A new bioclaustration of a symbiont is here described from the mantle cavity of the strophomenata... more A new bioclaustration of a symbiont is here described from the mantle cavity of the strophomenatan brachiopod Clitambonites schmidti. It is the second bioclaustration in brachiopods known from the Kukruse Regional Stage (Sandbian) of Estonia. It shares affinities with the bioclaustrations Burrinjuckia and Haplorygma. The outgrowth in the ventral valve interior was secreted by the brachiopod around a symbiont. Most likely the symbiont was a suspension feeder that collected food particles from the brachiopod's mantle cavity. The symbiont was either a kleptoparasite or fed on the brachiopod's feces (coprophagy). The majority of symbiosis cases in brachiopods in the Ordovician of Baltica involve clitambonitids as the hosts. Thus, clitambonitid brachiopods were more likely hosts for symbiosis than other brachiopods in the Ordovician of Baltica.
Page 26. 27 WOGOGOB-2004 CONFERENCE MATERIALS A recent evaluation of gastropod diversity dynam-ic... more Page 26. 27 WOGOGOB-2004 CONFERENCE MATERIALS A recent evaluation of gastropod diversity dynam-ics during the Great Ordovician Biodiversification event in five palaeocontinents has presented an interesting pattern for Baltica (Novack-Gottshall & Miller 2003). ...
Multiple calcareous worm-like boring casts occur on the inner surface of the calcitic external la... more Multiple calcareous worm-like boring casts occur on the inner surface of the calcitic external layer of the bivalve Leptodesma sp. from the Kaugatuma Formation (lower Přídolí, Upper Silurian) of Saaremaa Island, Estonia. Most of the boring casts are oriented with their apertures towards the posterior margin of Leptodesma sp. The worm-like casts were originally borings in the aragonitic layer of the valve. The borings were filled with sediment and the aragonitic layer of the bivalve later dissolved. The orientation of the borings indicates that they were likely made during the life of Leptodesma . The boring worms likely used the feeding currents of the bivalve to capture suspended nutrients, so they may have been kleptoparasites. Based on the morphology of borings in Leptodesma, they likely housed some type of filter-feeding polychaete annelid.
Rare Oichnus simplex drill holes occur in mature obolid shells from the Cambrian/Ordovician bound... more Rare Oichnus simplex drill holes occur in mature obolid shells from the Cambrian/Ordovician boundary beds of northern Estonia (Iru and Ulgase) and the uppermost Cambrian of NW Russia (Lava River). ...
Abstract. A new sinistrally coiled univalved mollusk Catalanispira n. gen. is described with two ... more Abstract. A new sinistrally coiled univalved mollusk Catalanispira n. gen. is described with two species; Catalanispira reinwaldti (Öpik, 1930) from the Middle Ordovician Kõgekallas Formation (Darriwilian) of Estonia and Catalanispira plattevillensis n. gen. n. sp. from the Upper Ordovician Platteville Formation (Sandbian) of northern Illinois, USA. Morphological features include a large, low-trochiform shell, a narrow lenticular aperture, a deep funnel-like umbilicus, a falcate inner lip and a large (1.4 mm wide) protoconch. Ornamentation consists of fine commarginal growth lines or ribs but superimposed on a slightly irregular shell surface. Catalanispira n. gen. is placed within the sinistrally coiled order Mimospirida and the family Onychochilidae, and Catalanispirinae n. subfam. is proposed. The large Lower Ordovician (Tremadocian) Pelecyogyra Ebbestad and Lefebvre, 2015 from Morocco and France is transferred to this new subfamily. The well-preserved initial growth stage of Cat...
The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of E... more The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of Estonia. Internal annulation is present in all Middle Ordovician cornulitids and could be a plesiomorphic character for the group. The encrusted trilobites are rare in the Ordovician of Estonia. Illaenid pygidia and cranidia were encrusted by cornulitids and trepostome bryozoans. The encrustation of both Middle Ordovician and Late Ordovician trilobites took place post mortem. The studied hard substrate communities of Middle Ordovician and Late Ordovician trilobite pygidia and cranidia are typical of the Ordovician.
Studying deep time biodiversity and environments is largely based on collections of fossils and s... more Studying deep time biodiversity and environments is largely based on collections of fossils and sedimentary rocks, and the information acquired thereof. The sedimentary bedrocks of Estonia and neighbouring areas constitute a well-preserved archive of Earth history from the late Precambrian to the Devonian period. This interval of geological time hosts several key events in the diversification of life, notably the Cambrian explosion, the Great Ordovician Biodiversification Event and the Hirnantian mass extinction. Documenting and understanding these events has benefited from the geological and paleontological collections from the Baltic region, a large part of which are deposited in Estonia. Since 2004 Estonia has had a 'national geological collection' that virtually joins the archives of three major collection-holding institutions: Tallinn University of Technology, University of Tartu and the Estonian Museum of Natural History (Hints et al. 2008). A key to the functioning of...
Discosorid and oncocerid cephalopods of the Kunda and Aseri Regional Stage (Darriwilian, Middle O... more Discosorid and oncocerid cephalopods of the Kunda and Aseri Regional Stage (Darriwilian, Middle Ordovician) from Öland Island, Sweden and North Estonia are described for the first time. We demonstrate that a high generic and specific diversity of Oncocerida was already established in the earliest Darriwilian. The new oncocerid species Neumatoceras borense nov. sp., N. breviborense nov. sp., Paramiamoceras breviventrum nov.
Page 26. 27 WOGOGOB-2004 CONFERENCE MATERIALS A recent evaluation of gastropod diversity dynam-ic... more Page 26. 27 WOGOGOB-2004 CONFERENCE MATERIALS A recent evaluation of gastropod diversity dynam-ics during the Great Ordovician Biodiversification event in five palaeocontinents has presented an interesting pattern for Baltica (Novack-Gottshall & Miller 2003). ...
The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of E... more The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of Estonia. Internal annulation is present in all Middle Ordovician cornulitids and could be a plesiomorphic character for the group. The encrusted trilobites are rare in the Ordovician of Estonia. Illaenid pygidia and cranidia were encrusted by cornulitids and trepostome bryozoans. The encrustation of both Middle Ordovician and Late Ordovician trilobites took place post mortem. The studied hard substrate communities of Middle Ordovician and Late Ordovician trilobite pygidia and cranidia are typical of the Ordovician.
A new bioclaustration of a symbiont is here described from the mantle cavity of the strophomenata... more A new bioclaustration of a symbiont is here described from the mantle cavity of the strophomenatan brachiopod Clitambonites schmidti. It is the second bioclaustration in brachiopods known from the Kukruse Regional Stage (Sandbian) of Estonia. It shares affinities with the bioclaustrations Burrinjuckia and Haplorygma. The outgrowth in the ventral valve interior was secreted by the brachiopod around a symbiont. Most likely the symbiont was a suspension feeder that collected food particles from the brachiopod's mantle cavity. The symbiont was either a kleptoparasite or fed on the brachiopod's feces (coprophagy). The majority of symbiosis cases in brachiopods in the Ordovician of Baltica involve clitambonitids as the hosts. Thus, clitambonitid brachiopods were more likely hosts for symbiosis than other brachiopods in the Ordovician of Baltica.
Page 26. 27 WOGOGOB-2004 CONFERENCE MATERIALS A recent evaluation of gastropod diversity dynam-ic... more Page 26. 27 WOGOGOB-2004 CONFERENCE MATERIALS A recent evaluation of gastropod diversity dynam-ics during the Great Ordovician Biodiversification event in five palaeocontinents has presented an interesting pattern for Baltica (Novack-Gottshall & Miller 2003). ...
Multiple calcareous worm-like boring casts occur on the inner surface of the calcitic external la... more Multiple calcareous worm-like boring casts occur on the inner surface of the calcitic external layer of the bivalve Leptodesma sp. from the Kaugatuma Formation (lower Přídolí, Upper Silurian) of Saaremaa Island, Estonia. Most of the boring casts are oriented with their apertures towards the posterior margin of Leptodesma sp. The worm-like casts were originally borings in the aragonitic layer of the valve. The borings were filled with sediment and the aragonitic layer of the bivalve later dissolved. The orientation of the borings indicates that they were likely made during the life of Leptodesma . The boring worms likely used the feeding currents of the bivalve to capture suspended nutrients, so they may have been kleptoparasites. Based on the morphology of borings in Leptodesma, they likely housed some type of filter-feeding polychaete annelid.
Rare Oichnus simplex drill holes occur in mature obolid shells from the Cambrian/Ordovician bound... more Rare Oichnus simplex drill holes occur in mature obolid shells from the Cambrian/Ordovician boundary beds of northern Estonia (Iru and Ulgase) and the uppermost Cambrian of NW Russia (Lava River). ...
Abstract. A new sinistrally coiled univalved mollusk Catalanispira n. gen. is described with two ... more Abstract. A new sinistrally coiled univalved mollusk Catalanispira n. gen. is described with two species; Catalanispira reinwaldti (Öpik, 1930) from the Middle Ordovician Kõgekallas Formation (Darriwilian) of Estonia and Catalanispira plattevillensis n. gen. n. sp. from the Upper Ordovician Platteville Formation (Sandbian) of northern Illinois, USA. Morphological features include a large, low-trochiform shell, a narrow lenticular aperture, a deep funnel-like umbilicus, a falcate inner lip and a large (1.4 mm wide) protoconch. Ornamentation consists of fine commarginal growth lines or ribs but superimposed on a slightly irregular shell surface. Catalanispira n. gen. is placed within the sinistrally coiled order Mimospirida and the family Onychochilidae, and Catalanispirinae n. subfam. is proposed. The large Lower Ordovician (Tremadocian) Pelecyogyra Ebbestad and Lefebvre, 2015 from Morocco and France is transferred to this new subfamily. The well-preserved initial growth stage of Cat...
The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of E... more The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of Estonia. Internal annulation is present in all Middle Ordovician cornulitids and could be a plesiomorphic character for the group. The encrusted trilobites are rare in the Ordovician of Estonia. Illaenid pygidia and cranidia were encrusted by cornulitids and trepostome bryozoans. The encrustation of both Middle Ordovician and Late Ordovician trilobites took place post mortem. The studied hard substrate communities of Middle Ordovician and Late Ordovician trilobite pygidia and cranidia are typical of the Ordovician.
Studying deep time biodiversity and environments is largely based on collections of fossils and s... more Studying deep time biodiversity and environments is largely based on collections of fossils and sedimentary rocks, and the information acquired thereof. The sedimentary bedrocks of Estonia and neighbouring areas constitute a well-preserved archive of Earth history from the late Precambrian to the Devonian period. This interval of geological time hosts several key events in the diversification of life, notably the Cambrian explosion, the Great Ordovician Biodiversification Event and the Hirnantian mass extinction. Documenting and understanding these events has benefited from the geological and paleontological collections from the Baltic region, a large part of which are deposited in Estonia. Since 2004 Estonia has had a 'national geological collection' that virtually joins the archives of three major collection-holding institutions: Tallinn University of Technology, University of Tartu and the Estonian Museum of Natural History (Hints et al. 2008). A key to the functioning of...
Discosorid and oncocerid cephalopods of the Kunda and Aseri Regional Stage (Darriwilian, Middle O... more Discosorid and oncocerid cephalopods of the Kunda and Aseri Regional Stage (Darriwilian, Middle Ordovician) from Öland Island, Sweden and North Estonia are described for the first time. We demonstrate that a high generic and specific diversity of Oncocerida was already established in the earliest Darriwilian. The new oncocerid species Neumatoceras borense nov. sp., N. breviborense nov. sp., Paramiamoceras breviventrum nov.
Page 26. 27 WOGOGOB-2004 CONFERENCE MATERIALS A recent evaluation of gastropod diversity dynam-ic... more Page 26. 27 WOGOGOB-2004 CONFERENCE MATERIALS A recent evaluation of gastropod diversity dynam-ics during the Great Ordovician Biodiversification event in five palaeocontinents has presented an interesting pattern for Baltica (Novack-Gottshall & Miller 2003). ...
The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of E... more The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of Estonia. Internal annulation is present in all Middle Ordovician cornulitids and could be a plesiomorphic character for the group. The encrusted trilobites are rare in the Ordovician of Estonia. Illaenid pygidia and cranidia were encrusted by cornulitids and trepostome bryozoans. The encrustation of both Middle Ordovician and Late Ordovician trilobites took place post mortem. The studied hard substrate communities of Middle Ordovician and Late Ordovician trilobite pygidia and cranidia are typical of the Ordovician.
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