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Megasphaeroceras is an ammonite genus included in Sphaeroceratidae, a family of ammonoid cephalopods characterized by their spheroidal shells with markedly...

Medlicottia Meekoceras Megalytoceras Megaphyllites Megapronorites Megasphaeroceras Megatyloceras Meginoceras Melagathiceras Melchiorites Melonites Melvilloceras...

†Meekoceras †Meekoceras gracilitatis – type locality for species †Megasphaeroceras †Naticopsis – tentative report †Nemacanthus †Nemacanthus elegans –...

†Meekoceras olivieri – type locality for species †Megalosauripus †Megasphaeroceras †Melvius †Melvius chauliodous – or unidentified comparable form †Meniscoessus...

mushbachanum †Meekoceras patelliforme †Meekoceras sanctorum †Megasphaeroceras †Megasphaeroceras rotundum – or unidentified related form †Metadagnoceras †Metadagnoceras...

†Meekoceras olivieri – type locality for species †Megalosauripus †Megasphaeroceras †Megasphaeroceras rotundum – or unidentified comparable form †Melvius †Melvius...

†Megalneusaurus †Megalneusaurus rex – type locality for species †Megasphaeroceras †Megasphaeroceras rotundum – or unidentified comparable form †Meleagrinella...

†Mecochirus †Megalneusaurus †Megalneusaurus rex – type locality for species †Megasphaeroceras †Melvius †Meniscoessus †Meniscoessus intermedius †Meniscoessus robustus...