Reconstructing early sponge relationships by using the Burgess Shale fossil Eiffelia globosa, Walcott
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United Kingdom
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Edited by James W. Valentine, University of California, Berkeley, CA (received for review August 10, 2004)
Abstract
The relationships of the sponge classes are controversial, particularly between the calcareous and siliceous sponges. Specimens of the putative calcarean Eiffelia globosa Walcott from the Burgess Shale show the presence of diagnostic hexactinellid spicules integrated into the skeletal mesh. The arrangement of these spicules in Eiffelia is shown to be precisely equivalent to that of early protospongioid hexactinellids, and sponge growth occurred through an identical pattern to produce identical skeletal body morphology. The difference in spicule composition of the classes is interpreted through the observation of taphonomic features of Eiffelia that suggest the presence of at least two mineralogically distinct layers within the spicules. These results support molecular analyses that identify the calcarean-silicisponge transition as the earliest major sponge branch and suggest that the heteractinids were paraphyletic with respect to the Hexactinellida.
Footnotes
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↵ * To whom correspondence should be addressed. E-mail: joseph00{at}esc.cam.ac.uk.
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This paper was submitted directly (Track II) to the PNAS office.
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Abbreviations: HF, hydrofluoric acid; ROM, Royal Ontario Museum; USNM, U.S. National Museum.
- Copyright © 2005, The National Academy of Sciences
