Fossil evidence for the origin of the marsupial pattern of tooth replacement

Cifelli, Richard L.; Rowe, Timothy; Luckett, W. Patrick; Banta, James T.; Reyes, Reuben; Howes, Ruth

doi:10.1038/379715a0

Cited by 68 publications

(33 citation statements)

References 9 publications

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“…Birth of very vulnerable offspring and development of pouches presumably evolved in parallel, so it is reasonable to infer that ancestral marsupials produced better-developed offspring after longer gestation periods. The peculiar dental eruption sequence found in all modern and even early fossil marsupials (Lillegraven et al 1987;Cifelli et al 1996) is undoubtedly a secondary specialization. It is most convincingly interpreted as an adaptation to an extended period of teat attachment.…”

Section: Reconstructing the Evolution Of Placenta Typesmentioning

confidence: 99%

Evolution of Placentation in Primates: Implications of Mammalian Phylogeny

Martín

2008

Evol Biol

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Primates are quite unique among placental mammals in that the two extreme types of placentation are present within a single order. Strepsirrhines (lemurs and lorisiforms) have non-invasive epitheliochorial placentation, whereas haplorhines (tarsiers and higher primates) have highly invasive haemochorial placentation. Resemblance in placenta type in fact provided the first evidence that tarsiers are linked to higher primates and distinct from lemurs and lorisiforms. Tree-shrews differ from both primate subgroups in having moderately invasive endotheliochorial placentation, while colugos have invasive haemochorial placentation like haplorhines. All three kinds of placentation have been identified as primitive for placentals by different authors, but until recently the prevailing interpretation has been that non-invasive epitheliochorial placentation is primitive and ''less efficient''. Opposing this interpretation, Martin (Primate origins and evolution: a phylogenetic reconstruction, 1990) proposed that moderately invasive endotheliochorial placentation is primitive. Epitheliochorial placentation is unlikely to be primitive because it is predominantly associated with large body size, relatively long gestation periods and precocial offspring. Furthermore, some strepsirrhines and other placental mammals with epitheliochorial placentation retain indications of former invasiveness of the placenta. The recent availability of comprehensive molecular phylogenies for placental mammals has provided an independent framework to determine the most parsimonious interpretation of the evolution of placenta types and other reproductive features. It has consistently emerged that epitheliochorial placentation is best explained as a derived condition, although opinions differ as to whether the ancestral condition for placental mammals (and hence for primates) was endotheliochorial or haemochorial. It is argued that on balance the most likely ancestral condition is endotheliochorial. Comparative evidence across placentals clearly indicates that epitheliochorial placentation is not less efficient than more invasive forms of placentation, at least with respect to growth in overall fetal body mass. The ratio of neonate mass to gestation period (a simple indicator of average daily maternal investment in fetal growth) shows no difference according to placenta type. Differential evolution of placentation is hence presumably linked to immunological factors, parent/offspring conflict and/or genomic imprinting.

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Section: Reconstructing the Evolution Of Placenta Typesmentioning

confidence: 99%

Evolution of Placentation in Primates: Implications of Mammalian Phylogeny

Martín

2008

Evol Biol

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“…The generalized condition among marsupials and basal stem taxa, such as Alphadon, Pucadelphys and sparassodonts, is that the P3/p3 erupts and emerges at about the same time as the M4/m4 (Cifelli et al 1996;Cifelli & Muizon 1998;van Nievelt & Smith 2005;Astúa & Leiner 2008;Forasiepi 2009). Among South American marsupials, the living Paucituberculata (i.e.…”

Section: Tooth Eruption Sequencementioning

confidence: 99%

A unique, Late Oligocene shrew-like marsupial from western Argentina and the evolution of dental morphology

Forasiepi

Goin

Abello

et al. 2013

Journal of Systematic Palaeontology

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(2014). A unique, Late Oligocene shrew-like marsupial from western Argentina and the evolution of dental morphology. Journal of Systematic Palaeontology, 12(5):549-564. DOI: https://doi.org/10. 1080/14772019.2013.799611 This article was downloaded by: [ PLEASE SCROLL DOWN FOR ARTICLETaylor & Francis makes every effort to ensure the accuracy of all the information (the "Content") contained in the publications on our platform. However, Taylor & Francis, our agents, and our licensors make no representations or warranties whatsoever as to the accuracy, completeness, or suitability for any purpose of the Content. Any opinions and views expressed in this publication are the opinions and views of the authors, and are not the views of or endorsed by Taylor & Francis. The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content. This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. Terms & Conditions of access and use can be found at http:// www.tandfonline.com/page/terms-and-conditions We describe a new metatherian mammal, Fieratherium sorex gen. et sp. nov., found in western Argentina (Quebrada Fiera locality, southern Mendoza Province), in Late Oligocene deposits (Agua de la Piedra Formation, Deseadan age). The only known specimen is a juvenile with fragments of both dentaries, the right maxilla and a fragment of the left premaxilla with dentition. The loci and the number teeth preserved suggest a dental formula of I?3/i3, C1/c1, P3/p3, M?3/m?3. Fieratherium sorex has a convergent shrew-like appearance and a unique combination of features among metatherians and other South American mammals of Palaeogene age, including the well-known faunas of Patagonia. An analysis of its phylogenetic affinities suggests that Fieratherium is the sister-group of the Paucituberculata. As already described by other authors for several mammalian taxa, the mainly Patagonian South American Palaeogene fossil record offers little information to understanding the evolution of northern lineages. Fieratherium may represent a taxon belonging to a lineage that had its origin in Neotropical regions, so far unrecorded in the southern region of South America.http://zoobank.org/urn:lsid:zoobank.org:pub:5F6D3A50-6345-4E66-BE3E-7FEF6CC66A9B

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“…Some of the more informative characters on the skull pertain to the ear region, and in particular the petrosal (Wible, 1990;Rougier et al, 1998). In addition, a dental replacement pattern of only P3/p3 is present in extant marsupials as well as some nonmarsupial metatherians (Cifelli et al, 1996;Cifelli and de Muizon, 1998;Rougier et al, 1998), indicating that this character is an apomorphy for a more inclusive clade than crown Marsupialia.…”

Section: Introductionmentioning

confidence: 99%

Comparative Morphology of the Internal Nasal Skeleton of Adult Marsupials Based on X-ray Computed Tomography

Macrini

2012

Bulletin of the American Museum of Natural History

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Fossil evidence for the origin of the marsupial pattern of tooth replacement

Cited by 68 publications

References 9 publications

Evolution of Placentation in Primates: Implications of Mammalian Phylogeny

Evolution of Placentation in Primates: Implications of Mammalian Phylogeny

A unique, Late Oligocene shrew-like marsupial from western Argentina and the evolution of dental morphology

Comparative Morphology of the Internal Nasal Skeleton of Adult Marsupials Based on X-ray Computed Tomography

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