Engonoceras retardum Hyatt 1903 (ammonite)

Cephalopoda - Ammonitida - Engonoceratidae

Full reference: A. Hyatt. 1903. Pseudoceratites of the Cretaceous. United States Geological Survey, Monograph 44:1-351

Belongs to Engonoceras according to W. J. Kennedy 2005

See also Hyatt 1903

Sister taxa: Engonoceras belviderense, Engonoceras complicatum, Engonoceras duboisi, Engonoceras elegans, Engonoceras emarginatum, Engonoceras gibbosum, Engonoceras hilli, Engonoceras iris, Engonoceras pierdenale, Engonoceras serpentinum, Engonoceras serpentinum, Engonoceras stolleyi, Engonoceras subjectum, Engonoceras wilkinsoni

Ecology: fast-moving nektonic carnivore

Average measurements (in mm): shell diameter 152.6

Distribution:

• Cretaceous of United States (3: Texas collections)

Total: 3 collections each including a single occurrence

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