Your current chain: State of matter Life > Kingdom Animalia > Phylum Arthropoda > Subphylum Chelicerata > Class Arachnida > Order Scorpiones > Suborder Neoscorpionina > Infraorder Orthosterni > Parvorder Buthida
(From Wikipedia) Orthosterni is an infraorder within the order Scorpions.
FACT: Some ancient Paleozoic fossils showed that some early scorpions possessed compound eyes!
Currently discovered: 1/3 Superfamilies
Superfamily