eurypterida การใช้

• It is of uncertain taxonomic placement within the order Eurypterida.
• Their morphology was so unusual that they have been thought to be an order separate to Eurypterida.
• "' Carcinosomatidae "'is a family of extinct arthropods in the class Eurypterida.
• Although the name Merostomata is still seen in textbooks, without reference to the Eurypterida, some have urged that this usage should be discouraged.
• More recently it has been recognised that a little-known, extinct group called Chasmataspida also shares features with Eurypterida, and the two groups were sometimes confused with one another.
• The Merostomata label originally did " not " include Eurypterida, although they were added in as a better understanding of the extinct group evolved ( see Merostomata for additional details ).
• A recent summary of the relationships between arachnids and their relatives recognised Eurypterida, Xiphosura and Arachnida as three major groups, but was not able to resolve the phylogenetic relationship of any shared details between them.