d well ing ▁c ray fish ▁of ▁the ▁genus ▁Ast ac opsis ▁were ▁collect ively ▁known ▁as ▁Ast ac opsis ▁fran k lin ii ▁in ▁honour ▁of ▁the ▁polar ▁expl orer ▁and ▁Governor ▁of ▁Van ▁D iem en ' s ▁Land ▁Sir ▁John ▁Franklin . ▁ ▁Ast ac opsis ▁fran k lin ii ▁now ▁refers ▁only ▁to ▁the ▁smaller ▁southern ▁species , ▁while ▁the ▁medium ▁s ized ▁western ▁species ▁is ▁known ▁as ▁Ast ac opsis ▁tr ic orn is ▁and ▁Ast ac op is ▁g ould i ▁refers ▁exclus ively ▁to ▁the ▁giant ▁northern ▁c ray fish . ▁It ▁is ▁a ▁common ▁mis con ception ▁that ▁A . ▁g ould i ▁is ▁named ▁after ▁the ▁conv ict ▁artist ▁William ▁B uel ow ▁G ould . ▁W B ▁G ould ' s ▁" Sk etch book ▁of ▁fish es " ▁produced ▁at ▁the ▁Mac qu arie ▁Har bour ▁pen al ▁settlement ▁contains ▁an ▁image ▁of ▁the ▁large ▁western ▁Tas man ian ▁fresh water ▁c ray fish ▁A . ▁tr ic orn is ▁not ▁A . ▁g ould i . ▁ ▁Bi ology ▁and ▁e col ogy ▁A . ▁g ould i ▁are ▁om n iv orous ▁cr ust ace an , ▁primarily ▁e ating ▁decay ing ▁wood , ▁leaves ▁and ▁their ▁associated ▁micro bes . ▁They ▁may ▁also ▁eat ▁small ▁fish , ▁insect s , ▁ro tt ing ▁animal ▁flesh ▁and ▁other ▁det rit us ▁when ▁available . ▁Col our ▁var ies ▁consider ably ▁among ▁individuals , ▁with ▁adult s ▁r anging ▁from ▁dark