Systema naturæ - nature Universum - universe see [unranked] Mundus Plinius naturalia - natural bodies Regnum Animale nom. inval. - animal kingdom see Kingdom Animalia Linnaeus, 1758 Class Pisces nom. inval. - fishes see Class Pisces Linnaeus, 1758 Order Malacopterygii nom. inval. see Class Pisces Linnaeus, 1758 Genus Syngnathus nom. inval. see Genus Syngnathus Linnaeus, 1758 1 Acus lumbr. nom. inval. 2 Acus Aristoteles, nom. inval. 3 Hippocampus nom. inval.