Multiple choice Taxonomy of vertebrate divides fishes in to which two basic groups? Jawed and jawless Gilled and non-gilled Mammalian and non-mammalian Nematodes and non-nematodes Reveal answer Fill a bubble to check yourself A Correct answer Explanation Vertebrates are classified into two main groups based on the presence of jaws: Agnatha (jawless fish) and Gnathostomata (jawed vertebrates). Other options do not represent primary taxonomic divisions of fish.