Topic
Haramiyida
About: Haramiyida is a research topic. Over the lifetime, 9 publications have been published within this topic receiving 479 citations.
Papers
TL;DR: The phylogeny suggests that allotherian mammals evolved from a Late Triassic Haramiyavia-like ancestor and diversified into euharamiyidans and multituberculates with a cosmopolitan distribution, implying homologous acquisition of many craniodental and postcranial features in the two groups.
Abstract: The phylogeny of Allotheria, including Multituberculata and Haramiyida, remains unsolved and has generated contentious views on the origin and earliest evolution of mammals. Here we report three new species of a new clade, Euharamiyida, based on six well-preserved fossils from the Jurassic period of China. These fossils reveal many craniodental and postcranial features of euharamiyidans and clarify several ambiguous structures that are currently the topic of debate. Our phylogenetic analyses recognize Euharamiyida as the sister group of Multituberculata, and place Allotheria within the Mammalia. The phylogeny suggests that allotherian mammals evolved from a Late Triassic (approximately 208 million years ago) Haramiyavia-like ancestor and diversified into euharamiyidans and multituberculates with a cosmopolitan distribution, implying homologous acquisition of many craniodental and postcranial features in the two groups. Our findings also favour a Late Triassic origin of mammals in Laurasia and two independent detachment events of the middle ear bones during mammalian evolution. Three new euharamiyidan species from the Jurassic period of China are described, cementing the alliance with multituberculates and showing that the initial divergence between groups of extant mammals—monotremes on the one side, marsupials and placentals on the other—goes back to the Triassic period. Haramiyids are extremely ancient fossil mammals until recently known only from teeth, and thought to be related to the extinct but extremely successful rodent-like multituberculates. The discovery of skulls and skeletons only added to the confusion, one report confirming and another questioning the alliance with multituberculates. Now Jin Meng and colleagues describe three new haramiyid species from the Jurassic period of China, cementing the alliance with multituberculates and showing that the initial divergence between groups of mammals still with us — monotremes on one side, and marsupials and placentals on the other — is very ancient, dating back to the Triassic period.
127 citations
TL;DR: The discovery of haramiyid dentaries, a maxilla and other skeletal remains in the Upper Triassic of East Greenland revealsHaramiyids as highly specialized mammals with a novel pattern of puncture-crushing occlusion that differs dramatically from the grinding or shearing mechanisms of other Early Mesozoic mammals.
Abstract: Isolated teeth referred to the family Haramiyidae are among the earliest known fossil evidence of mammals. First discovered in European Late Triassic deposits a century and a half ago1, har-amiyids have been interpreted as related to multituberculates2–7, a diverse and widespread lineage that occupied a rodent-like niche from the Late Jurassic to the Early Tertiary. Nonetheless, haramiyid relationships have remained enigmatic8,9 because the orientation and position of the teeth in the upper or lower jaw could not be determined with certainty; even their mammalian status has been questioned10. The discovery of haramiyid dentaries, a maxilla and other skeletal remains in the Upper Triassic of East Greenland reveals haramiyids as highly specialized mammals with a novel pattern of puncture-crushing occlusion that differs dramatically from the grinding or shearing mechanisms of other Early Mesozoic mammals.
105 citations
Journal Article•
TL;DR: New fossil mammal teeth are described from the Middle Jurassic (Bathonian) Forest Marble of Kirtlington, Oxfordshire, England as mentioned in this paper, which are referred to a new genus and species, Eleutherodon oxfordensis, family Eleutheherodontidae nov., suborder Eleutsaurus, order incertae sedis, assigned to Allotheria Marsh, 1880.
Abstract: New fossil mammal teeth are described from the Middle Jurassic (Bathonian) Forest Marble of Kirtlington, Oxfordshire, England. They are referred to a new genus and species, Eleutherodon oxfordensis, family Eleutherodontidae nov., suborder Eleutherodontida nov., order incertae sedis, assigned to Allotheria Marsh, 1880. These teeth are unique, but share with multituberculates and haramiyids the longitudinal arrangement of their cusps and with the former at least the propalinal action of the jaws in chewing, and palinal movement of the dentary during the power stroke. They differ in that respect from the Greenlandic Late Triassic Haramiyavia clemmenseni in which an orthal movement is predominant.
53 citations
TL;DR: The Early Cretaceous Teete vertebrate locality in Western Yakutia, East Siberia, Russia, has produced mammal remains that are attributed to three taxa: Eleutherodontidae indet.
Abstract: The Early Cretaceous (?Berriasian-Barremian) Teete vertebrate locality in Western Yakutia, East Siberia, Russia, has produced mammal remains that are attributed to three taxa: Eleutherodontidae indet. cf. Sineleutherus sp. (Haramiyida; an upper molariform tooth), Khorotherium yakutensis gen. et sp. nov. (Tegotheriidae, Docodonta; maxillary fragment with three molariform teeth and dentary fragment with one molariform tooth), and Sangarotherium aquilonium gen. et sp. nov. (Eutriconodonta incertae sedis; dentary fragment with one erupted molariform tooth and one tooth in crypt). This is the second occurrence of Mesozoic mammals in high latitudes (paleolatitude estimate N 63–70°) of the Northern Hemisphere. In spite of the presumed Early Cretaceous age based on freshwater mollusks, the Teete mammal assemblage has a distinctive Jurassic appearance, being most similar to the Middle-Late Jurassic mammal assemblages known from Siberia, Russia and Xinjiang, China. The smooth transition from Jurassic to Cretaceous biota in Northern Asia is best explained by stable environmental conditions.
31 citations
TL;DR: Detailed morphological data demonstrate that haramiyidans are more similar to multituberculates than to any other mammaliaforms, and further support the view that Arboroharamiya, as a derived haramiYidan, shows similarity to multitubculates in tooth and mandible morphologies.
Abstract: Background
Two recent studies published in the same issue of Nature reached conflicting conclusions regarding the phylogeny of early mammals: One places the clade containing haramiyidans and multituberculates within the Mammalia and the other separates haramiyidans from multituberculates and places the former outside of the Mammalia. These two contrasting results require that the minimally oldest divergence time of the Mammalia was within the Late Triassic or the Middle Jurassic, respectively. Morphological descriptions of the species named in the two papers were brief, and no comparisons between the newly named species were possible.
Principal Findings
Here we present a detailed description of the dentary bone, teeth, occlusal and wear patterns of the haramiyidan Arboroharamiya and compare it with other haramiyidans and Megaconus. Using this new information, we suggest that tooth identifications and orientations of several previously described haramiyidan species are incorrect, and that previous interpretations of haramiyidan occlusal pattern are problematic. We propose that the published upper tooth orientation of Megaconus was problematic and question the number of upper molars, the length of dentition and mandible, and presence of the mandibular middle ear in Megaconus.
Conclusions
The additional morphological descriptions and comparisons presented here further support the view that Arboroharamiya, as a derived haramiyidan, shows similarity to multituberculates in tooth and mandible morphologies. Our comparison also suggests that Megaconus lacks many diagnostic features for the family Eleutherodontidae and that its close affinity with multituberculates cannot be ruled out. The detailed morphological data demonstrate that haramiyidans are more similar to multituberculates than to any other mammaliaforms.
27 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2018 | 2 |
| 2017 | 1 |
| 2014 | 2 |
| 2013 | 1 |
| 2000 | 1 |
| 1998 | 1 |