ammonites
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Harpoceras (ammonite)

Cephalopoda - Ammonitida - Hildoceratidae

Alternative spelling: Ammonites (Harpoceras)

Synonyms: Falcifericeras Breistroffer 1949 [objective synonym], Gallitellia Venturi and Ferri 2001, Glyptarpites, Harpoceras (Maconiceras) Buckman 1926, Harpoceratoides , Kolymoceras Dagis 1970, Lioceras Bayle 1878, Maconiceras Buckman 1926, Phaularpites , Tardarpoceras Buckman 1927

Parent taxon: Harpoceratinae according to M. K. Howarth 2013

Sister taxa: Cleviceras, Eleganticeras, Osperleioceras, Ovaticeras, Polyplectus, Pseudolioceras, Sphenarpites, Taffertia, Tiltoniceras

Subtaxa: Harpoceras (Harpoceras), Harpoceras (Maconiceras) soloniacense, Harpoceras eseri, Harpoceras nitescens

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Ecology: fast-moving nektonic carnivore