Equus and others (6)
I believe the answer is:
genera
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">equus and others</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for genera that I've seen before include "Biological groupings" , "Sorts" , "Blood vessel" , "classes" , "Groups with common characteristics" .)