A subadult described by David Martill and Darren Naish from the University of Portsmouth in 2006 had not yet fully developed its crest, which supports the suggestion that the crest was a marker for sexual maturity.
Neodrasla jedinka koju su David Martill i Darren Naish sa sveučilišta u Portsmouthu opisali 2006. godine nije imala potpuno razvijenu krestu, što podržava mišljenje da je kresta bila znak spolne zrelosti.