▁ 1 7 5 8 ▁Gray ' s ▁name ▁became ▁an ▁invalid ▁hom onym . ▁In ▁ 1 9 2 0 ▁Austin ▁Hob art ▁Clark ▁published ▁the ▁replacement ▁name ▁H eli aster ▁sol aris . ▁ ▁Ext inction ▁H eli aster ▁sol aris ▁disappeared ▁during ▁the ▁El ▁Ni ño ▁Southern ▁O sc ill ation ▁event ▁which ▁affected ▁the ▁Gal ap ag os ▁Islands ▁in ▁the ▁early ▁ 1 9 8 0 s . ▁ ▁References ▁John ▁Edward ▁Gray : ▁Mr . ▁J . ▁E . ▁Gray ' s ▁Syn opsis ▁of ▁the ▁Gener a ▁and ▁Species ▁of ▁Star fish ▁In : ▁Ann als ▁and ▁Magazine ▁of ▁Natural ▁History ▁Volume ▁ 6 , ▁ 1 8 4 0 . ▁p .   1 8 0 ▁Austin ▁Hob art ▁Clark : ▁A ▁New ▁Name ▁for ▁H eli aster ▁mult ir adi atus ▁( G ray ). ▁In : ▁Pro ceed ings ▁of ▁the ▁Bi ological ▁Society ▁of ▁Washington , ▁ 1 9 2 0 . ▁p .   1 8 3 ▁Graham ▁J . ▁Ed gar ▁et ▁al .: ▁El ▁Ni ño , ▁gra z ers ▁and ▁fish eries ▁interact ▁to ▁greatly ▁elev ate ▁ext inction ▁risk ▁for ▁Gal ap ag os ▁marine ▁species ▁In : ▁Global ▁Change ▁Bi ology ▁ 2 3 ▁October ▁ 2 0 0 9 ▁ ▁External ▁links ▁Phot ograph ▁and ▁news ▁article ▁ ▁Category : H eli aster idae ▁Category : Ext inct ▁in verte br ates ▁since ▁ 1 5 0 0 ▁Category : Anim als ▁described ▁in ▁