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The shortnose spurdog , Squalus megalops , is a dogfish , a member of the family Squalidae , found at depths from 30 to 750 m on the eastern coast Australia , Its length is up to 71 cm .. Squalidae. Squalidae. Squalus. Squalus. dogfish. Squaliformes. family. family ( biology ). Australia. Australia. Growth model based estimates of age suggest that the shortnose spurdog can live up to 75 years old .