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* phylum chordata** subphylum tunicata (urochordata) – (tunicates; 3,000 species)*** class ascidiacea (sea squirts)*** class thaliacea (salps)*** class appendicularia (larvaceans)*** class sorberacea** subphylum cephalochordata (acraniata) – (lancelets; 30 species)*** class leptocardii (lancelets)** subphylum vertebrata (craniata) (vertebrates – animals with backbones; 57,674 species)*** infraphylum incertae sedis**** superclass 'agnatha' paraphyletic (jawless vertebrates; 100+ species)***** class myxini (hagfish; 65 species)***** class petromyzontida or hyperoartia (lampreys)***** class †conodonta***** class †pteraspidomorphi***** class †thelodonti***** class †anaspida***** class †cephalaspidomorphi*** infraphylum gnathostomata (jawed vertebrates)**** superclass incertae sedis***** class †placodermi (paleozoic armoured forms)***** class chondrichthyes (cartilaginous fish; 900+ species)***** class †acanthodii (paleozoic "spiny sharks")**** superclass osteichthyes (bony fish; 30,000+ species)***** class actinopterygii (ray-finned fish; about 30,000 species)***** class sarcopterygii (lobe-finned fish: 8 species)**** superclass tetrapoda (four-limbed vertebrates; 28,000+ species)(the classification below follows benton 2004, and uses a synthesis of rank-based linnaean taxonomy and also reflects evolutionary relationships.
== sistematică ===== sistematică după ... ===* Încrengătura chordata** subîncrengătura tunicata (urochordata)*** clasa ascidiacea*** clasa thaliacea*** clasa appendicularia** subîncrengătura cephalochordata (acraniata)** subîncrengătura vertebrata (craniata )*** clasa agnatha**** infraîncrengătură gnathostomata**** clasa chondrichthyes**** clasa acanthodii**** clasa osteichthyes**** supraclasă tetrapoda***** clasa amphibia***** clasa reptilia***** clasa aves****** clasa mammalia=== clasificarea cordatelor după georgescu 1997 ===== bibliografie ==georgescu, d., "animale nevertebrate" – morfofizioloige – editura didactică și pedagogică, r.a. bucurești, 1997.