humans. The particular human Plato is named in the diagram. Plato is not a species (that is why his name is not in bold, unlike the species above). So, human is the lowest species in this diagram. The technical name for the lowest species in such a scheme is the infima species. So, for this diagram, human is the infima species. See also Hegelian Dialectic Hierarchy Ontology Sefer ha-Ikkarim Level of analysis Tree of life Notes References Further reading Sources Porphyry, Isagoge (Porphyry's Introduction to Aristotle's 'Categories'''.) Porphyry's Introduction, translation and commentary by Jonathan Barnes, Oxford, Oxford University Press, 2003. Studies Asztalos, Monika. (1993). "Boethius as a Transmitter of Greek Logic to the Latin West: The Categories". Harvard Studies in Classical Philology, 95 (1993), pp. 367–407. Blum, Paul Richard. (1999). Dio e gli individui: L' Arbor Porphyriana nei secoli XVII e XVIII. Rivista di filosofia neo-scolastica 91: 18-49. Franklin, James. (1986). "Aristotle on Species Variation". Philosophy, 61:236 (April 1986), pp. 245–252. Kretzmann, Norman. (1966). William of Sherwood's Introduction to Logic (Minneapolis: University of Minnesota Press, 1966). Martin, John N. (2001). "Proclus and the Neoplatonic Syllogistic". Journal of Philosophical Logic, 30:3 (June 2001), pp. 187–240. Peter of Spain. (1947). Summulae Logicales'', I. M. Bocheński (ed.) (Turin: Marietti, 1947). External links Aristotelianism Neoplatonism Concepts in logic Conceptual models Term logic Ontology