Cephalopoda - Ammonitida - Sonniniidae

Alternative combination: Ammonites polyacanthus

Belongs to Sonninia (Euhoploceras) according to J. Sandoval 2022

Sister taxa: Sonninia (Euhoploceras) adicra, Sonninia (Euhoploceras) berckhemeri, Sonninia (Euhoploceras) bifurcata, Sonninia (Euhoploceras) nannomorpha, Sonninia (Euhoploceras) playfordi, Stiphromorphites schucherti

Distribution: found only at USGS Mesozoic 29828. Gulch slightly northeast of old Washburn place (Jurassic of Oregon)

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Specimen images are retrieved through the ePANDDA API.