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Protactinocerida is a
proposed order of Late
Cambrian nautiloid cephalopods.
Their fossils have only been
found in the Late
Cambrian (late Jiangshanian...
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contains several exclusively Cambrian cephalopod orders: Plectronocerida,
Protactinocerida, and Yanhecerida.
Under some
classification schemes, the plectronoceratoid...
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establishment of
three Upper Cambrian orders, the Plectronocerida,
Protactinocerida, and Yanhecerida;
separation of the
pseudorthocerids as the Pseudorthocerida...
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phylogenetically related. They are: †Plectronoceratoidea = †Plectronocerida, †
Protactinocerida, †Yanhecerida, and †Ellesmerocerida. †Endoceratoidea = †Endocerida...
- (1979). "Late
Cambrian cephalopods of
North China. Plectronocerida,
Protactinocerida (ord. nov.) and
Yanhecerida (ord. nov.)". Acta
Palaeontologica Sinica...
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other three plectronoceratoid orders, the
Ellesmerocerida and
Protactinocerida and Yanhecerida. The
Plectronoceratidae gave rise to the
other ellesmerocerid...
- al 1979. Late
Cambrian Cephalopods of
North China, Plectroncerida,
Protactinocerida (Ord, Nov.) and
Yanhecerida (Ord, Nov.) Acta
Palaeontologica Sinica...
- 1979 Late
Cambrian Cephalopods of
North China -- Plectronocerida,
Protactinocerida (Ord Nov) and
Yanhecerida (Ord Nov) Chen, J. Y.; Teichert, C. (1983)...
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introduced by Chen and
Teichert in 1983, the
Cambrian Yanhecerida and
Protactinocerida. The Plectronocerida, also Cambrian,
includes forms once
included in...
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Georginidae relate to
older stocks is unclear. The
Upper Cambrian Protactinocerida have been
suggested as
being ancestral but none are
known to have gone...
