DESMOGRAPTUS MICRONEMATODES, A SILURIAN DENDROID GRAPTOLITE, AND ITS ULTRASTRUCTURE
: Desmograptus micronematodes from Thornton quarry, Cook County, Illinois, USA, remarkably preserved in relief and encased in pyrite, is described. The internal details of the thecae, and of the stolon system, examined using the SEM, allow the reconstruction of the growth of a stipe. The stolons a...
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| Veröffentlicht in: | Palaeontology 2009-05, Vol.52 (3), p.541-559 |
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| container_title | Palaeontology |
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| creator | SAUNDERS, KATE M. BATES, DENIS E. B. KLUESSENDORF, JOANNE LOYDELL, DAVID K. MIKULIC, DONALD G. |
| description | : Desmograptus micronematodes from Thornton quarry, Cook County, Illinois, USA, remarkably preserved in relief and encased in pyrite, is described. The internal details of the thecae, and of the stolon system, examined using the SEM, allow the reconstruction of the growth of a stipe. The stolons and stolonal nodes are formed of a dense crassal fabric, and are surrounded by a loose fabric of three‐dimensional fibrils. The nodes have a complex structure of three boxes with proximal and distal nozzles. The base of a bitheca, and the base of each autothecal cup, has a central nozzle surrounded by a unique honeycomb fabric. The ultrastructure of the cortical fibrils, with their clockwise striations, is similar to that in Dendrograptus, and may be universal in the graptolites. The nodes of the stolon system appear identical to those of Acanthograptus and other dendroids, but differ from those of the extant hemichordate Rhabdopleura, which have only a diaphragm, and lack box structures. |
| doi_str_mv | 10.1111/j.1475-4983.2009.00859.x |
| format | Article |
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The ultrastructure of the cortical fibrils, with their clockwise striations, is similar to that in Dendrograptus, and may be universal in the graptolites. 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The ultrastructure of the cortical fibrils, with their clockwise striations, is similar to that in Dendrograptus, and may be universal in the graptolites. The nodes of the stolon system appear identical to those of Acanthograptus and other dendroids, but differ from those of the extant hemichordate Rhabdopleura, which have only a diaphragm, and lack box structures.</description><subject>Anatomy & physiology</subject><subject>autotheca</subject><subject>bitheca</subject><subject>dendroid graptolite</subject><subject>Desmograptus</subject><subject>Fossils</subject><subject>Nematodes</subject><subject>Paleontology</subject><subject>Quarries</subject><subject>stolon</subject><subject>ultrastructure</subject><issn>0031-0239</issn><issn>1475-4983</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNqNkM1Og0AUhSdGE2v1HSauBeeHoczCxaRgJaHQwLCeDDCTlFRbwcb2bXwWn0xojWvv5t7knHNP8gEAMXLxMI-ti70ZczweUJcgxF2EAsbdwwWY_AmXYIIQxQ4ilF-Dm75vEUKEcX8CyjAqltkiFytZFvD7axnP8yyNlkJmg_IABSzipMxjkcIwSsM8i0N4cmdJLKNBT0MYywKWicxFIfNyLss8ugVXVm96c_e7p6B8juT8xUmyRTwXiVNTD3HHo6ZpmorUWjNvVrGG-9jHNNC-4bVh2Nak0cbSyla01tazQcMwr2c2oLUhTNMpuD__3XXb973pP1S73XdvQ6UimCBG_cAbTMHZVHfbvu-MVbtu_aq7o8JIjQxVq0ZUakSlRobqxFAdhujTOfq53pjjv3NqJRIxXPQHStNyUg</recordid><startdate>200905</startdate><enddate>200905</enddate><creator>SAUNDERS, KATE M.</creator><creator>BATES, DENIS E. B.</creator><creator>KLUESSENDORF, JOANNE</creator><creator>LOYDELL, DAVID K.</creator><creator>MIKULIC, DONALD G.</creator><general>Blackwell Publishing Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>F1W</scope><scope>H95</scope><scope>L.G</scope></search><sort><creationdate>200905</creationdate><title>DESMOGRAPTUS MICRONEMATODES, A SILURIAN DENDROID GRAPTOLITE, AND ITS ULTRASTRUCTURE</title><author>SAUNDERS, KATE M. ; BATES, DENIS E. 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B.</creatorcontrib><creatorcontrib>KLUESSENDORF, JOANNE</creatorcontrib><creatorcontrib>LOYDELL, DAVID K.</creatorcontrib><creatorcontrib>MIKULIC, DONALD G.</creatorcontrib><collection>CrossRef</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Palaeontology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>SAUNDERS, KATE M.</au><au>BATES, DENIS E. B.</au><au>KLUESSENDORF, JOANNE</au><au>LOYDELL, DAVID K.</au><au>MIKULIC, DONALD G.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>DESMOGRAPTUS MICRONEMATODES, A SILURIAN DENDROID GRAPTOLITE, AND ITS ULTRASTRUCTURE</atitle><jtitle>Palaeontology</jtitle><date>2009-05</date><risdate>2009</risdate><volume>52</volume><issue>3</issue><spage>541</spage><epage>559</epage><pages>541-559</pages><issn>0031-0239</issn><eissn>1475-4983</eissn><abstract>: Desmograptus micronematodes from Thornton quarry, Cook County, Illinois, USA, remarkably preserved in relief and encased in pyrite, is described. The internal details of the thecae, and of the stolon system, examined using the SEM, allow the reconstruction of the growth of a stipe. The stolons and stolonal nodes are formed of a dense crassal fabric, and are surrounded by a loose fabric of three‐dimensional fibrils. The nodes have a complex structure of three boxes with proximal and distal nozzles. 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| ispartof | Palaeontology, 2009-05, Vol.52 (3), p.541-559 |
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| source | Wiley Free Content; Wiley Online Library Journals Frontfile Complete; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | Anatomy & physiology autotheca bitheca dendroid graptolite Desmograptus Fossils Nematodes Paleontology Quarries stolon ultrastructure |
| title | DESMOGRAPTUS MICRONEMATODES, A SILURIAN DENDROID GRAPTOLITE, AND ITS ULTRASTRUCTURE |
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