There are two extant species of Hydrochoerus: Hydrochoerus isthmius, the lesser or Panamanian capybara, and the genotype species H. hydrochaeris. The latter is the more common species of capybara, found throughout most of South America, whereas the other is restricted to the northwestern side of the Andes ranging into Panama. However, H. hydrochaeris doesn't seem to have a useful common name to distinguish it from H. isthmius. It's referred to as the "capybara", but both species are capybaras, and it's never referred to as the "common capybara", "greater capybara", or "southern capybara". H. hydrochaeris is also much larger than H. isthmius (nearly twice the size of the latter species).

I am making a figure I intend to use to show to an educated layman audience, and am using capybara bones as an extant scale. I am trying to use the common name to not confuse my audience, but at the same time I want to make it clear I am referring to H. hydrochaeris and not H. isthmius so there is no confusion for people who are more familiar with scientific names. Given this, what would be the correct common name to refer to H. hydrochaeris such that I do not confuse my audience?

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