Diatomyidae
| Diatomyidae Временный диапазон: Ранний олигоцен - недавний
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| Молодая самец лаосская крыса , лаонаст Эенигмамус | |
Научная классификация 
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| Домен: | Эукариота |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Rodentia |
| Suborder: | Hystricomorpha |
| Superfamily: | Ctenodactyloidea |
| Family: | Diatomyidae Mein & Ginsburg, 1997 |
| Type genus | |
| Diatomys Li, 1974
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| Genera | |
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Laonastes | |
| Synonyms | |
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Laonastidae Jenkins et al. 2005 | |
Diatomyidae - это семейство грызунов Histricomorph. Он представлен одним живым видом, Laonastes Aenigmamus , родом из Лаоса в Юго -Восточной Азии. Ископаемые виды известны из олигоцена и миоцена Азии и Восточной Европы.
"Эффект Лазаря"
[ редактировать ]До того, как был обнаружен Laonastes , семейство Diatomyidae было известно только по окаменелостям . Семейство имеет почти непрерывный диапазон ископаемого от ранних олигоценовых окаменелостей Фалломуса из низшей формы Chitarwata (32,5 миллиона лет назад, член Bugti, Bugti Hills , [ 1 ] [ 2 ] ) в Белуджистане , Пакистане , до средних/поздних миоценовых окаменелостей (11 млн лет) диатомий .
Jenkins et al. [ 3 ] сообщил об открытии совершенно уникального нового вида грызунов, Laonastes Aenigmamus , для которого они создали новое семейство Laonastidae . Они предположили, что это был грызун Hystricognath , но базально для всех других гистрикогнов. Доусон и др. [ 4 ] переоценил филогенетическое положение лаонастов и включало в на основе морфологии себя ископаемые таксоны в их анализе. Они определили, что лаонаст на самом деле наука и принадлежит Diatomyidae. Они также описали Diatomomidae как таксон из Лазаря из-за 11-миллионного года между последним диатомиидом в ископаемом отчете и существованием Laonastes сегодня. Единственным другим сопоставимым временем для таксона Lazarus Marmal является Monito del Monte , который является частью семейства ( Microbiotheriidae ), также недавно известный из миоценовых отложений. Мэри Доусон описала Лаонаст как « Колакант грызунов». [5]
Characteristics
[edit]The Diatomyidae are similar to both the Ctenodactylidae and the Anomaluromorpha in being simultaneously hystricomorphous and sciurognathous. The masseteric fossa in diatomyids is enlarged and extends to below the first cheek tooth. The enamel on incisors is multiserial (similar to the springhare, gundis, and Hystricognathi). The single premolar on both the upper and lower tooth rows is enlarged (unlike the reduced state in Ctenodactylidae). Most diatomyids have cheek teeth with four roots except for the first. In Laonastes, the lower molars have four roots, but upper cheek teeth have three roots including a U-shaped anterior root that may be derived from the merging of two roots.
Living diatomyids are only represented by the Laotian rock rat from the Khammouan region of Laos. Fossil diatomyids have been recovered in Pakistan, India, Thailand, China, Japan, and Serbia.[6]
Relationship to other rodents
[edit]The uniqueness of the Laotian rock rat was clear upon its initial discovery. The results of the phylogenetic analyses[3] were somewhat inconclusive and contradictory. Both morphological and molecular studies suggested Laonastes is a member of the rodent suborder Hystricognathi. The morphological analysis suggested it is the most basal hystricognath. Fossil taxa were not included in the morphological analysis.
Analysis of mtDNA 12S rRNA and cytochrome b sequence, however, suggested Laonastes might be related to living African hystricognaths such as the dassie rat and the naked mole rat. Another type of analysis on the cytochrome b sequence data produced the same result as morphology. Neither analysis, however, showed entirely robust statistical support for the position of Laonastes within the hystricognaths; altogether, it appeared to belong among the basal African radiation.
Dawson et al.[4] also refuted the notion that Laonastes is a hystricognath and instead argued that the mandible is sciurognathous. They evaluated Laonastes in comparison to several fossil rodents and determined it is closely related to the diatomyids, particularly Diatomys. Their results suggested the Diatomyidae are a sister group to the Ctenodactylidae, and this diatomyid/ctenodactylid clade (along with the Yuomyidae) is sister to the Hystricognathi.
Besides Laonastes, other diatomyids have also been placed in different families. Some [7][8] placed Diatomys in the family Pedetidae (springhares). Others[9] considered Fallomus to belong to the Chapattimyidae (a completely fossil group). The family Diatomyidae was erected and considered to be a member of the superfamily Ctenodactyloidea.[7] Marivaux et al.[10] united the two into a single family (Diatomyidae), but also suggested this family might be related to the Pedetidae.
Dawson's fossil study[4] was corroborated by more comprehensive DNA sequence analyses,[11] which suggested a roughly Lutetian (about 44 Mya, Early/Middle Eocene) divergence date between the ancestors of the Laotian rock rat and the African gundis, which are each other's closest living relatives. Considering the present-day distribution, the fossil record, and Eocene paleogeography, this divergence probably took place in one of three regions. Either the lineages split in Eurasia, somewhere in today's Zagros Mountains or adjacent ranges of the Alpide belt. These at that time formed a rugged and broken coastline with many offshore islands, as they emerged from the shrinking Tethys Sea.[12] Alternatively, the entire Ctenodactyloidea might be of African origin, or the lineage split took place on India as it joined the Asian mainland, with the gundis reaching Africa via the Mascarene Plateau's archipelagos and island continents.[13] Each hypothesis would unite the paleontological, anatomical, and molecular findings into a robust model. Which one is preferred depends on whether the Hystricomorpha were Laurasian or Gondwanan in origin.
Species
[edit]- †Fallomus
- †Diatomys
- †Marymus
- †Pierremus[14]
- †Willmus
- †Inopinatia
- Laonastes
- Laonastes aenigmamus - Laotian rock rat
References
[edit]- ^ Marivaux, L. & Welcomme, J.-L. 2003. New diatomyid and baluchimyine rodents from the Oligocene of Pakistan (Bugti Hills, Balochistan): Systematic and paleobiogeographic implications. Journal of Vertebrate Paleontology 23:420-434.
- ^ Flynn, L. J., L. L. Jacobs, and I. U. Cheema. 1986. Baluchimyinae, a new ctenodactyloid subfamily from the Miocene of Baluchistan. American Museum Novitates, 2841:1-58.
- ^ Jump up to: a b Jenkins, Paulina D.; Kilpatrick, C. William; Robinson, Mark F. & Timmins, Robert J. (2004): Morphological and molecular investigations of a new family, genus and species of rodent (Mammalia: Rodentia: Hystricognatha) from Lao PDR. Systematics and Biodiversity 2(4): 419-454. doi:10.1017/S1477200004001549 (HTML abstract). Erratum: Systematics and Biodiversity 3(3):343. doi:10.1017/S1477200005001775
- ^ Jump up to: a b c Dawson, M. R., L. Marivaux, C.-k. Li, K. C. Beard, and G. Métais. 2006. Laonastes and the "Lazarus effect" in Recent mammals. Science, 311:1456-1458.
- ^ "Back from the dead: Living fossil identified". NBC News. 9 March 2006.
- ^ Marković, Zoran; Wessels, Wilma; van de Weerd, Andrew A.; de Bruijn, Hans (2018-09-01). "On a new diatomyid (Rodentia, Mammalia) from the Paleogene of south-east Serbia, the first record of the family in Europe". Palaeobiodiversity and Palaeoenvironments. 98 (3): 459–469. doi:10.1007/s12549-017-0301-4. ISSN 1867-1608. PMC 6417379. PMID 30956714.
- ^ Jump up to: a b Mein, P. and L. Ginsburg, L. 1985. Les rongeurs miocènes de Li (Thailande). Compte Rendus de l’Académie des Sciences, Paris, Série II, 301:1369-1374.
- ^ McKenna, Malcolm C., and Bell, Susan K. 1997. Classification of Mammals Above the Species Level. Columbia University Press, New York, 631 pp. ISBN 0-231-11013-8
- ^ Flynn, L. J. and M. E. Morgan. 2005. An Unusual Diatomyid Rodent from an Infrequently Sampled Late Miocene Interval in the Siwaliks of Pakistan, Palaeontologia Electronica Vol. 8, Issue 1; 17A:10p, [1][permanent dead link]
- ^ Marivaux, L., M. Vianey-Liaud, and J.-J. Jaeger. 2004. High-level phylogeny of early Tertiary rodents: dental evidence. Zoological Journal of the Linnean Society, 142:105-134.
- ^ Huchon, Dorothée; Chevret, Pascale; Jordan, Ursula; Kilpatrick, C. William; Ranwez, Vincent; Jenkins, Paulina D.; Brosius, Jürgen & Schmitz, Jürgen (2007): Multiple molecular evidences for a living mammalian fossil. PNAS 104(18): 7495-7499. doi:10.1073/pnas.0701289104 (HTML abstract)
- ^ Marivaux, L. J. L. Welcomme, M. Vianey-Liaud, and J.J. Jaeger. 2002. The role of Asia in the origin and diversification of hystricognathous rodents. Zoologica Scripta, 31:225-239.
- ^ Nanda, A.C. & Sahni, A. (1998). Ctenodactyloid rodent assemblage from Kargil Formation, Ladakh molasses group: Age and paleobiogeographic implications for the Indian subcontinent in the Oligo-Miocene. Geobios 31:533-544.
- ^ López-Antoñanzas, R. (2010). "First diatomyid rodent from the Early Miocene of Arabia" (PDF). Naturwissenschaften. 98 (2): 117–123. doi:10.1007/s00114-010-0745-0. PMID 21136247. S2CID 41698521.