Species (used as a noun) in metaphysicsare defined by their genus (genos) and  differentia (diaphora). In other words, it belongs to a group and is distinguished from other species in that group.
Species , in metaphysics, is a specific genus-differentia defined item that is described first by its genus (genos) and then its differentia (diaphora). Put diferently, it is an item, not necessarily biological, that belongs to a group and can be distinguished from other species in that group.
R
(used as a noun) in metaphysicsare defined by their
, in metaphysics, is a specific genus-differentia defined item that is described first by its
A
then its
R
In other words, it
Put diferently, it is an item, not necessarily biological, that
R
is
can be