Nektaspida
Nektaspida (also called Naraoiida, Nectaspia and Nectaspida) is an extinct order of soft-bodied arthropods proposed by Raymond in 1920; its taxonomic status is uncertain. Specimens are known from the early Cambrian to the upper Silurian periods. Whittington (1985) placed the order in the Trilobita. Cotton & Braddy (2000) place it in a new "Trilobite clade" containing the Trilobita, recognizing the close affinities of the nektaspids to trilobites. However this necessitates the inclusion of genera that look very little like trilobites. Strictly speaking, it is best placed in the stem-group to the chelicerates.
order (taxonomy)
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Nektaspida
Nektaspida (also called Naraoiida, Nectaspia and Nectaspida) is an extinct order of soft-bodied arthropods proposed by Raymond in 1920; its taxonomic status is uncertain. Specimens are known from the early Cambrian to the upper Silurian periods. Whittington (1985) placed the order in the Trilobita. Cotton & Braddy (2000) place it in a new "Trilobite clade" containing the Trilobita, recognizing the close affinities of the nektaspids to trilobites. However this necessitates the inclusion of genera that look very little like trilobites. Strictly speaking, it is best placed in the stem-group to the chelicerates.
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NectaspidaFichier:Naraoia spin ...... oologie Portail de la zoologie
@fr
Nektaspida (also called Naraoi ...... tem-group to the chelicerates.
@en
Nektaspida é uma ordem de artr ...... o e extinguiu-se no Siluriano.
@pt
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696,773,126
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Naraoia spinosa
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NectaspidaFichier:Naraoia spin ...... groupe rend l'ordre superflu.
@fr
Nektaspida (also called Naraoi ...... tem-group to the chelicerates.
@en
Nektaspida é uma ordem de artr ...... o e extinguiu-se no Siluriano.
@pt
label
Nectaspida
@fr
Nektaspida
@en
Nektaspida
@pt