Constructional Morphology of Pelagic Crinoids

Other| February 01, 2004 Constructional Morphology of Pelagic Crinoids ADOLF SEILACHER; ADOLF SEILACHER 1Universität Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germany, and Geology & Geophysics Department, Yale University, P.O. Box 208109, New Haven, CT, 06520-8109, geodolf@tuebingen.netsurf.de Search for other works by this author on: GSW Google Scholar ROLF B. HAUFF ROLF B. HAUFF 2Urwelt-Museum Hauff, Aichelberger Strasse 90, 73271 Holzmaden/Teck, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information ADOLF SEILACHER 1Universität Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germany, and Geology & Geophysics Department, Yale University, P.O. Box 208109, New Haven, CT, 06520-8109, geodolf@tuebingen.netsurf.de ROLF B. HAUFF 2Urwelt-Museum Hauff, Aichelberger Strasse 90, 73271 Holzmaden/Teck, Germany Publisher: SEPM Society for Sedimentary Geology Accepted: 15 Sep 2003 First Online: 03 Mar 2017 Online ISSN: 1938-5323 Print ISSN: 0883-1351 Society for Sedimentary Geology PALAIOS (2004) 19 (1): 3–16. https://doi.org/10.1669/0883-1351(2004)019<0003:CMOPC>2.0.CO;2 Article history Accepted: 15 Sep 2003 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation ADOLF SEILACHER, ROLF B. HAUFF; Constructional Morphology of Pelagic Crinoids. PALAIOS 2004;; 19 (1): 3–16. doi: https://doi.org/10.1669/0883-1351(2004)019<0003:CMOPC>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyPALAIOS Search Advanced Search Abstract While all modern crinoids are benthic filter feeders, some fossil species found in low-oxygen Konservat-Lagerstätten probably were pelagic. Pseudoplanktonic forms were mostly attached to driftwood (Seirocrinus, Traumatocrinus, Melocrinus); they had long, rope-like stems and enlarged, permanently splayed filter fans, as required for a passive tow-net function. However, the short and heavily cirrated stem of another driftwood-dweller (Pentacrinites) suggests active filter feeding. If the buoyant lobolith of Scyphocrinites acted as a swim bladder, this crinoid, by the same tow-net principle, could have made use of velocity gradients near a boundary layer. Paradigms are different for stemless forms, whether they floated passively over the bottom (Uintacrinus) or filtrated actively in the water column (Roveacrinids and Saccocoma). Some of the proposed models could not function with the muscular and ligamentary system of modern forms. Nevertheless, they represent distinctive peaks in the adaptive landscape that can be tested using taphonomic, morphological, and evolutionary evidence. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.