Classification of the species Ectocion collinus
†Ectocion collinus Russell 1929
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Invalid names: Gidleyina montanensis Gidley 1935 [synonym], Gidleyina silberlingi Gidley 1935 [synonym], Gidleyina wyomingensis Gazin 1956 [synonym], Meniscotherium semicingulatum Russell 1929 [synonym], Tetraclaenodon superior Simpson 1935 [synonym]