 | Scientists used computer reconstruction to create this image of the ancient Haliestes species of sea spider (above left, artificially colored), and a modern sea spider, Nymphon (bleached, below left), which is about 50% larger and has longer legs. |
Volcanic ash that encased and preserved sea life in the Silurian age 425 million years ago near Herefordshire, United Kingdom, has yielded fossils of a new species of ancient sea spider, or pycnogonid, one of the most unusual types of arthropod in the seas today.
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, which are 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," says 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 was digitally imaged, and then the whole creature was reconstructed using computer graphics. The reconstruction suggests that these exotic animals are indeed related to land spiders, scorpions, mites and ticks, says Briggs.
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, says Briggs. Even in ancient times, he adds, the new species appears to have lived in a similar way to modern ones -- on the seabed or perhaps on sponges.
The research was carried out as part of a project on the Herefordshire fauna by a team that included Briggs, Derek Siveter and Mark Sutton at Oxford University, and David Siveter at the University of Leicester. The group has made a number of other discoveries of soft-bodied organisms in the same deposit including crustaceans, a worm-like mollusc, a polychaete worm, a starfish, and other as-yet-unidentified organisms.
-- By Janet Rettig Emanuel
T H I S
Scientists discover fossil of
ancient sea spider species
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