Final answer:
A newly discovered organism with 10 jointed legs would likely be classified as a myriapod, a subphylum of arthropods that includes centipedes and millipedes and is characterized by a high variation in the number of legs.
Step-by-step explanation:
If you discovered a new organism with 10 jointed legs, it is reasonable to expect that it could be classified within a group of arthropods known as myriapods. Myriapods are characterized by having segmented bodies with a varying number of legs, typically ranging from 10 to 750, and including familiar creatures such as millipedes and centipedes. These organisms are primarily terrestrial and favor humid environments.
Unlike hexapods, which have six legs (three pairs), or crustaceans with biramous appendages, myriapods have uniramous ("one branched") legs. Given the number of legs on this new organism, and the fact that each body segment can have a pair of these jointed appendages, identifying it as a myriapod would be consistent with other members of this subphylum.