Loxaulax

Loxaulax is a genus of extinct mammal from the Lower Cretaceous of southern England. It was a member of the also extinct order Multituberculata, and lived alongside the dinosaurs. It lies within the suborder "Plagiaulacida" and family Eobaataridae. The genus Loxaulax was named by Simpson G.G. in 1928 based on one species.

Fossil remains of the species Loxaulax valdensis consist of a tooth found in Valanginian (Lower Cretaceous) strata of the Cliff End bonebed in Hastings, England. More recently, "Butler and Ford reported some IoW (Isle of Wight) Wealden mammal teeth several decades ago. They identified one of the teeth as belonging to the multituberculate Loxaulax but weren't sure about the others. Other IoW Wealden mammal teeth have been found since but have yet to be written up," (with thanks to Darren Naish).

Representatives from the Isle of Wight Museum say that sieving is underway at one fossil location. This suggests new mammal finds are not unlikely.

Fossil remains of the species Loxaulax herreroi were found in Barremian (Lower Cretaceous)-age strata of Galve, Spain.

Loxaulax
Temporal range: Early Cretaceous
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Multituberculata
Family: Eobaataridae
Genus: Loxaulax
Species
  • L. valdensis (type) Simpson G.G., 1928
  • L. herreroi (Crusafont Pairo & Adrover, 1966) originally ''Parendotherium herreroi''
Synonyms
  • Parendotherium

References

  • Simpson (1928), A catalogue of the Mesozoic mammalia in the geological department of the British Museum. London: British Museum (Nat Hist).
  • Kielan-Jaworowska Z & Hurum JH (2001), "Phylogeny and Systematics of multituberculate mammals". Paleontology 44, p. 389-429.

External links

Eobaataridae

Eobaataridae is a family of fossil mammal within the order Multituberculata. Remains are known from the Lower Cretaceous of Europe and Asia. These herbivores thus lived during the Mesozoic era, also known as the "age of the dinosaurs". They were among the most derived representatives of the informal suborder "Plagiaulacida".

In this case of one taxon, remains are reasonably well known. This refers to Sinobaatar from the extraordinary Chinese locality of Liaoning. They were close relatives of the Plagiaulacidae, while the second upper molar has similarities to ones known from the informal Paracimexomys group within the more derived suborder, Cimolodonta.

The recently described Indobaatar from the Early Jurassic Kota Formation is the earliest known multituberculate, let alone the earliest eobaatarid, and may stretch the eobaatarid-cimolodontan group much earlier than previously thought.Genus Teutonodon is the first Jurassic mammal discovered in Germany.

List of multituberculate species

This is a taxonomic list of species in the extinct mammalian order Multituberculata.

Multituberculata

Multituberculata (commonly known as multituberculates, named for the multiple tubercles of their teeth) is an extinct taxon of rodent-like allotherian mammals that existed for approximately 166 million years, the longest fossil history of any mammal lineage. They eventually declined from the late Palaeocene onwards, disappearing in the late Eocene, though they might have lived even longer into the Miocene, if gondwanatheres are part of this group. More than 200 species are known, ranging from mouse-sized to beaver-sized. These species occupied a diversity of ecological niches, ranging from burrow-dwelling to squirrel-like arborealism to jerboa-like hoppers. Multituberculates are usually placed as crown mammals outside either of the two main groups of living mammals—Theria, including placentals and marsupials, and Monotremata—but closer to Theria than to monotremes.

Plagiaulacida

Plagiaulacida is a group of extinct multituberculate mammals. Multituberculates were among the most common mammals of the Mesozoic, "the age of the dinosaurs". Plagiaulacids, an informal suborder, are the most basal of this order, and ranged from the Middle Jurassic Period to the Lower Cretaceous Period of the northern hemisphere.

Kielan-Jaworowska and Hurum (2001) divides “Plagiaulacida” into three informal lineages, the paulchoffatiids, the plagiaulicids, and the allodontids.

Wessex Formation

The Wessex Formation is a fossil-rich English geological formation that dates from the Berriasian to Barremian stages (about 145–125 million years ago) of the Early Cretaceous. It forms part of the Wealden Group and underlies the younger Vectis Formation and overlies the Durlston Formation. The dominant lithology of this unit is mudstone with some interbedded sandstones.

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