PBDB Taxon

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Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Nektaspidida

Taxonomy

Nektaspida was named by Raymond (1920). It was considered monophyletic by Ortega-Hernandez et al. (2013).

It was reranked as the class Nectaspidida by Peng et al. (2012); it was reranked as the class Nektaspidida by Lerosey-Aubril et al. (2017); it was reranked as the class Nektaspida by Mayers et al. (2019); it was corrected as Nektaspidida by Lerosey-Aubril et al. (2020).

It was assigned to Arthropoda by Budd (1999), Peng et al. (2012); to Trilobitomorpha by Ortega-Hernandez et al. (2013); to Artiopoda by Lerosey-Aubril et al. (2017); and to Trilobitomorpha by Mayers et al. (2019), Lerosey-Aubril et al. (2020).

Subtaxa

Buenaspis, Emucarididae, Naraoiidae, Petalopleura, Tarricoia

Synonyms

Naraoiida is an order. It is not extant.

It was replaced with Nektaspida by Mayers et al. (2019).

It was assigned to Trilobita by Sepkoski (2002).

Synonymy list

Year	Name and author
1920	Nektaspida Raymond
1999	Nektaspida Budd
2002	Naraoiida Sepkoski
2012	Nectaspidida Peng et al. p. 146
2013	Nektaspida Ortega-Hernandez et al. p. 38 fig. 6a
2017	Nektaspidida Lerosey-Aubril et al. p. 8 fig. 6
2019	Nektaspida Mayers et al. p. 33
2020	Nektaspidida Lerosey-Aubril et al. p. 515

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Ecdysozoa	Aguinaldo et al. 1997
—	Panarthropoda

Rank	Name	Author
phylum	Arthropoda	Latreille 1829
subphylum	Artiopoda	(Hou and Bergstrom)
superclass	Trilobitomorpha
order	Nektaspidida	(Raymond 1920)
order	Nektaspidida	(Raymond 1920)

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. †Nektaspidida Raymond 1920

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G. †Buenaspis Budd 1999

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†Buenaspis forteyi Budd 1999

Fm. †Emucarididae Paterson et al. 2010

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G. †Emucaris Paterson et al. 2010

†Emucaris fava Paterson et al. 2010

G. †Kangacaris Paterson et al. 2010

†Kangacaris zhangi Paterson et al. 2010

Fm. †Naraoiidae Walcott 1912

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Subfm. †Liwiinae Dzik and Lendzion 1988

G. †Liwia Dzik and Lendzion 1988

†Liwia convexa Lendzion 1975

†Liwia plana Lendzion 1975

G. †Soomaspis Fortey and Theron 1995

G. †Tariccoia Hammann et al. 1990

†Tariccoia arrusensis Hammann et al. 1990

†Tariccoia tazagurtensis Pérez-Peris et al. 2020

G. †Misszhouia Chen et al. 1997

†Misszhouia canadensis Mayers et al. 2019

†Misszhouia longicaudata Zhang and Hou 1985

G. †Naraoia Walcott 1912

†Naraoia arcana Mayers et al. 2019

†Naraoia bertiensis Caron et al. 2005

†Naraoia compacta Walcott 1912

†Naraoia magna Mayers et al. 2019

†Naraoia spinosa Zhang and Hou 1985

†Naraoia taijiangensis Peng et al. 2012

Subcl. †Petalopleura Hou and Bergstrom 1997

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G. †Cindarella Chen et al. 1996

†Cindarella eucalla Chen et al. 1996

G. †Sinoburius Hou et al. 1991

†Sinoburius lunaris Hou et al. 1991

G. †Xandarella Hou et al. 1991

†Xandarella spectaculum Hou et al. 1991

G. †Tarricoia Hammann et al. 1990

Invalid names: Naraoiida [replaced]

Diagnosis

Reference	Diagnosis
B. Mayers et al. 2019	Trilobitomorph artiopodans with the following characters as their ground pattern: lateral eyes reduced or absent; hypostome with natant attachement; extensive articulation overlap between unfused trunk tergites; fused pleurae not forming lateral spines. (Emended from Raymond 1920.)