▁and ▁C . ▁ang el ensis , ▁whereas ▁the ▁El ▁M uerto ▁Island ▁spe ck led ▁r att les nake ▁was ▁considered ▁part ▁of ▁C . ▁p yr r hus ▁ ▁Conserv ation ▁status ▁The ▁nomin ate ▁sub species ▁( C . ▁m . ▁mit ch elli i ▁) ▁is ▁class ified ▁as ▁" Le ast ▁Conc ern " ▁on ▁the ▁IU CN ▁Red ▁List ▁of ▁Th re aten ed ▁Species . ▁The ▁population ▁tr end ▁was ▁stable ▁when ▁ass essed ▁in ▁ 2 0 0 7 . ▁Species ▁are ▁listed ▁as ▁such ▁due ▁to ▁their ▁wide ▁distribution , ▁pres umed ▁large ▁population , ▁or ▁because ▁they ▁are ▁unlikely ▁to ▁be ▁decl ining ▁fast ▁enough ▁to ▁qual ify ▁for ▁listing ▁in ▁a ▁more ▁threatened ▁category . ▁ ▁References ▁ ▁Further ▁reading ▁C ope ▁ED ▁( 1 8 6 1 ). ▁" Cont ribution s ▁to ▁the ▁O phi ology ▁of ▁Lower ▁California , ▁Mexico ▁and ▁Central ▁America ". ▁Pro ceed ings ▁of ▁the ▁ ▁Academy ▁of ▁Natural ▁Sciences ▁of ▁Philadelphia ▁ 1 3 : ▁ 2 9 2 - 3 0 6 . ▁( C aud ison a ▁mit ch elli i , ▁new ▁species , ▁pp .   2 9 3 – 2 9 4 ). ▁ ▁External ▁links ▁ ▁C rot alus ▁ang el ensis ▁at ▁San ▁Diego ▁Natural ▁History ▁Museum ▁C rot alus ▁mit ch elli ▁at ▁San ▁Diego ▁Natural ▁History ▁Museum ▁C rot alus ▁mit ch elli i ▁p yr r hus ▁ ▁mit ch elli i ▁Category :