Abstract
AbstractScorpions are among the first animals to have become fully terrestrialised. Their early fossil record is limited, and fundamental questions, including how and when they adapted to life on land, have been difficult to answer. Here we describe a new exceptionally preserved fossil scorpion from the Waukesha Biota (early Silurian, ca. 437.5–436.5 Ma) of Wisconsin, USA. This is the earliest scorpion yet reported, and it shows a combination of primitive marine chelicerate and derived arachnid characteristics. Elements of the circulatory, respiratory, and digestive systems are preserved, and they are essentially indistinguishable from those of present-day scorpions but share similarities with marine relatives. At this early point in arachnid evolution, physiological changes concomitant with the marine-to-terrestrial transition must have occurred but, remarkably, structural change in the circulatory or respiratory systems appear negligible. Whereas there is no unambiguous evidence that this early scorpion was terrestrial, this evidence suggests that ancestral scorpions were likely capable of forays onto land, a behavior similar to that of extant horseshoe crabs.
Publisher
Springer Science and Business Media LLC
Reference36 articles.
1. Dunlop, J. A., Scholtz, G. & Selden, P. A. Water-to-land transitions in Arthropod Biology and Evolution. (eds. Minelli, A., Boxshall, G. & Fusco, G. 417–439 (Springer, 2013).
2. Dunlop, J. A. & Webster, M. Fossil evidence, terrestrialization and arachnid phylogeny. J. Arachn. 27, 86–93 (1999).
3. Selden, P. A. & Dunlop, J. A. Fossil taxa and relationships of chelicerates in Arthropod Fossils and Phylogeny. (ed, Edgecombe, G. D.) 303–332 (Columbia University Press, 1998).
4. Anderson, L. I., Clarkson, E. N. K., Steward, S. E. & Mitchell, D. An upper Llandovery Konservat-Lagerstätte in a depositional context: the Pentland Hills Eurypterid Bed, Midlothian. Scot. J. Geol. 43, 41–50 (2007).
5. Jeram, A. J. Phylogeny, classification and evolution of Silurian and Devonian scorpions. Proc. 17th Eur. Colloq. Arachn. Edinb. 1997, 17–31 (1998).
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