Groebertherium

Groebertherium; Temporal range: Late Santonian-Maastrichtian; ~84–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Clade:	Cladotheria
Superorder:	†Dryolestoidea
Order:	†Dryolestida
Genus:	†Groebertherium; Bonaparte, 1986
Species
	†G. allenensis Rougier et al., 2009; †G. stipanicici Bonaparte, 1986 (Type);
Synonyms
	Alamitherium Bonaparte, 2002; Barberenia Bonaparte, 1990; Brandonia Bonaparte, 1990;

Groebertherium is a genus of dryolestoid mammal from the Late Cretaceous Los Alamitos and Allen Formations of Argentina. It is not closely related to other contemporary dryolestoids, all of which are part of the clade Meridiolestida.^[2]^[3]

Classification

Groebertherium has been consistently recovered as a dryolestoid within Dryolestida and outside of Meridiolestida, though its exact positioning varies among several studies. Rougier et al. 2011, for example, recovers it as a member of Dryolestidae, rendering it a relictual survivor of this clade with a gap of 40 million years in relation to the youngest northern dryolestids,^[3] while Harper et al. 2018 recovers it as slightly closer to Meridiolestida than to northern dryolestoids.^[2]

Palaeobiology

Unlike meridiolestidans, it retains a parastylar hook on its molariform teeth. Therefore, it was likely less specialised to transverse (side-to-side) mastication.^[2]^[3] It was rather similar to Dryolestes, indicating a similar tenrec or hedgehog-like lifestyle.^[3]

References

^ Rougier, G. W.; Martinelli, A. G.; Forasiepi, A. M. (2021). "Dryolestoids". Mesozoic Mammals from South America and Their Forerunners: 201–260. doi:10.1007/978-3-030-63862-7_6.
^ ^a ^b ^c Harper, Tony; Parras, Ana; Rougier, Guillermo W. (2018). "Reigitherium (Meridiolestida, Mesungulatoidea) an Enigmatic Late Cretaceous Mammal from Patagonia, Argentina: Morphology, Affinities, and Dental Evolution". Journal of Mammalian Evolution. 26 (4): 447–478. doi:10.1007/s10914-018-9437-x. hdl:11336/81478.
^ ^a ^b ^c ^d Rougier, Guillermo W.; Apesteguía, Sebastián; Gaetano, Leandro C. (2011). "Highly specialized mammalian skulls from the Late Cretaceous of South America". Nature. 479 (7371): 98–102. Bibcode:2011Natur.479...98R. doi:10.1038/nature10591. PMID 22051679.

[Rougier2021-1] Rougier, G. W.; Martinelli, A. G.; Forasiepi, A. M. (2021). "Dryolestoids". Mesozoic Mammals from South America and Their Forerunners: 201–260. doi:10.1007/978-3-030-63862-7_6.

[Harper_et_al_2018-2] Harper, Tony; Parras, Ana; Rougier, Guillermo W. (2018). "Reigitherium (Meridiolestida, Mesungulatoidea) an Enigmatic Late Cretaceous Mammal from Patagonia, Argentina: Morphology, Affinities, and Dental Evolution". Journal of Mammalian Evolution. 26 (4): 447–478. doi:10.1007/s10914-018-9437-x. hdl:11336/81478.

[Rougier_et_al_2011-3] Rougier, Guillermo W.; Apesteguía, Sebastián; Gaetano, Leandro C. (2011). "Highly specialized mammalian skulls from the Late Cretaceous of South America". Nature. 479 (7371): 98–102. Bibcode:2011Natur.479...98R. doi:10.1038/nature10591. PMID 22051679.

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