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The subfamily Arestoceratinae van Hoepen (1942), long relegated to the synonymy of Mortoniceratinae (Wright, 1957, 1981, 1996), is resurrected for a phyletically-distinct group of strongly-compressed, generally bituberculate, late Albian brancoceratid ammonites in which there is a strong tendency for the umbilical seam to egress and the narrow subtabulate keeled venter to become fastigiate in later...