Cephalopoda - Ammonitida - Sonniniidae

Alternative combination: Grammoceras nannodes

Belongs to Asthenoceras according to G. E. G. Westermann 1969

Sister taxa: none

Ecology: fast-moving nektonic carnivore

Average measurements (in mm): shell diameter 22.2

Distribution: found only at Westermann WA10, Wide Bay (11 m) (Jurassic of Alaska)

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Specimen images are retrieved through the ePANDDA API.