Journal
CARNETS DE GEOLOGIE
Volume 16, Issue 27, Pages 633-640Publisher
CARNETS GEOLOGIE
Keywords
microborings; euendoliths; symbiosis; corals; Barremian; Bulgaria
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Funding
- Polish Ministry of Science and Higher Education [2P04D 028 29]
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Euendolithic microorganisms (boring endoliths) syn-vivo associated with modern corals are commonly reported, but their fossil record is extremely rare. This paper reports the new finding recognized in the colonial scleractinian coral Clausastrea saltensis from the Upper Barremian of Bulgaria. Large microborings (up to 50 mu m, most ca. 15-25 mu m in diameter) filled with calcite cement are distributed medially along coral septa of some corallites. Borings were produced by microeuendoliths growing from the skeleton interior outward during the life of the coral host. They are compared to traces produced by the recent oligophotic filamentous chlorophyte Ostreobium, which is known to be the most common skeleton-dwelling alga in modern living corals and regarded as neutral or beneficial to the coral. In terms of general morphology, diameter and distribution pattern, the borings are similar to those recently recognized in the Early Cretaceous microsolenid coral.
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