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Answer for the clue "Horseshoe crabs and extinct forms ", 9 letters:
xiphosura

Word definitions for xiphosura in dictionaries

Wikipedia Word definitions in Wikipedia
The Xiphosura are an order of marine chelicerates that includes a large number of extinct lineages and only four extant species in the family Limulidae , which include the horseshoe crabs . The group has hardly changed in millions of years; the modern horseshoe ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Xiphosura \Xiph`o*su"ra\, n. pl. See Xiphura .