Lekaneleo

Last updated

Lekaneleo
Temporal range: Late Oligocene-Early Miocene
~25–16  Ma
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Diprotodontia
Family: Thylacoleonidae
Genus: Lekaneleo
Gillespie, Archer & Hand, 2020
Type species
Lekaneleo roskellyae
Gillespie, 1997
Other species
  • L. myersiGillespie, 2023 [1]
Synonyms
  • Priscileo roskellyaeGillespie, 1997

Lekaneleo is a fossil genus of carnivorous marsupial that existed during the early Miocene in Australia. Once allied to the type species of the genus Priscileo, later placed as Wakaleo pitikantensis , "Priscileo" roskellyae was subsequently transferred to its own genus Lekaneleo. [2]

Contents

Taxonomy

The species was described by Anna Gillespie in 1997, describing material excavated at the Riversleigh World Heritage Area that included a largely complete cranium and maxillary retaining some teeth and details of the alveoli. Examination of the new species included a revision of the previously monotypic genus, Priscileo, known only by fragmented remains of teeth and a partial maxilla. The discovery of a new species of Riversleigh fauna allowed the genus to be revised (Gillespie, et al, 2017) to include the type to be recognised in the new combination as Wakaleo pitikantensis . [3] Subsequently Gillespie, Archer & Hand (2020) moved "Priscileo" roskellyae to a distinct genus Lekaneleo, arguing that it exhibits features supporting its generic distinction within Thylacoleonidae. [4] The specific epithet honours Ros Kelly, who provided support to research at Riversleigh when acting as a minister of the federal government. [2]

Description

As one of two described species of Priscileo, it is estimated to have been around two thirds the size of Priscileo pitikantensis ; [2] the body mass of L. roskellyae is calculated as 2.7 kilograms (6.0 lb). [5] The upper dental formula of this marsupial was I1–3 C1 P1–13 M 1–4. The premolar P3 is similar in form to the larger tooth in species of Wakaleo , the mid-sized thylacoleonids that also existed at Riversleigh and seemed to occupy different ecological niches in the same time period. [2]

The comparative bite force of the species, along with the larger Thylacoleo carnifex , is estimated to have been the greatest of any known mammal and strongly supports the conception of predators that killed animals larger than itself. [5] The conception of the larger species 'P. pitikantensis, based on extrapolations from the limb morphology, is proposed to have been an arboreal ambush predator. [2]

References

  1. Gillespie, A. K. (2023). "Two new marsupial lion taxa (Marsupialia, Thylacoleonidae) from the early and Middle Miocene of Australia". Alcheringa: An Australasian Journal of Palaeontology. 47 (4): 506–521. Bibcode:2023Alch...47..506G. doi:10.1080/03115518.2022.2152096. S2CID   256157821.
  2. 1 2 3 4 5 Gillespie, A. (1997). "Priscileo roskellyae sp. nov. (Thylacoleonidae, Marsupialia) from the Oligocene-Miocene of Riversleigh, northwestern Queensland". Memoirs of the Queensland Museum. 41: 321–327.
  3. Gillespie, A.K.; Archer, M.; Hand, S.J. (6 December 2017). "A new Oligo–Miocene marsupial lion from Australia and revision of the family Thylacoleonidae" . Journal of Systematic Palaeontology. 17 (1): 59–89. doi:10.1080/14772019.2017.1391885. hdl: 1959.4/unsworks_50134 . S2CID   90758394.
  4. Anna K. Gillespie; Michael Archer; Suzanne J. Hand (2020). "Lekaneleo, a new genus of marsupial lion (Marsupialia, Thylacoleonidae) from the Oligocene–Miocene of Australia, and the craniodental morphology of L. roskellyae, comb. nov". Journal of Vertebrate Paleontology. 39 (5): e1703722. doi:10.1080/02724634.2019.1703722. S2CID   214332715.
  5. 1 2 Wroe, S; McHenry, C; Thomason, J (2005). "Bite club: Comparative bite force in big biting mammals and the prediction of predatory behaviour in fossil taxa". Proceedings of the Royal Society B: Biological Sciences. 272 (1563): 619–625. doi:10.1098/rspb.2004.2986. PMC   1564077 . PMID   15817436.