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Naraoiidae
Taxonomy
Naraoiidae was named by Walcott (1912). Its type is Naraoia.
It was assigned to Nectaspidida by Peng et al. (2012); to Nektaspida by Mayers et al. (2019); and to Nektaspidida by Lerosey-Aubril et al. (2020).
It was assigned to Nectaspidida by Peng et al. (2012); to Nektaspida by Mayers et al. (2019); and to Nektaspidida by Lerosey-Aubril et al. (2020).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1912 | Naraoiidae Walcott |
| 2012 | Naraoiidae Peng et al. pp. 146 - 148 |
| 2019 | Naraoiidae Mayers et al. pp. 36 - 38 |
| 2020 | Naraoiidae Lerosey-Aubril et al. p. 515 |
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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.
Fm. †Naraoiidae Walcott 1912
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Peng et al. 2012 | A dorsal exoskeleton divided by a single transverse articulation into two shields, a cephalic shield and a posterior shield. The cephalic shield is round to half-round in dorsal view, devolving spinose or nonspinose in genal angles, both lateral margins and rear margin of po- sterior shield; one pair of lateral project antennas in ante- rior cephalic area. Axial lobe weak, both lateral axial lobe with alimentary system, including alimentary diverticulae and alimentary canal, with appendages in abdominal re- gion. | |
| B. Mayers et al. 2019 | Nektaspid trilobitomorphs with the following characters: cephalon with ovoid truncated shape; convex posterior cephalic margin; presence of ramifications on secondary digestive structures; anterior tapering of trunk relative to cephalic shield; complete effacement of tergite boundaries within fused section of the trunk. (Emended from Zhang et al. 2007.) |