Question: Information: - Borophagina is a hypocarnivorous subtribe of Borophaginae, a group of terrestrial canines which inhabited most of North America during the Hemingfordian stage of the Early Miocene subepoch to the Zanclean stage of the Pliocene epoch 20.63.6 Mya existing approximately . - Protomarctus is an extinct member of the Borophaginae and a small terrestrial canine ( bear - dog ) which inhabited most of North America during the Burdigalian stage of the Miocene epoch 20.4 -- 15.9 Mya , existing for approximately 4.5 million years . - In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end subfamily botanical names with "-oideae", and zoological names with "-inae". - Invertebrates are animals that neither possess nor develop a vertebral column (commonly known as a "backbone" or "spine"), derived from the notochord. This includes all animals apart from the subphylum Vertebrata. Familiar examples of invertebrates include insects; crabs, lobsters and their kin; snails, clams, octopuses and their kin; starfish, sea-urchins and their kin; and worms. - The subfamily Borophaginae is an extinct group of canids called "bone-crushing dogs" that were endemic to North America during the Oligocene to Pliocene and lived roughly 362.5 million years ago and existing for about . - The Burdigalian is, in the geologic timescale, an age or stage in the early Miocene. It spans the time between 20.43 0.05 Ma and 15.97 0.05 Ma (million years ago). Preceded by the Aquitanian, the Burdigalian was the first and longest warming period of the Miocene and is succeeded by the Langhian. - The Langhian is, in the ICS geologic timescale, an age or stage in the middle Miocene epoch/series. It spans the time between 15.97 0.05 Ma and 13.65 0.05 Ma (million years ago) during the Middle Miocene. - The Miocene is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Sir Charles Lyell. Its name comes from the Greek words (', less) and (', new) and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene Epoch and is followed by the Pliocene Epoch. What is the relationship between 'protomarctus' and 'genus'?
Answer:
taxon rank