Abstract
A nearly complete right mandibular tooth plate of Ischyodus bifurcatus Case (Holocephali: Chimaeroidei) is reported from the Point Loma Formation (upper Campanian) of the Upper Cretaceous Rosario Group in southern California, USA. The individual is estimated to have measured nearly 1 m in total body length. Remains of I. bifurcatus have been reported from marine rocks deposited in epicontinental seas and continental shelf paleoenvironments of temperate latitudes in the Northern Hemisphere. Previous records of the species consist of specimens from Santonian to Maastrichtian strata of the US (Delaware, New Jersey, North Carolina, Georgia, Alabama, Arkansas, Montana, and Wyoming), Sweden, and European Russia. The tooth plate described herein is the first verifiable record of I. bifurcatus from California, and, more significantly, represents the only known definite Mesozoic record of Ischyodus from the entire North Pacific region.
| Original language | English |
|---|---|
| Pages (from-to) | 364-372 |
| Number of pages | 9 |
| Journal | Paleontological Research |
| Volume | 22 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1 Oct 2018 |
| Externally published | Yes |
Fingerprint
Keywords
- chimaeroid fish
- Ischyodus
- Late Cretaceous
- North Pacific
- tooth plate
Cite this
}
The Late Cretaceous Chimaeroid Fish, Ischyodus bifurcatus Case (Chondrichthyes : Holocephali), from California, USA, and Its Paleobiogeographical Significance. / Johnson-Ransom, Evan D.; Popov, Evgeny V.; Deméré, Thomas A.; Shimada, Kenshu.
In: Paleontological Research, Vol. 22, No. 4, 01.10.2018, p. 364-372.Research output: Contribution to journal › Article
TY - JOUR
T1 - The Late Cretaceous Chimaeroid Fish, Ischyodus bifurcatus Case (Chondrichthyes
T2 - Holocephali), from California, USA, and Its Paleobiogeographical Significance
AU - Johnson-Ransom, Evan D.
AU - Popov, Evgeny V.
AU - Deméré, Thomas A.
AU - Shimada, Kenshu
PY - 2018/10/1
Y1 - 2018/10/1
N2 - A nearly complete right mandibular tooth plate of Ischyodus bifurcatus Case (Holocephali: Chimaeroidei) is reported from the Point Loma Formation (upper Campanian) of the Upper Cretaceous Rosario Group in southern California, USA. The individual is estimated to have measured nearly 1 m in total body length. Remains of I. bifurcatus have been reported from marine rocks deposited in epicontinental seas and continental shelf paleoenvironments of temperate latitudes in the Northern Hemisphere. Previous records of the species consist of specimens from Santonian to Maastrichtian strata of the US (Delaware, New Jersey, North Carolina, Georgia, Alabama, Arkansas, Montana, and Wyoming), Sweden, and European Russia. The tooth plate described herein is the first verifiable record of I. bifurcatus from California, and, more significantly, represents the only known definite Mesozoic record of Ischyodus from the entire North Pacific region.
AB - A nearly complete right mandibular tooth plate of Ischyodus bifurcatus Case (Holocephali: Chimaeroidei) is reported from the Point Loma Formation (upper Campanian) of the Upper Cretaceous Rosario Group in southern California, USA. The individual is estimated to have measured nearly 1 m in total body length. Remains of I. bifurcatus have been reported from marine rocks deposited in epicontinental seas and continental shelf paleoenvironments of temperate latitudes in the Northern Hemisphere. Previous records of the species consist of specimens from Santonian to Maastrichtian strata of the US (Delaware, New Jersey, North Carolina, Georgia, Alabama, Arkansas, Montana, and Wyoming), Sweden, and European Russia. The tooth plate described herein is the first verifiable record of I. bifurcatus from California, and, more significantly, represents the only known definite Mesozoic record of Ischyodus from the entire North Pacific region.
KW - chimaeroid fish
KW - Ischyodus
KW - Late Cretaceous
KW - North Pacific
KW - tooth plate
UR - http://www.scopus.com/inward/record.url?scp=85054520751&partnerID=8YFLogxK
U2 - 10.2517/2018PR004
DO - 10.2517/2018PR004
M3 - Article
AN - SCOPUS:85054520751
VL - 22
SP - 364
EP - 372
JO - Paleontological Research
JF - Paleontological Research
SN - 1342-8144
IS - 4
ER -