Name The Rules On How To Write A Scientific Name . Italicise or underline (because it's in latin) 2. The basic rule of how scientific names are written. How to Write a Scientific Name 8 Steps (with Pictures) wikiHow from www.wikihow.com The basic rule for writing a scientific name. In titles, it is appropriate to write the entire scientific name of animals in uppercase letters. If it is handwritten, it is written in cursive or underlined.