Posterior end of maxilla expanded dorsally, truncate or slightly concave; supramaxilla terminally positioned.
5 in HL); supramaxilla present, narrow and anteriorly positioned.
and pointed posteriorly with a concave subterminal margin dorsally, a convex subterminal margin ventrally; supramaxilla large and subterminally positioned.
8% SL; end of maxilla expanded and subterminally rounded, becoming elongate and scimitar-shaped in males, nearly reaching opercular margin; supramaxilla narrow and positioned about midmaxilla.
fossoris-galapagensis in having a rigid maxilla that is not sexually dimorphic or dichromic and in lacking a supramaxilla, it is the only Atlantic species that has the subopercle broadly expanded distally and multifid nasal cirrus in adults.