miocene fossil Lutrinae from Toros-Menalla, Chad. A minimum of four species are present in this fossiliferous area. Such a large number of species, diverse in size and dental morphology, is significant and unique in the fossil record of the subfamily Lutrinae in the Neogene of Africa. Two new taxa are described, Sivaonyx...
Article
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Ages were determined at two hominid localities from the Chad Basin in the Djurab Desert (Northern Chad). In the Koro Toro fossiliferous area, KT 12 locality (16°00′N, 18°53′E) was the site of discovery of Australopithecus bahrelghazali (Abel) and in the Toros-Menalla fossiliferous area, TM 266 locality (16°15′N, 17°29′E) was the site of discovery o...
Article
Until now, the pre-Pleistocene record of the bovid tribe Hippotragini was rather poor. Two new taxa are described from the late Miocene of Toros-Menalla in northern Chad, which yielded the earliest known hominid, Sahelanthropus tchadensis. Tchadotragus sudrei n.gen. n.sp. is known by complete skulls and numerous horn-cores. It hastypical hippotragi...
Article
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Until now, the pre-Pleistocene record of the bovid tribe Hippotragini was rather poor. We describe here two new taxa from the late Miocene of Toros-Menalla in northern Chad, which yielded the earliest known hominid, Sahelanthropus tchadensis. Tchadotragus sudrei n.gen. n.sp. is known by complete skulls and numerous horn-cores. It has typical hippot...
Article
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We report on the oldest fox (Canidae) ever found in Africa. It is dated to 7 Ma based on the degree of evolution of the whole fauna. It belongs to a new species. Its overall size and some morphological characteristics distinguish the Chadian specimen from all the other foxes. The presence of Vulpes and of the genus Eucyon in slightly younger Africa...
Article
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Late Miocene localities of Toros Menalla (Chad) have yielded many bones of fossil vertebrates with a lot of mammalian remains. Among the mammals, there are several Carnivora taxa, especially hyenids. The family Hyaenidae is very well developed during this period with classical bone crusher species but also with flesh eater taxa which are called hun...
Article
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Three specimens of a fossil catfish, collected from the Upper Miocene of Toros-Menalla (Western Djurab, Chad), are identified as members of Auchenoglanis (Claroteidae, Auchenoglanidinae) based on the shape and the ornamentation of the bones of the skull, including a markedly developed parieto-supraoccipital broadly connected with the first nuchal p...
Article
Des restes fossiles de Giraffidae découverts dans les niveaux du Miocène supérieur de « l’Anthracotheriid Unit » (A.U.) du secteur fossilifère de Toros-Menalla (Nord du Tchad) permettent de proposer une étude descriptive et comparative. Ils sont rapportés au genre Bohlinia, jusque là uniquement connu dans quelques gisements du Miocène supérieur d’E...
Article
The Pliocene continental formations of the paleo-lake Chad system are known because of the recent discovery of the first australopithecine known west of the Rift Valley. The structures under study are found in sandstone levels associated with a rich fauna, including mammals, birds, reptiles and fishes. Analysis of the depositional environment and f...
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Higher termites of the subfamily Macrotermitinae (fungus-growing termites) are known to build fungus gardens where a symbiotic fungus (Termitomyces sp.) is cultivated. The fungus grows on a substrate called fungus comb, a structure built with the termites' own faeces. Here we present the first fossil fungus combs ever found in the world. They were...
Article
A new species of the genus Serengetilagus, here named S. tchadensis n. sp., is described from Toros Menalla deposits, Late Miocene of Djurab Erg (North Chad, central Africa). It shows primitive features, such as a simple archaeolagine-type p3, with only two main external folds, and upper cheek teeth strongly widened with wear. Its size and skeletal...
Article
A new sub-complete specimen of fossil Tubulidentata has been found by the ‘Mission paléoanthropologique franco-tchadienne’ (MPFT) in Chad. After O. abundulafus Lehmann et al., 2005 from Kossom Bougoudi, O. djourabensis Lehmann et al., 2004 from Kollé, it is the first described aardvark from the fossiliferous sector Toros-Menalla. This specimen belo...
Article
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Recent discovery of an abundant and diverse late Miocene fauna at Toros-Ménalla (Chad, central Africa) by the Mission Paléoanthropologique Franco-Tchadienne provides a unique opportunity to examine African faunal and hominid evolution relative to the early phases of the Saharan arid belt. This study presents evidence from an African Miocene anthrac...
Article
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In the Sahara region, the age of onset of the desert condition has been uncertain until now. Here we report on the discovery of 7,000,000-year-old eolian dune deposits from the northern Chad Basin. This geological archive is the oldest known evidence for desert occurrence in the Sahara.
Article
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Polypterus faraou sp. nov. (Cladistia, Polypteridae) from the Late Miocene of Toros-Menalla (western Djourab, Chad) is described on the basis of a subcomplete articulated skeleton preserved in three dimensions. This is the first time such a complete fossil polypterid skeleton has been described. It is the only verifiable fossil record for the genus...
Article
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The recent reconstruction of the Sahelanthropus tchadensis cranium (TM 266-01-60-1) provides an opportunity to examine in detail differences in cranial shape between this earliest-known hominid, African apes, and other hominid taxa. Here we compare the reconstruction of TM 266-01-60-1 with crania of African apes, humans, and several Pliocene homini...
Article
A new species of Hyaenidae, Hyaenictitherium minimum, is described in the carnivore fauna of the Late Miocene layers of Toros-Menalla (Chad). Its size is similar to that of a jackal and it had probably a similar ecological niche. It is found in several fossil-bearing localities of this area. The genus Hyaenictitherium is known from the early Late M...
Article
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Numerous Pliocene large-mammal assemblages have been discovered in Chad over the last decade. They offer a unique opportunity to understand the settings in which important chapters of Hominid evolution took place in Central Africa. However, it is crucial to first investigate both sampling and taxonomic homogeneity for these Chadian assemblages beca...
Article
A new species of Hippopotamidae based on abundant and well-preserved remains was discovered in the late Miocene levels of the Toros-Ménalla fossiliferous area in the Djurab desert, Chad, central Africa. This hippopotamid is contemporaneous with Sahelanthropus tchadensis, a hominid from the same area, with an age of ca. 7.0 Ma. Hexaprotodon garyam s...
Article
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New fossils of the family Ciconiidae from Pliocene hominid localities in Chad and Ethiopia are described, and several are shown to belong to Leptoptilos falconeri, originally known from the late Pliocene of the Siwalik Hills of India. Comparisons with all the hitherto known species of large Ciconiidae, and with an enlarged sample representing extan...
Article
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We report on the earliest modern mongooses of Africa, from the late Miocene (ca. 7 Ma) of the hominid locality TM 266, Toros-Menalla, Chad. The material is based on fragmentary dentitions of three individuals. The main diagnostic feature of the Chadian species is the great development of the shear in the carnassials, which distinguishes the Chadian...
Article
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A new genus and species of swan (subtribe Cygnina) are described here from the late Miocene deposits of Toros Menalla (Chad, Africa), which have yielded the earliest known hominid. Afrocygnus chauvireae, gen. et sp. nov., is about the size of Cygnus atratus of the Australasian region, but differs morphologically from all living members of the genus...
Article
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Previous research in Chad at the Toros-Menalla 266 fossiliferous locality (about 7 million years old) uncovered a nearly complete cranium (TM 266-01-60-1), three mandibular fragments and several isolated teeth attributed to Sahelanthropus tchadensis 1, 2, 3. Of this material, the cranium is especially important for testing hypotheses about the syst...
Article
Carbon isotope composition and micro-wear analyses of tooth enamel were used to reconstruct the diet of late Miocene hippopotamids unearthed in the Toros-Ménalla area, Chad, contemporary to the oldest known hominids. A large sample of wild modern Hippopotamus amphibius from various locations in Africa was also analysed for comparison. Isotopic anal...
Article
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Discoveries in Chad by the Mission Paleoanthropologique Franco-Tchadienne have substantially changed our understanding of early human evolution in Africa. In particular, the TM 266 locality in the Toros-Menalla fossiliferous area yielded a nearly complete cranium (TM 266-01-60-1), a mandible, and several isolated teeth assigned to Sahelanthropus tc...
Article
A new species of fossil Tubulidentata has been found by the Mission Paléoanthropologique Franco-Tchadienne in Northern Chad. It is the first fossil Orycteropodidae (aardvark) from the Mio-Pliocene of Central Africa. The new taxon, Orycteropus abundulafus sp. nov., is considered in the framework of the available Orycteropodidae fossil record. The Ch...
Article
‘Toumaï’, Late Miocene of Chad, the new earliest member of the human branch. The new Chadian hominid Sahelanthropus tchadensis Brunet et al., 2002, nicknamed ‘Toumaï’, recovered by the MPFT (Mission paléoanthropologique franco-tchadienne, scientific collaboration between the University of Poitiers, University of N’Djamena and CNAR, National Center...
Article
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The Pliocene sites of the Djurab region (Chad, Africa) have yielded 19 avian remains. They belong to seven different taxa: a cormorant, Phalacrocorax cf. carbo, a darter, Anhinga cf. melanogaster, a heron (Ardeidae), a Ciconiidae of the tribe Leptoptilini, the size of the extant African species of marabou stork or Saddlebill, an extinct marabou sto...
Article
A fragment of mandible and two metapodials complete unearthed from the fossiliferous aera of Kossom Bougoudi (KB3 and KB26), northern Chad are described. A comparative study allows to assign these specimens to Paracamelus gigas. The evolutionnary degree is compatible with an age around the Mio-Pliocene boundary (ca 5 Ma). Then, the Chadian remains...
Article
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Un fragment de mandibule et deux métapodes complets provenant du secteur fossilifère de Kossom Bougoudi (KB3 et KB26), Nord Tchad sont décrits. Une étude comparative permet d’attribuer les spécimens à Paracamelus gigas. Le degré évolutif des spécimens est compatible avec l’âge biochronologique des sites KB, proche de la limite Mio-Pliocène (ca 5 Ma...
Article
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All six known specimens of the early hominid Sahelanthropus tchadensis come from Toros-Menalla site 266 (TM 266), a single locality in the Djurab Desert, northern Chad, central Africa. Here we present a preliminary analysis of the palaeontological and palaeoecological context of these finds. The rich fauna from TM 266 includes a significant aquatic...
Article
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The search for the earliest fossil evidence of the human lineage has been concentrated in East Africa. Here we report the discovery of six hominid specimens from Chad, central Africa, 2,500 km from the East African Rift Valley. The fossils include a nearly complete cranium and fragmentary lower jaws. The associated fauna suggest the fossils are bet...
Article
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Since 1994 the ‘‘Mission Paleoanthropologique Franco-Tchadienne’’ (M.P.F.T.) has conducted several seasons of field research in the Djurab desert of northern Chad, resulting in the discovery of more than one hundred Mio-Pliocene vertebrate fossil sites. The discovery in the Koro Toro region (KT12; Brunet et al., 1995, 1996) of a new species of aust...

Citations

... O fêmur, para alguns, é similar aos dos chimpanzés, que obviamente não são bípedes (Macchiarelli et al., 2020), ao passo que para outros (Daver et al., 2022) ele era similar aos dos humanos atuais. Os ossos dos braços falam a favor de que era exímio trepador de árvores, como todos os primeiros hominínios até 2 milhões de anos, como já vimos (Daver et al., 2022). ...
... We find the TM 266 cranium and ulna fall securely within the expected size relationships between a given primate cranium and its associated ulna, strongly supporting that the fossils represent a single individual. The cranium was initially reported as a biped based on a set of hominin synapomorphies, including a shortened basioccipital, a relatively short premaxilla with no diastema, and a more anteriorly positioned foramen magnum Guy et al., 2005Guy et al., , 2020Zollikofer et al., 2005). The claim for bipedality was met with immediate pushback on the grounds that the interpretations were flawed; the highly distorted skull was reconstructed with a combination of a very large nuchal plane and an orthognathic face, a combination that is anatomically incongruous, and the foramen magnum position does not classify locomotion and posture across primates as this is dependent on evolutionary trends other than locomotion (Wolpoff et al., 2002(Wolpoff et al., , 2006Landi et al., 2020). ...
... or snake-birds (Aves, Suliformes, Anhingidae) are today represented by a single morphologically defined genus with two species (Beddard 1892, Harrison 1978, Brodkorb & Mourer-Chauviré 1982, Olson 1985, Becker 1986, 1987, Louchart et al. 2004, Worthy 2012: Anhinga anhinga Linnaeus, 1766 andA. melanogaster Pennant, 1769. ...
... Bilophodonty has been suggested to have originated in a seedeating context, with the lophs acting as wedges in the breakdown of very tough (Lucas and Teaford, 1994) and/or hard food items (Benefit, 1999). Molecular data suggest a final divergence between Colobus and Piliocolobus between 9.0 and 7.5 Ma (Roos and Zinner, 2022), roughly coinciding with an increase in leaf consumption for colobines in the Late Miocene (Pallas et al., 2019). Perhaps as these two genera diverged, selection acted to reduce flare in Piliocolobus, enhancing the shearing function of its molars (as per Shimizu, 2002). ...
... The relationship between ectotherm's growth and isolated biotic and abiotic factors has been largely studied in multiple fields, for instance, developmental biology (Green & Fisher, 2004), ecology (e.g., Beckman et al., 1998;Rosenfeld et al., 2005), development of animal resources (Boeuf & Payan, 2001;Deane & Woo, 2009;Norberg et al., 2001), and paleontology or archaeology, to interpret the growth of animals as a paleoenvironmental proxy (Lapalus et al., 2018). Fossil growth patterns can aid in the evaluation of paleoenvironmental seasonal fluctuations, which are an important component of climate effects on past continental ecosystems (e.g., Tonkin et al., 2017;White & Hastings, 2020). ...
... iScience Article Chad, 7 Ma. 88 Bonis et al. 88 noticed the similarity of their new genus to Yoshi and stated that Tchadailurus is different from Yoshi in smaller size, proportionally higher canine, and longer diastema. In other aspects, this genus is much like Yoshi and unlike other metailurine, in having a high crowned P3, without an anterior accessory cusp and a transversely elongated M1. ...
... Уже в конце плиоцена -начале плейстоцена в Африке, судя по всему, появляются представители рода Camelus, базальным видом которого является C. grattardi Geraads, 2014 (Geraads, 2014;Geraads et al., 2021). После проникновения в Азию потомки этого вида, вероятно, и дали начало линии, ведущей к появлению двугорбых верблюдов C. ferus/ bactrianus (Rowan et al., 2019;Geraads et al., 2021). В конце раннего и начале среднего плейстоцена на территории Северной Африки обитал C. thomasi Pomel, 1893, который, скорее всего, тоже не является прямым предком одногорбого верблюда C. dromedarius L., 1758. ...
... Without a thorough understanding of the phytolith production patterns of these taxa, it is not possible to say to what degree they are present in the study area. Applying the aridity index in spite of the above problems gives values of 61.5% or higher for the semi-desert samples as well as for some steppes, easily breaking the threshold of 20% set by Bremond et al. (2005b) for indicating aridity, or the 27.8% threshold by Novello et al. (2017). In addition, LDA results reveal a strong statistical relationship between semi-desert and the abundances of Saddle, mainly expressed on axis 3. ...
... We obtained data from the literature 40,44,50,122,[128][129][130][131][132][133][134][135][136] to represent two more traits relevant to functional diversity and ecometrics: hypsodonty and longitudinal loph count. Together these traits illustrate a species' dentition and dietary adaptations. ...
... Discrete characters were deemed the most important in this particular research; accordingly, resulting figures were oriented and scaled to the same size in linear dimensions to carry out sizeindependent comparisons of interspecific characters. Characters considered follow the standard terminology of Palacios and López Martínez (1980), were described in Appendix I of Ruedas (1998) and illustrated here ( Figure 1) with some modifications from Ruedas et al. (2017) in that all cusps are identified by incorporating features from López Martínez (1974,1977,1980,1989), López-Martínez et al. (2007), and Angelone and Sesé (2009). Additional characters useful in distinguishing among lagomorph species were extracted from Palacios (1996) and Palacios et al. (2008). ...