| superclass | (n) (biology) a taxonomic class below a phylum and above a class |
| superclass myriapoda | (n) used in some classifications to encompass the millipedes (Diplopoda) and centipedes (Chilopoda); formerly a large taxon including also the Pauropoda and Symphyla; the term Myriapoda now usually used synonymously with Diplopoda and limited to the millipedes |
| agnatha | (n) superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms, Syn. superclass Agnatha |
| chelicerata | (n) spiders; scorpions; horseshoe crabs, Syn. superclass Chelicerata |
| gnathostomata | (n) comprising all vertebrates with upper and lower jaws, Syn. superclass Gnathostomata |