Ulemica

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Ulemica
Temporal range: Middle Permian, 265  Ma
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Ulemica092hair.jpg
Restoration of Ulemica sp.
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Therapsida
Suborder: Anomodontia
Infraorder: Venyukovioidea
Genus: Ulemica
Ivakhnenko, 1996
Type species
Venyukovia invisa
Species
  • U. invisa(Efremov, 1940)
  • U. efremoviIvakhnenko, 1996

Ulemica is an extinct genus of venyukovioid therapsids, a type of anomodont related to dicynodonts. It lived during the Middle Permian period in what is now Russia, and is known from the Isheevo assemblage of the Amanakskaya Formation. The type species, U. invisa, was originally placed in the genus Venyukovia by Russian palaeontologist Ivan Efremov in 1940. It was later given its own genus Ulemica in 1996 by Mikhaïl Ivakhnenko, who also named a second species U. efremovi. [1] Efremov had originally intended to name the fossils of U. invisa as 'Myctosuchus invisus', however, he later recognised their similarity to Venyukovia and chose to assign the Isheevo material to this genus and leaving 'Myctosuchus' a nomen nudum . [2]

Contents

Illustration of a composite Ulemica skull, combining the cranium of U. efremovi with mandibles of U. invisa. Venjukovia.jpg
Illustration of a composite Ulemica skull, combining the cranium of U. efremovi with mandibles of U. invisa.

Ulemica is known from multiple skulls and jaws from individuals of various ages, mostly of U. invisa, while U. efremovi is known only by a single skull. [3] An unusual feature of Ulemica is a pair of prominent bony bosses on each mandible, one at the bottom corner of the chin and another along the bottom edge of the jaw. These bosses are only seen in the largest and presumably oldest individuals. [4]

See also

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<span class="mw-page-title-main">Phthinosuchia</span> Extinct infraorder of mammals

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Parasumina is an extinct genus of anomodont known from the late Capitanian age at the end of the middle Permian period of European Russia. The type and only species is Parasuminia ivakhnenkoi. It was closely related to Suminia, another Russian anomodont, and was named for its resemblance. Little is known about Parasuminia as the only fossils are of fragmentary pieces of the skull and jaw, but the known remains suggest that its head and jaws were deeper and more robust than those of Suminia, and with shorter, stouter teeth. However, despite these differences they appear to have been similar animals with a similarly complex method of processing vegetation.

References

  1. Ivakhnenko, M. F. (1996). "Primitive anomodonts, venyukoviids, from the Late Permian of Eastern Europe". Paleontological Journal. 30: 575–582.
  2. Rybczynski, N. (2000). "Cranial anatomy and phylogenetic position of Suminia getmanovi, a basal anomodont (Amniota: Therapsida) from the Late Permian of Eastern Europe". Zoological Journal of the Linnean Society. 130 (3): 329–373. doi: 10.1006/zjls.1999.0218 .
  3. Barghusen, H. R. (1976). "Notes on the adductor jaw musculature of Venjukovia, a primitive anomodont therapsid from the Permian of the USSR". Annals of the South African Museum. 69 (10): 249–260. ISBN   0949940933.
  4. King, G. M. (1994). "The early anomodont Venjukovia and the evolution of the anomodont skull". Journal of Zoology. 232 (4): 651–673. doi:10.1111/j.1469-7998.1994.tb04620.x.