basis of record
Margulis, L.; Schwartz, K.V. (1998). Five Kingdoms: an illustrated guide to the Phyla of life on earth. 3rd edition. Freeman: New York, NY (USA). ISBN 0-7167-3027-8. xx, 520 pp. (look up in IMIS) [details]
Margulis, L.; Schwartz, K.V. (1982). Five Kingdoms : an illustrated guide to the phyla of life on earth. Second edition. Freeman. (look up in IMIS) [details]
From editor or global species database
Taxonomy Fish are a now paraphyletic group. So Pisces will no longer be part of the formal classification.
Although variable with time, fishes contain also lampreys and hagfishes (Cyclostomata revived). Such groups as Agnatha and Cephalaspidomorphi are paraphyletic now as originally defined, because of new insights on some fossils.
Pisces = Vertebrata (= Craniata now) - Tetrapoda. [details]
From other sources
Validity informal group [details]