# Baltoniodus

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{{Short description|Extinct genus of jawless fishes}}
{{Automatic taxobox
| fossil_range = {{fossil range|Dapingian|Sandbian}}
| taxon = Baltoniodus
| authority = [Lindström](/source/Maurits_Lindstr%C3%B6m), [1971](/source/1971_in_paleontology)<ref>Vom Anfang, Hochstand und Ende eines Epikontinentalmeeres. Maurits Lindström, Geologische Rundschau, March 1971, Volume 60, Issue 2, pages 419-438, {{doi|10.1007/BF02000464}}</ref>
| subdivision_ranks = Species
| subdivision = 
* †''Baltoniodus alobatus''
* †''Baltoniodus cooperi''
* †''Baltoniodus gerdae''
* †''Baltoniodus medius''
* †''Baltoniodus navis''
* †''Baltoniodus norrlandicus''
* †''Baltoniodus prevariabilis''
* †''Baltoniodus triangularis''
* †''Baltoniodus variabilis''
| synonyms = 
}}

'''''Baltoniodus''''' is an extinct genus of [conodont](/source/conodont)s.

==Use in stratigraphy==
The base of the [Dapingian](/source/Dapingian), the first stage of the [Middle Ordovician](/source/Middle_Ordovician), is defined as the [first appearance](/source/first_appearance_datum) of ''Baltoniodus triangularis''.<ref name=Harper2023>{{cite journal|author1=David A. T. Harper|author2=Tõnu Meidla|author3=Thomas Servais|date=May 10, 2023|url=https://pubs.geoscienceworld.org/gsl/books/edited-volume/2475/chapter/138444251/A-short-history-of-the-Ordovician-System-from|title=A short history of the Ordovician System: from overlapping unit stratotypes to global stratotype sections and points|journal=Geological Society, London, Special Publications |volume=532 |issue=1 |pages=13–30 |publisher=[The Geological Society of London](/source/The_Geological_Society_of_London)|doi=10.1144/SP532-2022-285|bibcode=2023GSLSP.532..285H |language=en|archive-url=https://web.archive.org/web/20240518082017/https://pubs.geoscienceworld.org/gsl/books/edited-volume/2475/chapter/138444251/A-short-history-of-the-Ordovician-System-from|archive-date=2024-05-18|url-status=live}}</ref>

The [Whiterock Stage](/source/Whiterock_Stage) refers mainly to the early Middle Ordovician in North America, it is often used in the older literature in a global sense. The Whiterock Stage is given a range from 471.8 (ca. 472) to 462 m.y.a., spanning close to 10 million years. Officially its start is defined by the potentially lowest occurrence of the conodont ''[Protoprioniodus aranda](/source/Protoprioniodus_aranda)'' or ''Baltoniodus triangularis''.

''B. gerdae'' has been found in the early [Sandbian](/source/Sandbian) [Bromide Formation](/source/Bromide_Formation), in Oklahoma, USA.

==References==
{{Reflist}}

==External links==
* {{fossilworks|id=33859|title=''Baltoniodus''|access-date=1 July 2016}}

{{Conodonts|3}}
{{Taxonbar|from=Q25349822}}

Category:Prioniodontida genera
Category:Ordovician conodonts
Category:Middle Ordovician first appearances
Category:Late Ordovician extinctions
Category:Bromide Formation

{{conodont-stub}}

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Adapted from the Wikipedia article [Baltoniodus](https://en.wikipedia.org/wiki/Baltoniodus) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Baltoniodus?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.