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Horseshoe crabs and extinct forms
Answer for the clue "Horseshoe crabs and extinct forms ", 9 letters:
xiphosura
Word definitions for xiphosura in dictionaries
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Xiphura \Xi*phu"ra\, n. pl. [NL., from Gr. xi`fos sword + ? tail.] (Zo["o]l.) Same as Limuloidea . Called also Xiphosura .
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 ...