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A fact from Bianchengichthys appeared on Wikipedia's Main Page in the Did you know column on 18 March 2022 (check views). The text of the entry was as follows:
Latest comment: 2 years ago4 comments3 people in discussion
The following is an archived discussion of the DYK nomination of the article below. Please do not modify this page. Subsequent comments should be made on the appropriate discussion page (such as this nomination's talk page, the article's talk page or Wikipedia talk:Did you know), unless there is consensus to re-open the discussion at this page. No further edits should be made to this page.
... that the discovery of Bianchengichthys may shed new light on the evolution of all jawed vertebrates? Source: Li, Q., Zhu, Y. A., Lu, J., Chen, Y., Wang, J., Peng, L., ... & Zhu, M. A New Silurian Fish Illuminates the Early Evolution of Gnathostome Appendages and Dentition. Available at SSRN 3773784. Li, Q., Zhu, Y.A., Lu, J., Chen, Y., Wang, J., Peng, L., Wei, G. and Zhu, M., 2021. A new Silurian fish close to the common ancestor of modern gnathostomes. Current Biology.
It generally means that the animal's skull includes a maxilla or a structure that is evolutionarily homologous to a maxilla in other jawed vertebrates. One of the pressing issues in placoderm paleontology is that a lot of bones in the skull and thorax may not be homologous to other skull characteristics. I would guess that the quotation marks were related to the use of the term by the team who published the species description. Hope this helps Ryan shell (talk) 13:10, 18 March 2022 (UTC)Reply
In addition to the points Ryan shell made, the term "maxillate" is being used as an informal term to group together various, Silurian-aged, arthrodire-like placoderms who share anatomical features with crown-group gnathostomes (i.e., from sharks to humans). Thus, the citation marks.--Mr Fink (talk) 14:04, 18 March 2022 (UTC)Reply
user:Ryan shell and user:Apokryltaros, thanks for clarifications! I think they support my view: The articles need to either explain the term, or wikilink another article that does. It could be as in maxillate fish, or a Maxillate fish article should be created. Unless there is a strict sense of Maxillate fish, different from the informal sense used here, the quotes should be removed.--Nø (talk) 10:30, 20 March 2022 (UTC)Reply
I dont usually write about paleo fish on wiki, but my reading of the term is that the term isn't quite notable on its own right now. One option might be to link to wtk for the word "maxillate," though I wouldn't be against an article on 'maxillate palcoderm" despite the term being more gradistic than cladistic. Curious what others would have to say, either in this discussion or if it were proposed to a wikiproject 15:40, 20 March 2022 (UTC)
I'm hesitant to start an article about "maxillate placoderm" if only because it's not an official term yet, and to make an article about it before these fishes' higher taxonomy are formalized may run afoul of WP:Synthesis. Perhaps we could eventually start a more in depth subsection in Placoderm, though?--Mr Fink (talk) 16:20, 20 March 2022 (UTC)Reply