Cephalopoda - Ammonitida - Placenticeratidae
Alternative combination: Ammonites syrtalis
Synonyms: Ammonites guadalupae Roemer 1849, Placenticeras guadalupae Roemer 1849, Placenticeras intermedium Johnson 1903, Placenticeras newberryi Hyatt 1903, Placenticeras planum Hyatt 1903, Placenticeras rotundatum Johnson 1903, Placenticeras sancarlosense Hyatt 1903, Stantonoceras pseudocostatum Johnson et al. 1964
Belongs to Placenticeras according to P. L. Sealey and S. G. Lucas 2019
See also Böse 1928, Kennedy and Cobban 1991, Kennedy and Cobban 1993, Kennedy et al. 2001 and Stephenson 1914
Sister taxa: Placenticeras benningi, Placenticeras bidorsatum, Placenticeras cumminsi, Placenticeras fritschi, Placenticeras intercalare, Placenticeras kaffrarium, Placenticeras kolbajense, Placenticeras maherndli, Placenticeras mediasiaticum, Placenticeras memoriaschloenbachi, Placenticeras merenskyi, Placenticeras orbignyanum, Placenticeras paraplanum, Placenticeras placenta, Placenticeras polyopsis, Placenticeras pseudoplacenta, Placenticeras semiornatum, Placenticeras tamulicum, Placenticeras vancouverense, Placenticeras vredenburgi, Placenticeras whitfieldi
Ecology: fast-moving nektonic carnivore
Distribution:
• Cretaceous of Canada (2: Alberta collections), France (1), Mexico (4), United States (11: Alabama, Colorado, Delaware, Maryland, Mississippi, New Jersey, New Mexico, Texas)
Total: 18 collections including 19 occurrences
Specimen images are retrieved through the ePANDDA API.
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