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Plagiostomi
Taxonomy
Plagiostomi was named by Cuvier.
It was reranked as the order Plagiostomi by Owen (1859), Leidy (1873) and Gadow (1898); it was reranked as the subclass Plagiostomata by Hay (1902); it was reranked as the class Plagiostomi by Gunnell (1933); it was reranked as the subclass Plagiostomi by Rapp (1946).
It was assigned to Elasmobranchii by Gadow (1898); to Elasmobranchii by Leidy (1873) and Hay (1902); to Vertebrata by Owen (1859) and Gunnell (1933); and to Chrondroterygia by Rapp (1946).
It was reranked as the order Plagiostomi by Owen (1859), Leidy (1873) and Gadow (1898); it was reranked as the subclass Plagiostomata by Hay (1902); it was reranked as the class Plagiostomi by Gunnell (1933); it was reranked as the subclass Plagiostomi by Rapp (1946).
It was assigned to Elasmobranchii by Gadow (1898); to Elasmobranchii by Leidy (1873) and Hay (1902); to Vertebrata by Owen (1859) and Gunnell (1933); and to Chrondroterygia by Rapp (1946).
Subtaxa
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Or. †Plagiostomi Cuvier
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G. †Narcopterus Agassiz 1835
Invalid names: Eulamiidae [empty], Hexeptranchidae [empty], Raiae [empty]
Diagnosis
Reference | Diagnosis | |
---|---|---|
R. Owen 1859 | Endo-skeleton cartilaginous or partially ossified; exo-skeleton placoid; gills fixed with five or more gill-apertures; no swim-bladder; scapular arch detached from the head; ventrals abdominal; intestine with spiral
valve. |