Template talk:Taxonomy/Nesonektris

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Questionable assignement to Didazoonidae

I think Nesonektris should be moved back to having the class Vetulicolida as its parent. Li et al. 2018 emended the diagnosis of Didazoonidae to:

Bilaterally symmetrical animal with clear subdivision of body into presumed anterior and posterior sections. Neither the subquadrate to ovoid anterior section nor the posterior section is biomineralized. The anterior section has a large, circular opening at the presumed anterior end of the animal, posterior of which are six subdivisions demarcated by five lines; five, presumed laterally positioned, oval openings on both sides of the anterior section coincide with the lines of subdivision. Segments of posterior section may bear up to six annulations.

Earlier in the paper, the authors define the terminology "lateral pouches/openings" to replace what they view is the unwarranted assumption that these are gill pouches. A later paragraph mentions the "circumventing feature" (a.k.a. oral disc) as important in diagnosing as well, which matches the original definition of the family which hinged on the oral disc and the less robust body walls.

The authors reassigned Nesonektris without explanation aside from a line in a chart. The morphological information in the Nesonektris row of the chart includes "Anterior opening: Anterior edge vertical", "Anterior section: Subquadrate in lateral view, lateral groove narrow", "Lateral pouches: no pouches observed", "Posterior section: Internal rod-like structure extends along axis of posterior section", and "Anus: Terminal."

Notably, the above does not fit their own diagnosis, or the older diagnosis for Didazoonidae! No oral disc, no lateral pouches, while all other didazoonids in the chart note those features. Presumably for this reason, PBDB has not accepted this reassignment, although they accepted the reassignment of Yuyuanozoon to Didazoonidae from the same paper.

I think Wikipedia should follow PBDB here unless/until another secondary source endorses the reassignment. Mussini et al. (2024)'s cladogram also placed Nesonektris far from the didazoonids but exactly where Garcîa-Bellido et al. (2014) theorized it would be in their paper on its discovery. Someone went to the trouble of adding Li et al. 2018 to PBDB and using it as the authority for all of the other didazoonids (including Yuyuanozoon), Didazoonidae, and Vetulicolata, but chose not to change Nesonektris. That seems significant.

Ixat totep (talk) 00:14, 13 December 2024 (UTC)[reply]