Merostomoidea

Merostomoidea is a paraphyletic group of fossil arthropods, considered a transitional form between trilobites and true chelicerates.

Merostomoidea Temporal range: Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata?
Class:	Merostomoidea† Størmer, 1944
Orders
Limulavida Emeraldellida