Abstract
The general shape of test, spine and tubercle morphologies, and ambulacral pore characteristics ofRhabdocidaris nobilis (Munster 1826) andRhabdocidaris reginae n. sp. from the Upper Jurassic are interpreted in functional terms. Results are compared with an independent sedimentological and palaeoecological analysis of the host sediments. The morphological interpretation ofRhabdocidaris nobilis suggests a low energy, possibly partly dysaerobic, firmground setting as is evidenced by (1) the occurrence of slit-like C isopores and (2) tubercles with a broad muscle attachment area indicating strong, motile stalking spines. The morphological interpretation ofRhabdocidaris reginae suggests principally the same mode of life. However, the sedimentological and palaeoecological analysis of the host sediments suggest quite a different environment forRhabdocidaris reginae relative toRhabdocidaris nobilis. This phenomenon can be explained by the physiological characteristics of echinoids.
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