魚の分類（12）Stensiö (1921, 1927, 1932, 1936)

ベルグが11番目に示したのがE. A. Stensiöの分類．
一連の論文，Stensiö (1921, 1927, 1932, 1936)をまとめると，以下のような分類になるとしています．

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VERTEBRATA CRANIATA

division I. AGNATHI *1

class OSTRACODERMI (= CYCLOSTOMATA)
　subclass A. PTERASPIDOMORPHI
　　order 1. † HETEROSTRACI (COELOLEPIDAE, DREPANASPIDAE, PTERASPIDAE)
　　order 2. † PALAEOSPONDYLOIDEA
　　order 3. MYXINOIDEA
　subclass B. CEPHALASPIDOMORPHI
　　order 1. † OSTEOSTRACI (CEPHALASPIDAE, TREMATASPIDAE)
　　order 2. † ANASPIDA
　　order 3. PETROMYZONTIA

division II. GNATHOSTOMATA *2

branch I. ELASMOBRANCHII
　sub-branch 1. † ACANTHODII
　sub-branch 2. † PLACODERMI
　　group A. † ANTIARCHI
　　group B. † ARTHRODIRA (order EUARTHRODIRA, order PHYLLOLEPIDA), † STEGOSELACHII, † RHENANIDA
　sub-branch 3. HOLOCEPHALI
　sub-branch 4. SELACHII
branch II. CHOANATA *3
　sub-branch 1. † CROSSOPTERYGII
　sub-branch 2. DIPNOI
branch IlI. ACTINOPTERYGII
　BRECHIOPTERYGII (POLYPTERIDAE) *4
　CHONDROSTEI, *5 HOLOSTEI, TELEOSTEI

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*1: E. Stensiö. The Downtonian and Devonian Vertebrates of Spitzbergen. Part 1. Family Cephalaspidae. Skrifter om Svalbard og Nordishavet, no. 2, Oslo, 1927, p. 379.
*2: E. Stensiö. On the Placodermi of the Upper Devonian of East Greenland. Meddel. om Grönland, vol. 97, no. 2, 1936, pp. 30-31.
*3: To the Choanata belong, besides, all the Tetrapoda.
*4: E. Stensiö. Triassic fishes from Spitzbergen. Vienna, 1921, p. 147. -- Meddel, om Grönland, vol. 88, no. 3, 1932, p. 74.
*5: On the classification of Chondrostei see E. Stensiö, Meddel. om Grönland, vol. 83, no. 3, 1932, pp. 96-97.