Cephalopoda - Ammonitida - Sonniniidae
Alternative combination: Sonninia (Alaskinia) alaskensis
Full reference: G. E. G. Westermann. 1969. The ammonite fauna of the Kialagvik Formation at Wide Bay, Alaska Peninsula. Part II. Sonninia sowerbyi zone (Bajocian). Bulletins of American Paleontology 57:1-226
Belongs to Sonninia (Alaskoceras) according to G. E. G. Westermann 1969
See also Westermann 1978
Sister taxa: none
Type specimen: McM J 1021, a shell. Its type locality is Westermann WA10, Wide Bay (scree), which is in a Bajocian marine shale in the Kialagvik Formation of Alaska.
Ecology: fast-moving nektonic carnivore
Average measurements (in mm): shell diameter 55.1
Distribution:
• Jurassic of United States (6: Alaska collections)
Total: 6 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.