{{Short description|Extinct genus of jawless fishes}} {{Automatic taxobox | fossil_range = {{fossil range|Dapingian|Sandbian}} | taxon = Baltoniodus | authority = Lindström, 1971<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 conodonts.
==Use in stratigraphy== The base of the Dapingian, the first stage of the Middle Ordovician, is defined as the first appearance 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|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 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'' or ''Baltoniodus triangularis''.
''B. gerdae'' has been found in the early Sandbian 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}}