Cephalopoda - Ammonitida - Sonniniidae
Synonym: Sonninia (Alaskoceras) Westermann 1969 [replaced name]
Full reference: G. Westermann. 1978. Alaskinia nom. nov. for Alaskoceras Westermann, 1969, non Miller & Kummel, 1945; Jurassic Ammonitina. Journal of Paleontology 52:604
Parent taxon: Sonninia according to M. K. Howarth 2013
See also Westermann 1969 and Westermann 1978
Sister taxa: Sonninia (Euhoploceras), Sonninia (Papilliceras), Sonninia (Poecilomorphus), Sonninia (Sonninia), Sonninia altecostata, Sonninia alternata, Sonninia argentinica, Sonninia bodenbenderi, Sonninia crassa, Sonninia crassinuda, Sonninia espinazitensis, Sonninia fascicostata, Sonninia intumescens, Sonninia mirabilis, Sonninia nuda, Sonninia stelzneri, Sonninia subdeltafalcata, Sonninia subtrigonata, Sonninia tuxedniensis, Waagenia parrasensis
Subtaxa: Sonninia (Alaskinia) alaskensis
Ecology: fast-moving nektonic carnivore
Distribution:
• Jurassic of United States (6: Alaska collections)
Total: 6 collections each including a single occurrence