Chondrichthyes - Sclerorhynchiformes - Ptychotrygonidae
Alternative combinations: Ischirhiza avonicola, Ischyrhiza avonicola
Synonym: Ischyrhiza monasterica Case and Cappetta 1997
Full reference: R. Estes. 1964. Fossil vertebrates from the Late Cretaceous Lance Formation, eastern Wyoming. University of California Publications in Geological Sciences 49:1-187
Belongs to Texatrygon according to B. M. Wynd et al. 2020
See also Becker et al. 2004, Becker et al. 2006, Bryant 1989, Cappetta 1973, Cappetta 1987, Cappetta and Case 1975, Case 1978, Case 1987, Case and Cappetta 1997, Case et al. 2017, Casier 1964, Estes 1964, Herman 1977, Hoganson et al. 2019, Schubert et al. 2017, Williamson et al. 1993, Wolberg 1985 and Wolberg 1985
Sister taxa: Texatrygon benningensis, Texatrygon copei, Texatrygon hooveri
Type specimens:
- Texatrygon avonicola: UCMP 53917, a tooth (complete rostral tooth). Its type locality is Lull 2 Quarry (UCMP V-5620), which is in a Maastrichtian terrestrial sandstone in the Lance Formation of Wyoming.
- Ischyrhiza monasterica: AMNH 12185, a tooth. Its type locality is South Sulphur River, Commerce, which is in a Maastrichtian marine claystone/sandstone in the Kemp Clay Formation of Texas.
Distribution:
• Paleocene of United States (1: Montana collection)
• Cretaceous of United States (44: Alabama, Arizona, Arkansas, Colorado, Delaware, Maryland, Montana, New Jersey, New Mexico, North Carolina, North Dakota, South Carolina, South Dakota, Texas, Wyoming)
Total: 45 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.