Rafinesque originally described the Red-spotted Newt Notophthalmus viridescens viridescens and the Peninsula Newt Notophthalmus viridescens piaropicola in 1820. Since that time, two other subspecies of the genus Notophthalmus have been described. For the sake of completeness, they are the Central Newt Notophthalmus viridescens louisianensis, which was originally described by Wolterstorff in 1914 and the Broken Stripe Newt Notophthalmus viridescens dorsalis as described by Harlan in 1828[i].
When it comes to decorating the enclosure of the Spanish Ribbed Newt Pleurodeles waltl, you must consider whether you want live or artificial plants. Whichever way you choose to go, you should plant very heavily. As I have said elsewhere in this Blog, any of the fish safe aquarium plants will work just fine.