Kalmar "Suborder Hystricomorpha" tana nufin wani yanki na haraji na rodents wanda ya hada da naman alade, alade, chinchillas, capybaras, da sauran dabbobi masu kama. Membobin wannan tsarin suna da siffa ta haɓakar muƙamuƙin muƙamuƙi masu girma da kuma hadaddun hystricognathous, wanda ake amfani da shi don tauna da niƙa ciyayi mai tauri. Sunan "Hystricomorpha" ya fito ne daga kalmomin Helenanci "hystrix," ma'anar "porcupine," da "morphē," ma'ana "siffa" ko "siffa," kuma yana nuna gaskiyar cewa yawancin dabbobin da ke cikin wannan yanki suna raba wasu halaye na jiki tare da. kaji.