-oidea

-oidea

suffix forming plural proper nouns
forming the names of zoological classes or superfamilies: Crinoidea; Canoidea.
[from New Latin, from Latin -oīdēs -oid]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

-oidea

a suffix used in the names of zoological classes or entomological superfamilies.
[< New Latin, pl. of Greek -oeidēs -oid; see -a1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Remarks: Hoffstetter (1974) proposed Simiiformes as a replacement name for Anthropoidea, apparently on the basis of insufficient grounds (Delson, 1977), although it has several advantages such as avoiding the standard superfamily ending in -oidea for a taxon above the family-group level (see Delson, 1977, and Hoffstetter, 1982, for further details).