Silurian brachiopods in a stromatoporoid bioherm
Article first published online: 9 OCT 2007
Volume 8, Issue 1, pages 53–61, January 1975
How to Cite
WATKINS, R. (1975), Silurian brachiopods in a stromatoporoid bioherm. Lethaia, 8: 53–61. doi: 10.1111/j.1502-3931.1975.tb00917.x
- Issue published online: 9 OCT 2007
- Article first published online: 9 OCT 2007
- 12th December, 1973.
Ludlovian limestone at Ljugarn, Gotland. repreqents a shallow marine environment of stromatoporoid biohenns and flanking areas of mud and stromatoporoid debris. Brachiopods were restricted to surfaces of the debris deposits. Lissatrypa sulcata, a smooth atrypacean, dominated the brachiopod fauna, with individuals living beak downward in high density clusters, developing weaker pedicle attachment and a sulcus during ontogeny. Surrounding low density areas of Lissatrypa included small, pedicleattached, non-sulcate shells. Howellella, Spirigerina, and Morinorhynchus? lived in isolated clusters near low density Lissatrypa populations, and 10 other very rare brachiopod species may have been non-reproducing members of the community. Brachiopcd species diversity, and thus number of niches, was lower in the biohermal enviroment than in bathymetrically equivalent, level-bottom communities.