kind, sort; a class of individuals having common attributes and designated by a common name; specifically : a logical division of a genus or more comprehensive class; the human race : human beings —often used with the… See the full definition
www.merriam-webster.com
species
noun
1 a : kind, sort
en.wikipedia.org
In logic, equivocation ("calling two different things by the same name") is an informal fallacy resulting from the use of a particular word/expression in multiple senses within an argument.[1][2]
Fairly obviously, "a species of the fallacy of equivocation" is a kind of equivocation, fallaciously using the same term in different senses. I don't exactly agree with
@ashurbanipal's assessment, but it's pretty clear English for anyone with a broad vocabulary. Less well-read people might be forgiven for thinking that the word 'species' has only a biological meaning. Your question "What is a species of the fallacy of equivocation mean exactly?" also isn't very good grammar - you presumably meant what
does it mean - possibly a mistake better avoided when accusing others of 'word salads' and questioning their Englishing proficiency.