Panthera spelaea, also known as the Eurasian cave lion, European cave lion or steppe lion, is an extinct Panthera species that most likely evolved in Europe after the third Cromerian interglacial stage, less than 600,000 years ago. Phylogenetic analysis of fossil bone samples revealed that it was highly distinct and genetically isolated from the modern lion (Panthera leo) occurring in Africa and Asia.
Analysis of morphological differences and mitochondrial data support the taxonomic recognition of Panthera spelaea as a distinct species that genetically diverged from the lion about . Nuclear genomic evidence shows a more recent split approximately 500,000 years ago, with no subsequent interbreeding with the ancestors of the modern lion. It became extinct about 13,000 years ago.
Felis spelaea was the scientific name used by Georg August Goldfuss in 1810 for a fossil lion skull that was excavated in a cave in southern Germany. It possibly dates to the Würm glaciation.
Several authors regarded Panthera spelaea as a subspecies of the modern lion, and therefore as Panthera leo spelaea.
One author considered the cave lion to be more closely related to the tiger based on a comparison of skull shapes, and proposed the scientific name Panthera tigris spelaea.
Results from morphological studies showed that it is distinct in cranial and dental anatomy to justify the specific status of Panthera spelaea. Results of phylogenetic studies also support this assessment.
In 2001, the subspecies Panthera spelaea vereshchagini was proposed for seven specimens found in Siberia and Yukon, which have smaller skulls and teeth than the average P. spelaea. Before 2020, genetic analysis using ancient DNA provided no evidence for their distinct subspecific status; DNA signatures from P. spelaea from Europe and Alaska were indistinguishable, suggesting one large panmictic population. However, analysis of mitochondrial genome sequences from 31 cave lions showed that they fall into two monophyletic clades.
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