Superorder Lampridiomorpha Order Lampriformes (opahs, oarfishes, and relatives) No subocular shelf and pelvic spine; some have a peculiar condition (hypurostegy) in which caudal rays are expanded. Medium to large size; to about 2 metres (about 7 feet) and 300 kg (660 pounds) in the opah (Lampridae)
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