Eurypteroidea are an extinct superfamily of eurypterids. Eurypteroidea, which lived from the Ordovician to Permian periods, were characterized by their last pair of prosomal (head) appendages, which were developed as swimming legs, carrying paddles formed by the expansion of the two penultimate joints. ==Families== ...
Found on
http://en.wikipedia.org/wiki/Eurypteroidea
• (n. pl.) An extinct order of Merostomata, of which the genus Eurypterus is the type. They are found only in Paleozoic rocks.
Found on
http://thinkexist.com/dictionary/meaning/eurypteroidea/
Eu·ryp`te·roi'de·a noun plural [ New Latin See
Eurypteroid .]
(Paleont.) An extinct order of Merostomata, of which the genus Eurypterus is the type. They are found only in Paleozoic rocks. [ Written also
Eurypterida .]
Found on
http://www.encyclo.co.uk/webster/E/74
No exact match found.
