| Ultrastructure, Taxonomy, and Affinities of Some Ordovician and Silurian Organic Microfossils |
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| The work presents the results of morphological and ultrastructural (TEM and SEM) studies on Ordovician and Silurian organic fossils among which representatives of scyphozoans, hydrozoans, pogonophorans and pterobranchs are recognized. A few forms of uncertain systematic position are also described. SCYPHOZOA: well preserved scyphothecae of Byronia robusta (Kozlowski) are described along with ultrastructural observations made on other Byronia species. Part of the so-called dithecoid graptolites (Dithecoidea) is recognized as colonial scyphoplyps. HYDROZOA: forms described by R. Kozlowski and A. Eisenack as hydroids are revised. The astogenesis of Rhabdohydra tridens Kozlowski is reconstructed. Two new taxa are designated (Rhabdohydra multiplex sp.n., Rhabdohydridae fam.n.). The periderm ultrastructure of five species is described and interpreted. Some forms known as dithecoid graptolites, Chaunograptus and the Chaunograptidae are recognized as colonial hydropolyps. POGONOPHORA: Beklemishevites grandis gen. et sp. n. is desribed. Tube ultrastructure is studied for two species revealing in one case the presence of a chitin-protein complex. PTEROBRANCHIA: forms desrcibed by R. Kozlowski are revised and a new taxonomy is proposed for the Rhabdopleurida. Some forms classified previously as hydroids are identified as rhabdopleurids and four new taxa are designated (Kystodendron complicatus sp.n., Kystodendron tener sp.n., Rhabdopleuroididae fam.n., and Rhabdopleuritidae fam.n.). The astogenesis of Rhabdopleurites primaevus Kozlowski is reconstructed and new types of stolonal tubes (without zig-zag suture and fuselli) are described. The ultrastructure of cysts, stolons and stolonal tubes is studied in several forms. A congenerity of Rhabdopleurites with some forms described previously as tuboid (Tuboidea) or stoonoid (Stolonoidea) graptolites and hydroids is suggested. MISCELLANEA: ultrastructure of five problematic microfossils are studied. A few new taxa are described including two new genera. CONTENTS Introduction Acknowledgements Material Methods Chemical methods Electron microscopy Systematic part Scyphozoa Dithecoidea - primitive graptolites or colonial scyphopolyps? Genus Byronia Matthew, 1899 Byronia naumovi Kozlowski, 1967 Byronia robusta (Kozlowski, 1967) Byronia sp. A Hydrozoa Some remarks on the Hydroida skeleton Family Rhabdohydridae Mierzejewski, 1986 Genus Rhabdohydra Kozlowski, 1959 Rhabdohydra tridens Kozlowski, 1959 Rhabdohydra multiplex Mierzejewski, 1986 ?Rhabdohydra sp. Genus Palaeotuba Eisenack, 1934 Palaeotuba polycephala Eisenack, 1934 Family Chaunograptidae Bulman, 1955 Genus Chaunograptus Hall, 1882 [related page here ] Chaunograptus flexuosus (Kozlowski, 1959) Mierzejewski, 1986 Chaunograptus adhaerens (Kozlowski, 1959) Mierzejewski, 1986 ?Chaunograptus sp. Family Inocaulidae Rudemann, 1947 Genus Inocaulis Hall, 1852 Inocaulis sp. Incertae familiae Genus Calyxhydra Koz這wski, 1959 Genus Flexihydra Koz這wski, 1959 Flexidydra undulata Koz這wski, 1959 Pogonophora Genus Sokolovites Koz這wski, 1967 Sokolovites pogonophoroides Koz這wski, 1967 [related page here] Genus Beklemishevites Mierzejewski, 1986 Beklemishevites grandis Mierzejewski, 1986 Pterobranchia The structure of the Rhabdopleurida coenecium Remarks on the systematics ot the Rhabdopleurida Stolonoidea - graptolites or pterobranchs? Family Rhadopleuroididae Mierzejewski, 1986 Genus Rhabdopleuroides Koz這wski, 1961 Rhadopleuroides expectatus Koz這wski, 1961 Family Rhabdopleuritidae Mierzejewski, 1986 Genus Rhabdopleurites Koz這wski, 1967 Rhabdopleurites primaevus Koz這wski, 1967 ?Rhabdopleurites sp. Family Rhadopleuridae Harmer, 1905 Genus Kystodendron Koz這wski, 1959 Kystodendron longicarpus (Eisenack, 1937), sensu Koz這wski, 1959 Kystodendron ex gr. longicarpus (Eisenack) sensu Koz這wski Kystodendron subtilis (Koz這wski, 1959) Mierzejewski, 1986 Kystodendron cf. subtilis (Koz這wski, 1959) Mierzejewski, 1986 Kystodendron aff. subtilis (Koz這wski, 1959) Kystodendron complicatus Mierzejewski, 1986 Kystodendron tener Mierzejewski, 1986 ?Kystodendron sp. A ?Kystodendron sp. B Incertae sedis (Pterobranchia?) Genus Lagenohydra Koz這wski, 1959 Lagenohydra phragmata Koz這wski, 1959 Miscellanea Genus Ascosyrinx Kozlowski, 1967 Ascosyrinx tenuis Kozlowski, 1967 Genus Chitinodendron Eisenack, 1937 Chitinodendron bacciferum Eisenack, 1937 Genus Diplohydra Kozlowski, 1959 [related page here] Genus Eisenackisyrinx Mierzejewski, 1986 Eisenackisyrinx curvatus Mierzejewski, 1986 Genus Kozlowskisyrinx Mierzejewski, 1986 Kozlowskisyrinx graptovermiformis Mierzejewski, 1986 Genus Phragmohydra Kozlowski, 1959 Phragmohydra articulata Kozlowski, 1959 Genus Xenohydra Kozlowski, 1959 Xenohydra labiata Kozlowski, 1959 Genus Xenotheka Eisenack, 1937 Xenotheka klinostoma Eisenack, 1937 Problematicum A Problematicum B Problematicum C Problematicum D |
| Palaeontologia Polonica 47, 129-220. |
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