[7] A 2010 study explained size differences among them as sexual dimorphism.

[2] The cladogram below follows a 2009 analysis by Bunce et al.:[10] Megalapteryx didinus D. robustus D. novaezealandiae P. australis P. elephantopus P. geranoides Anomalopteryx didiformis Emeus crassus Euryapteryx curtus It was a ratite and a member of the lesser moa family.

[11] It was one of the most widespreas moa species, inhabiting open areas.

Its habitat was in the lowlands (duneland, forest, shrubland, and grassland).

[12] Of the specimens traditionally given the name Euryapteryx gravis, the eggs has an average length of 205mm and width of 143mm, while the group traditionally assigned to the name Euryapteryx curtus had an average length of 122mm and width of 94mm.