Final answer:
Acerodon celebensis and Acerodon humilis share the Genus classification. They are both part of the genus 'Acerodon,' yet they are distinct species within this taxonomic grouping.
Step-by-step explanation:
Acerodon celebensis and Acerodon humilis are different species of fruit bats. The smallest classification that these bats have in common would be Genus. The scientific classification includes several levels, and since these two species share the same genus name, 'Acerodon,' they are most closely related at the genus level. If they were in the same species, they would share both a genus and species name.
In the context of taxonomy, the hierarchy of classifications from broadest to most specific is: domain, kingdom, phylum, class, order, family, genus, and species. Within the class Mammalia, which encompasses all mammals including humans and bats, the species are further divided into orders, into families, then genera, and finally individual species.
As another example, both cats and dogs are part of the same order called Carnivora, but they only start sharing the same taxonomic group at the order level, not genus or species.