Chordata

Timzikrin neɣ Tizikranin ( isem ussnan : Chordata ) d adur n iɣersiwen i d-yekkan seg ufurk asnudran n tsendisin , akken i yeṭṭafar wadur-a afel-adur n tesnimawin . Isem-is yekka-d seg yiziker n uzagur igan d angul n ugergis i d-izgan ɣef yidis n uzagur n uɣersiw. Adur-a yegber seg kuẓ n tdurin : tixefzikrin ( Cephalochordata ), timezdeɣzikin ( Vetulicolia , negrent ), timkebrin ( Tunicata ) yakk d tnaɣlalin ( Vertebrata ), dɣa snat n tegrawin-a tineggura ṭṭafarent afurk asnudran n tsekduyin ( Olfactores ).

Adur-a issiliɣ-d yiwen seg waduren meqqren yakk deg tgelda n iɣersiwen, acku tegber ugar n 65000 n telmas , ayen i d-tt-iǧǧan ad tili d tagrawt tameqrant tis snat seld n teswermin . Dɣa i snat-nsent lant (sɛant) azal n 1.5 n imelyan n telmas, neɣ ayen yegdan 80% n telmas yettwassnen.

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