In 1966, carving specialist Jock Malcolm McEwen proposed a sequence of changes in the form. Earlier examples, he wrote, had triangular scales along the abdomen and head. Around 1880 the body scales disappeared and head scales became horns; by 1890 some figures had neither. His sequence ends around 1900 with the fish tail surviving as other distinctive features fall away. At Wairaka, Whakatāne, he identifies a merger with European mermaid imagery, including coiled hair and breasts. [4]
McEwen also follows Gilbert Archey’s suggestion that the curled lower form developed from a human figure with one extended, curving leg. That is an argument about carving, not a recovered biography of a creature. It offers a different explanation from a maker simply combining half a person with half a fish. His proposed stages describe a historical interpretation of change, rather than a timetable established for every work. [4]