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Euharamiyida

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Fossil specimen of Maiopatagium furculiferum displayed at the National Natural History Museum of China.

Euharamiyida

Euharamiyida, also called Eleutherodontida, were early mammals or mammal-like animals. They lived from the Middle Jurassic to the Early Cretaceous periods. We find them in Eurasia and maybe North America.

Scientists sometimes think this group is close to another group called Multituberculata. Or, they might have come from the synapsid line earlier.

There is talk about if Euharamiyida are related to haramiyids from the Late Triassic, like Haramiyavia. By looking at their teeth, we know these animals probably ate plants or a mix of plants and small animals. Some might have lived in trees and could glide through the air, like flying squirrels today.

Evolution

Life restoration of Shenshou, an extinct squirrel-like euharamiyidan from the Middle Jurassic of China

Scientists are still learning where euharamiyidans fit among early mammals. Some think they were a special kind of mammal called multituberculates. Others believe they were very early relatives of mammals. This depends on how they connect to older creatures from the Triassic period, like Haramiyavia and Thomasia. Some studies show these groups may not be related at all.

Phylogeny

Euharamiyida, also called Eleutherodontida, is a group of early mammals or mammal-like creatures. They lived from the Middle Jurassic to the Early Cretaceous periods. They were found in Eurasia and maybe North America. Scientists sometimes think this group is related to another group called Multituberculata. There is also debate about whether they are connected to haramiyids from the Late Triassic, such as Haramiyavia.

Taxa

Here are the main groups of animals in Euharamiyida, based on a study from 2022:

Images

Scientific illustration of Abdalodon diastematicus, an ancient mammal-like reptile, showing its appearance in prehistoric times.
A scientific artist's reconstruction of Galesaurus planiceps, an ancient mammal-like reptile from the Triassic period.
Illustration of Chiniquodon theotonicus, an ancient mammal-like reptile from the Triassic period.
Artist's reconstruction of Riograndia guaibensis, an ancient cynodont animal from the fossil record.
Pencil drawing of Oligokyphus triserialis, an ancient mammal-like reptile from the Early Jurassic period.
Illustration of Morganucodon oehleri, an early mammal from the age of dinosaurs.
An artist's illustration of Docofossor, an ancient mammal-like reptile from China, showing its unique body and digging posture.

Related articles

Multituberculata
Gondwanatheria

This article is a child-friendly adaptation of the Wikipedia article on Euharamiyida, available under CC BY-SA 4.0.

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