There's a simple set of rules for this, universally accepted and followed by biologists:
Species names have two parts, sort of like our names, but with different spelling conventions, as follows.
- The first part, the genus, is always captalized.
- The second part, the species, is never (never ever!) capitalized.
- Format genus + species in italic font, if possible (very easy at this site, with the control-i toggle). Underline if handwritten (which a few people still do in the world).
Example: Prenolepis imparis
Note that all other taxonomic levels are capitalized, but not italicized.
Examples: Formicinae, Solenopsidini, Hymenoptera
But, these are sometimes written in an English version, which is not capitalized.
Examples: formicines, solenopsidines, hymenopterans