▁n emat oc yst s , ▁producing ▁the ▁I ru k and ji ▁synd rome . ▁Even ▁though ▁positions ▁of ▁sp ines ▁on ▁the ▁sh aft ▁of ▁the ▁Car uki idae ▁cause ▁ill ness , ▁there ▁are ▁areas ▁on ▁the ▁body ▁that ▁do ▁not . ▁The ▁rh op al ial ▁n iche ▁open ings , ▁which ▁disc ern ▁light , ▁do ▁not ▁in cur ▁any ▁ill ness . ▁The ▁Car uki idae ▁also ▁have ▁non - ven om ous ▁rh op ali ar ▁horn s , ▁which ▁are ▁imper cept ive ▁in ▁function ▁and ▁located ▁above ▁the ▁rh op al ial ▁nich es . ▁ ▁I ru k and ji ▁synd rome ▁triggered ▁by ▁Car uki idae ▁requires ▁immediate ▁medical ▁attention . ▁In ▁the ▁event ▁that ▁it ▁goes ▁un tre ated ▁in ▁humans , ▁card iac ▁arrest ▁is ▁a ▁potentially ▁dead ly ▁consequence . ▁ ▁Classification ▁ ▁Car uk ia ▁ ▁Car uk ia ▁bar nes i ▁( S outh c ott , ▁ 1 9 6 7 ) ▁ ▁Car uk ia ▁sh in ju ▁( G ers h win , ▁ 2 0 0 5 ) ▁ ▁Ger ong ia ▁ ▁Ger ong ia ▁rif k inae ▁( G ers h win ▁& ▁Ald ers lade , ▁ 2 0 0 5 ) ▁ ▁Mal o ▁ ▁Mal o ▁king i ▁( G ers h win , ▁ 2 0 0 7 ) ▁ ▁Mal o ▁maxim us ▁( G ers h win , ▁ 2 0 0 5 ) ▁