| Mae Long Formation | |
|---|---|
| Stratigraphic range: Early Miocene (MN 4) ~ | |
| Type | Geological formation |
| Lithology | |
| Primary | Sandstone |
| Location | |
| Region | Lamphun Province |
| Country |  Thailand |
| Extent | Li Basin |
The Mae Long Formation in the Li Basin (also referred to as Li Mae Long) is a fossil site in Lamphun Province, Thailand. The fossils found are thought to date to the late Early Miocene, about 18 million years ago, corresponding to the European zone MN 4. [1]
Mammals found at the site include: [1]
Ailuridae is a family in the mammal order Carnivora. The family consists of the red panda and its extinct relatives.
Tamias is a subgenus of chipmunks within the synonymous genus Tamias in the tribe Marmotini of the squirrel family. The subgenus includes a single living species, the eastern chipmunk. The genus name Tamias means "treasurer", "steward", or "housekeeper", which is a reference to the animals' role in plant dispersal through their habit of collecting and storing food for winter use.
Eutamias is a genus of chipmunks within the tribe Marmotini of the squirrel family. It includes a single living species, the Siberian chipmunk. The genus is often treated as a subgenus of Tamias, which is now restricted to the eastern chipmunk of North America. Neotamias, which now includes the western North American chipmunks, has also been included in Eutamias.
Tyto is a genus of birds consisting of true barn owls, grass owls and masked owls that collectively make up all the species within the subfamily Tytoninae of the barn owl family, Tytonidae.
Diatomyidae is a family of hystricomorph rodents. It is represented by a single living species, Laonastes aenigmamus, native to Laos in Southeast Asia. Fossil species are known from the Oligocene and Miocene of Asia and eastern Europe.
Diatomys is an extinct rodent genus known from Miocene deposits in China, Japan, Pakistan, and Thailand. The fossil range is from the late Early Miocene to the Middle Miocene.
Neotetracus is a genus of gymnure that contains a single extant species, the shrew gymnure (Neotetracus sinensis) of China and Southeast Asia.
Ia is a genus of bat in the family Vespertilionidae. It belongs to the subfamily Vespertilioninae and has been placed in the tribe Vespertilionini. In the past, it has also been considered a synonym or subgenus of the genera Pipistrellus or Eptesicus, which used to contain many more species than they do now. Ia comprises a single living species, the great evening bat (I. io) of eastern and southeastern Asia, and one extinct fossil species, I. lanna, from the Miocene epoch in Thailand. Another living species, I. longimana, was recognized in the past, but it is no longer considered a valid species distinct from the great evening bat.
Sansanosmilus is an extinct genus of carnivorous mammal of the family Barbourofelidae endemic to Europe, which lived during the Miocene, 13.6—11.1 mya, existing for approximately 2.5 million years.
Euthecodon is an extinct genus of long-snouted crocodylid crocodilians. It was common throughout much of Africa during the Neogene, with fossils being especially common in Kenya. Although superficially resembling that of gharials, the long snout was a trait developed independently from that of other crocodilians and suggests a diet of primarily fish. Euthecodon coexisted with a wide range of other crocodiles in the areas it inhabited before eventually going extinct during the Pleistocene.
Miniopterus zapfei is a fossil bat in the genus Miniopterus from the middle Miocene of France. First described in 2002, it is known only from the site of La Grive M, where it occurs with another fossil Miniopterus species, the smaller and more common Miniopterus fossilis. M. zapfei is known from five mandibles and an isolated fourth upper premolar (P4). The fourth lower premolar is more slender than in M. fossilis and the cingulum shelf surrounding the P4 is less well-developed than in living Miniopterus. The length of the first lower molar is 1.57 to 1.60 mm.
Lagrivea is a fossil genus of squirrel from the Middle Miocene of France. The single species, L. vireti, is known from three mandibles and two isolated teeth. All come from the fissure filling of La Grive L5, part of the La Grive-Saint-Alban complex in Saint-Alban-de-Roche, southeastern France. Lagrivea was a large tree squirrel with flat lower incisors and a large, triangular fourth lower premolar (p4). Each of the four cheekteeth bears a deep basin in the middle of the crown. The m3 is about rectangular in shape, but rounded at the back. Although m1 and m2 have two roots, m3 has three.
Ekgmowechashala is an extinct genus of primate belonging to Adapiformes.
? Nycticebus linglom is a fossil strepsirrhine primate from the Miocene of Thailand. Known only from a single tooth, an upper third molar, it is thought to be related to the living slow lorises, but the material is not sufficient to assign the species to Nycticebus with certainty, and the species name therefore uses open nomenclature. With a width of 1.82 mm, this tooth is very small for a primate. It is triangular in shape, supported by a single root, and shows three main cusps, in addition to various crests. The absence of a fourth cusp, the hypocone, distinguishes it from various other prosimian primates.
Tupaia miocenica is a fossil treeshrew from the Miocene of Thailand. Known only from a single tooth, an upper first or second molar, it is among the few known fossil treeshrews. With a length of 3.57 mm, the tooth is large for a treeshrew. At the back lingual corner, the tooth shows a small cusp, the hypocone, that is separated from the protocone in front of it by a narrow valley. The condition of the hypocone distinguishes this species from various other treeshrews. In addition, the presence of a well-developed but simple mesostyle is distinctive.
Prolagus oeningensis is an extinct lagomorph and the type species of its genus, Prolagus. It lived from 15.97 to 7.75 Ma, existing for about 8 million years.
Siamoperadectes is a genus of non-marsupial metatherian from the Miocene of Thailand. A member of Peradectidae, it is the first member of its clade known from South Asia, and among the last non-marsupial metatherians.
Pliopithecoidea is an extinct superfamily of catarrhine primates that inhabited Asia and Europe during the Miocene. Although they were once a widespread and diverse group of primates, the pliopithecoids have no living descendants.
Hipposideros felix is a species of bat known from Miocene fossil deposits at Li Mae Long in Thailand. The holotype is a tooth, the third molar, of a hipposiderid bat with affinities to the Brachipposideros group of fossil species found in Australia and France. The first description was published in a study of mammal specimens at the fossil site that produced evidence of unknown species, including other bats. The species is only known from the Li Mae Long, a site that was determined to be a forest near an open body of water in the Miocene. The authors, Léonard Ginsburg and Pierre Mein, proposed the specific epithet felix, derived from Latin, as a reference to the regions cultural perception of a bat as a symbol of happiness and good fortune.
Anhinga pannonica is an extinct species of darter from the Miocene of Europe and Africa. Described in 1916, A. pannonica is the only species of darter to have existed in Europe and is notably larger than most extant species, with an estimated weight of 3.3 kg (7.3 lb). The species likely went extinct as the climate continued to cool towards the end of the Miocene and beginning Pliocene, heavily effecting the darter that would have required a subtropical or tropical climate to survive.