English
heterospecies
From hetero- + species.
Proto-Indo-European *sem- ‘one, whole’
Proto-Indo-European *sḿ̥teros
Proto-Hellenic *hə́teros
Ancient Greek ἕτερος ‘other, another, different’
English hetero-
Proto-Indo-European *speḱ- ‘to see’
Proto-Indo-European *spéḱyeti ‘to be looking at’
Proto-Italic *spekjō ‘to observe’
Latin speciō ‘see’
Latin speciēs ‘appearance’
English species
Today it means
adj Related to two separate species (in any sense)
Language periods are conventional ranges, not dates for this word.
Etymograph / heterospecies