Consider three living beings:
Human — an animal with the distinctive nature of a human.
Horse — an animal of a different species.
Sheep — an animal of another species.
These beings have different specific essences: human cannot simply mean horse or sheep. Yet animal is shared by all three as a constituent of their classification by nature.
A genus is therefore not merely a convenient shared label. It signifies something common within the essences of different species.
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The Five Predicables: Genus, Species and Hierarchy of Genera
Consider three living beings:
Human — an animal with the distinctive nature of a human.
Horse — an animal of a different species.
Sheep — an animal of another species.
These beings have different specific essences: human cannot simply mean horse or sheep. Yet animal is shared by all three as a constituent of their classification by nature.
A genus is therefore not merely a convenient shared label. It signifies something common within the essences of different species.