FIELD E ; Taxonomy Code 

 Columns 18, 19, 20, 21, 

 22, 23, 24, and 25 



PROTOCHORDATA AND VERTEBRATA 

 THROUGH PISCES 



The list of lower Chordata has presented a particular difficulty. It has been decided finally to 

 arrange a selected number of group and intergroup names, each accompanied with a note of its 

 taxonomic status relative to the superior group of which it is a member. The thread of more than one 

 taxonomic scheme can be traced through the list, therefore, by examination of the definitions of the 

 items. Regardless of the multiplicity of schemes that are represented by the many taxonomic names, 

 the basic scheme that has been followed in assigning code symbols (for fishes) is that of Berg. 

 The others are more or less "obsolete" schemes, yet they include names and organizations encountered 

 frequently enough to justify their inclusion. 



A supplemental guide to the taxonomic relationships is provided by the parenthetical numbers 

 and letters immediately preceding the name: all those items designated by the same parenthetical 

 figure represent a single classification scheme. (In general, the scheme according to Berg is marked 

 bTW- ) 



In the following list, any group name which does not represent a category assigned it in the 

 taxonomic scheme of Berg has been assigned a symbol- -as far as possible- -on the basis of that 

 group's equivalent in Berg's scheme; for example, Hyperoartia, which has been described as an order 

 of a class, Marsipobranchii, (in a scheme now probably considered "obsolete", designated as the 

 "X" series), has been assigned Code Symbol Al on the basis of the fact that its equivalent (as 

 recognized in this list) is a class, Petromyzones. 



A (1, 0, T, X 

 A (1 



A (1 



(T 



Chordata, phylum (equals phylum Vertebrata plus Hemichordata and Tunicata) 

 Protochordata (syn. Prochordata), division of phylum Chordata (equals Tunicata 



plus Leptocardii and Hemichordata) 

 Prochordata (syn. Protochordata), division of phylum Chordata (equals Tunicata 



plus Leptocardii and Hemichordata) 

 Tunicata, sub-division of division Protochordata 

 Leptocardii, sub-division of division Protochordata 

 Hemichordata, sub-division of division Protochordata 

 Enteropneusta (syn. Hemichordata) 

 Adelochorda (syn. Hemichordata) 

 Tunicata, subphylum of phylum Chordata 

 Urochordata (syn. Tunicata, subdivision or subphylum) 

 Leptocardii, subphylum of phylum Chordata (equals division Acrania) 

 Acrania (syn. Cephalochordata), (excluding Hemichordata and Tunicata) division of 



phylum Chordata 

 Cephalochordata (syn. division Acrania excluding Hemichordata and Tunicata), 



division of phylum Chordata 

 Vertebrata (syn. division Craniata), division of phylum Chordata 

 Craniata (syn. division Vertebrata), division of phylum Chordata 

 Vertebrata (syn. subphylum Craniata), subphylum of phylum Chordata 

 Craniata (syn. subphylum Vertebrata), subphylum of phylum Chordata 

 Vertebrata, phylum 



Acrania, subphylum of phylum Vertebrata 



Cephalochordata (syn. Acrania, subphylum of phylum Vertebrata) 

 Leptocardii (syn. Acrania, subphylum of phylum Vertebrata) 

 Leptocardii, class of phylum Chordata (equals Leptocardii, subphylum of phylum 



Vertebrata) 



Classification of Fishes Both Recent and Fossil; 

 1947, J. W. Edwards, Ann Arbor, Michigan. 



Leo S. Berg; 1940: English and Russian Edition, 



43 - 



