New Cretaceous lungfishes (Dipnoi, Ceratodontidae) from western North America. (28th November 2016)
- Record Type:
- Journal Article
- Title:
- New Cretaceous lungfishes (Dipnoi, Ceratodontidae) from western North America. (28th November 2016)
- Main Title:
- New Cretaceous lungfishes (Dipnoi, Ceratodontidae) from western North America
- Authors:
- Frederickson, Joseph A.
Cifelli, Richard L. - Abstract:
- Abstract: Ceratodontid lungfishes are generally rare, poorly represented elements of North America's Mesozoic ecosystems, with previously known maximum diversity in the Late Jurassic. Herein we describe four new species of the form genus Ceratodus, from the Cretaceous of the Western Interior, considerably expanding fossil representation of post-Triassic dipnoans in North America. To model taxonomic and morphologic diversity, we adopt a four-fold system of phenetically based species groups, named for exemplars from the Morrison Formation. Ceratodus kirklandi n. sp. ( Potamoceratodus guentheri group) and C . kempae n. sp. ( C . frazieri group) represent a hitherto unsampled time interval, the Valanginian. Ceratodus nirumbee n. sp. and C . molossus n. sp. extend the temporal ranges of the C . fossanovum and C . robustus groups upward to the Albian and Cenomanian, respectively. These new occurrences show that ceratodontids maintained their highest diversity from the Late Jurassic through the mid-Cretaceous (Albian–Cenomanian), an interval of ~60 Myr. The existing record suggests that some of the later (mid-Cretaceous) ceratodontids may have been tolerant of salt water; to date, there is no evidence that they aestivated. Only a few occurrences are known from horizons younger than Cenomanian. Demise of ceratodontids appears to be part of a broader pattern of turnover that occurred at the Cenomanian-Turonian boundary in North America.
- Is Part Of:
- Journal of paleontology. Volume 91:Number 1(2017)
- Journal:
- Journal of paleontology
- Issue:
- Volume 91:Number 1(2017)
- Issue Display:
- Volume 91, Issue 1 (2017)
- Year:
- 2017
- Volume:
- 91
- Issue:
- 1
- Issue Sort Value:
- 2017-0091-0001-0000
- Page Start:
- 146
- Page End:
- 161
- Publication Date:
- 2016-11-28
- Subjects:
- Fossils -- Classification -- Periodicals
Paleontology -- Periodicals
Paléontologie -- Périodiques
Fossils -- Classification
Paleontology
Paleontologie
Periodicals
Electronic journals
560.5 - Journal URLs:
- http://journals.cambridge.org/action/displayJournal?jid=JPA ↗
http://jpaleontol.geoscienceworld.org/ ↗
http://www.bioone.org/bioone/?request=get-journals-list&issn=0022-3360 ↗
http://www.jstor.org/journals/00223360.html ↗ - DOI:
- 10.1017/jpa.2016.131 ↗
- Languages:
- English
- ISSNs:
- 0022-3360
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library HMNTS - ELD Digital store
- Ingest File:
- 205.xml