Sea spiders are soft-bodied arthropods, found widely in modern oceans. For two-centuries there has been a controversy about the relationship of sea spiders to land spiders, scorpions, ticks and mites because of their unique body form. Sea spiders have a long proboscis and unusual limb structures used in mating and carrying brooding embryos. The fossil record of their relationship is sparse because of their delicate nature.

"This is the earliest adult fossil example, and it is preserved in extraordinary detail," said author Derek Briggs, professor of geology and geophysics, and Director of the Yale Institute of Biospheric Studies. "Volcanic ash that trapped ancient sea life in this location rapidly encased the creatures making a concrete-like cast of the bodies. The cavity later filled in with carbonate solids so we have a fossil record to study now."

To create a picture of the fossils, the specimens were ground away a few microns at a time, each slice digitally imaged, and then the whole reconstructed using computer graphics. The reconstruction suggests that these exotic animals are indeed related to land spiders, scorpions, mites and ticks.

The new species, Haliestes dasos,, represents the earliest known adult sea spider by 35 million years. Its large pincers place the sea spiders firmly within a larger grouping that includes scorpions, mites, ticks, the real spiders and the horseshoe crab. Despite its ancient, Silurian age the new species appears to have lived in a similar way to modern ones, on the seabed, or perhaps on spon
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Contact: Janet Rettig Emanuel
janet.emanuel@yale.edu
203-432-2157
Yale University
21-Oct-2004