▁are ▁adapted ▁for ▁the ▁su ctor ial ▁feed ing ▁hab its ▁of ▁the ▁group . ▁ ▁Kat he ▁R . ▁J ensen ▁( 2 0 0 7 ) ▁recognized ▁ 2 8 4 ▁valid ▁species ▁within ▁the ▁Sac og loss a . ▁ ▁App earance ▁▁ ▁Many ▁of ▁these ▁g ast rop ods ▁( e . g . ▁E ly s ia ▁s pp .) ▁res emble ▁wing ed ▁sl ugs ▁with ▁a ▁pair ▁of ▁ce phal ic ▁tent acles . ▁ ▁In ▁photos yn th etic ▁members ▁of ▁the ▁group , ▁the ▁wings , ▁or ▁par ap odia , ▁can ▁be ▁un fur led ▁to ▁maxim ise ▁the ▁area ▁of ▁the ▁organ ism ▁that ▁is ▁struck ▁by ▁sun light . ▁ ▁In ▁others ▁( e . g . ▁P lac ida ▁s pp .) ▁cyl ind rical ▁cer ata ▁extend ▁from ▁the ▁d ors al ▁surface . ▁The ▁majority ▁of ▁s acc og loss ans ▁are ▁between ▁one ▁and ▁three ▁cent imet res ▁in ▁length ; ▁they ▁are ▁typically ▁uniform ▁in ▁color ▁because ▁of ▁the ▁ch lor op last s ▁they ▁ing est ▁which ▁end ▁up ▁installed ▁in ▁their ▁own ▁cells . ▁ ▁Distribution ▁▁ ▁Sac og loss a ▁are ▁found ▁world wide ▁in ▁tropical ▁and ▁temper ate ▁o ce ans , ▁but ▁most ▁species ▁live ▁in ▁the ▁central ▁Pacific ▁Ocean , ▁where ▁they ▁frequent ▁the ▁sh or elines ▁of ▁tropical ▁islands ; ▁diverse ▁tract s ▁of ▁species ▁are ▁also ▁known ▁in ▁the ▁Car ib bean ▁and ▁Ind o - P ac