. Species are organisms that can breed to produce fertile offspring. Species are named by using a system called “binomial nomenclature.” Names in binomial nomenclature are “scientific names,” consisting of genus and species names written in Latin.For example, humans’ scientific name is Homo sapiens.The genus name is always initial cap, the species is always lower-case, and the entire name is written in italics to indicate it is in a foreign language—in this case, Latin. This is the smallest classifying group.or example, humans’ scientific name is Homo sapiens. The genus name is always initial cap, the species is always lower-case, and the entire name is written in italics to indicate it is in a foreign language—in this case, Latin. This is the smallest classifying group.