Baumeister, J. G. 1999. Vergleich der Funktionsmorphologie und Paläoökologie zweier Rhabocidariden (Echinodermata: Cidaridae). Paläontologische Zeitschrift 73, 319-326.

175814

Baumeister, J. G.

1999

73: 319-326

Publication

The general shape of test, spine and tubercle morphologies, and ambulacral pore characteristics of Rhabdocidaris nobilis (Münster 1826) and Rhabdocidaris 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 of Rhabdocidaris 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 of Rhabdocidaris reginae suggests principally the same mode of life. However, the sedimentological and palaeoecological analysis of the host sediments suggest quite a different environment for Rhabdocidaris reginae relative to Rhabdocidaris nobilis. This phenomenon can be explained by the physiological characteristics of echinoids.Die all

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