eesti teaduste
akadeemia kirjastus
SINCE 1952
Earth Science cover
Estonian Journal of Earth Sciences
ISSN 1736-7557 (Electronic)
ISSN 1736-4728 (Print)
Impact Factor (2021): 0.811
The earliest cornulitid on the internal surface of the illaenid pygidium from the Middle Ordovician of Estonia; pp. 193–197

Olev Vinn, Ursula Toom, Mare Isakar

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.


Bassler, R. S. 1911. The early Paleozoic Bryozoa of the Baltic provinces. Bulletin of US National Museum, 77, 1–382.

Brandt, D. S. 1996 Epizoans on Flexicalymene (Trilobita) and implications for trilobite paleoecology. Journal of Paleonotology, 70, 442–449.

Cocks, L. R. M. & Torsvik, T. H. 2005. Baltica from the late Precambrian to mid-Palaeozoic times: the gain and loss of a terranes identity. Earth Science Reviews, 72, 39–66.

Goryunova, R. V. 1992. Morphology and system of the Palezoic bryozoans. Trudy Paleontologicheskogo Instituta, 251, 1–152 [in Russian].

Goryunova, R. V. 1996. Phylogeny of the Paleozoic bryozoans. Trudy Paleontologicheskogo Instituta, 267, 1–163 [in Russian].

Goryunova, R. V. & Lavrenteva, V. D. 1993. Morphology and system of the cryptostome bryozoans. Trudy Paleontologicheskogo Instituta, 257, 1–151 [in Russian].

Lavrenteva, V. D. 1990. New genus of cryptostomate bryozoans. Paleontologicheskij Zhurnal, 2, 127–130 [in Russian].

Männil, R. 1959. Problems of the Stratigraphy and Bryozoans from the Ordovician of Estonia. Candidate of Sciences Thesis. Institute of Geology. Academy of Sciences of the ESSR, Tallinn, 542 pp. [in Russian].

Männil, R. 1961. On the morphology of the hemisphaeric zoaria of Trepostomata (Bryozoa). ENSV Teaduste Akadeemia Geoloogia Instituudi uurimused, VI, 113–140 [in Russian].

Modzalevskaya, E. A. 1953. Ordovician Treptostomata from Baltics and their significance in stratigraphy. Trudy VNIGRI, Stratigrafiya i Fauna Ordovika i Silura Zapada Russkoj Platformy, 78, 91–167 [in Russian].

Morris, R. W. & Rollins, H. B. 1971. The distribution and paleoecological interpretation of Cornulites in the Waynesville Formation (Upper Ordovician) of south­western Ohio. Ohio Journal of Science, 71, 159–179.

Nestor, H. & Einasto, R. 1997. Ordovician and Silurian carbonate sedimentation basin. In Geology and Mineral Resources of Estonia (Raukas, A. & Teedumäe, A., eds), pp. 192–204. Estonian Academy Publishers, Tallinn.

Öpik, A. 1930. Beiträge zur kenntnis der Kukruse-(C2-C3-) Stufe in Eesti. Publications of the Geological Institution of the University of Tartu, 24, 8–10.

Pushkin, V. I. & Gataulina, G. M. 1992. A revision of the Early Palaeozoic bryozoan of the order Cystoporida
from E. Eichwald’s collection. Voprosy Paleontologii, 10, 88–97.

Schumann, D. 1967. Die Lebensweise von Mucrospirifer Grabau, 1931 (Brachiopoda). Palaeogeography, Palaeo­climatology, Palaeoecology, 3, 381–392.

Taylor, P. D. & Wilson, M. A. 2003. Palaeoecology and evolution of marine hard substrate communities. Earth Science Reviews, 62, 1–103.

Taylor, P. D., Vinn, O. & Wilson, M. A. 2010. Evolution of biomineralization in “lophophorates”. Special Papers in Palaeontology, 84, 317–333.

Tetreault, D. K. 1992. Paleoecologic implications of epibionts on the Silurian lichid trilobite Arctinurus. In Fifth North American Paleontological Convention, Abstracts and Program, Paleontological Society Special Publication, 6, 289.

Torsvik, T. H., Cocks, L. R. M. & Harper, D. A. T. 2013. New global palaeogeographical reconstructions for the Early Palaeozoic and their generation. In Early Palaeozoic Biogeography and Palaeogeography (Servais, T., ed.), Geological Society Memoirs, 38, 5–24.

Vinn, O. 2013. Cornulitid tubeworms from the Ordovician of eastern Baltic. Carnets de Géologie, CG2013_L03.

Vinn, O. & Mutvei, H. 2009. Calcareous tubeworms of the Phanerozoic. Estonian Journal of Earth Sciences, 58, 286–296.

Vinn, O. & Toom, U. 2015. Some encrusted hardgrounds from the Ordovician of Estonia (Baltica). Carnets de Géologie, 15, 63–70.

Vinn, O. & Zatoń, M. 2012. Phenetic phylogenetics of tentaculitoids – extinct problematic calcareous tube-forming organisms. GFF, 134, 145–156.

Wilson, M. A. 1985. Disturbance and ecologic succession in an Upper Ordovician cobble-dwelling hardground fauna. Science, 228, 575–577.

Whittington, H. B. 1992. Trilobites. Boydell Press, Woodbridge, 145 pp.

Back to Issue