First record of a receptaculitid algae (Receptaculitaceae) in Ukraine

[Гриценко, В, Руденко К., Коваленко, О. Перша знахідка рецептакулітиди (Receptaculitaceae) в Україні]

Volodymyr Grytsenko, http://orcid.org/0000-0003-2904-4851

Kseniia Rudenko, https://orcid.org/0000-0002-9353-193X

Oleksii Kovalenko, https://orcid.org/0000-0001-6405-2035

National Museum of Natural History of the National Academy of Sciences of Ukraine (Kyiv, Ukraine)

Cite as

Grytsenko, V., Rudenko, K., Kovalenko. O. (2026). First record of a receptaculitid algae (Receptaculitaceae) in Ukraine. GEO&BIO, 28, 17-26.

doi: https://doi.org/10.53452/gb2803

pdf: G&B №28-2026_17-26_Grytsenko.pdf

Abstract

Most exposures of the Upper Ordovician Subich Formation of western Ukraine are submerged beneath the Dniester Hydroelectric Power Station reservoir, complicating field studies. Nevertheless, several outcrops remain above the water level and provide valuable information on the biota of Late Ordovician ecosystems. Fossils of corals, crinoids, stromatoporoids, bryozoans, brachiopods, cephalopods, bivalves, gastropods, and other faunistic groups have been reported from the Subich Formation; however, no information regarding calcareous algae of the order Dasycladales from these deposits was previously available. We studied a sample of gray clayey-detrital limestone containing remains of an unknown organism, collected by Leonid Ivanovych Konstantynenko from the Subich Formation of the Molodove Horizon on the left bank of Studenytsia Bay of the Dniester Reservoir. Although the fossil was initially interpreted as a coral, detailed analysis revealed a thin (~5 mm) plate composed of rhomboidal cross-section elements (prisms) arranged in a spiral pattern resembling a sunflower inflorescence. These morphological features correspond to the species Receptaculites occidentalis, a member of a problematic group of fossil organisms found in deposits from the Ordovician to the Permian across multiple continents. Historically, these organisms were considered problematic, and their systematic position remains debated. While similar specimens were previously interpreted as corals, a specific type of sponge, or bryozoans, modern studies of their microstructure have clarified their classification as calcareous algae of the order Dasycladales. We report Receptaculites occidentalis from the Ordovician of Ukraine for the first time. This study provides a detailed description of the fossil, includes photographs, and presents a comparison with receptaculitid specimens from the National Museum of Natural History Museum of the NAS of Ukraine, collected from Silurian deposits of the Barrandian region (Czech Republic). These findings enhance our understanding of the palaeontological diversity of the Subich Formation and provide insights into the palaeogeography and environmental characteristics of Late Ordovician marine basins.

Key words

Upper Ordovician, Receptaculites, living conditions, Dasycladales, calcareous algae, Podillia

Correspondence to: Volodymyr Grytsenko; National Museum of Natural History of the National Academy of Sciences of Ukraine, 15 Bohdana Khmelnytskoho Street, Kyiv 01054, Ukraine; e-mail: favosites@ukr.net

Article info

Submitted: 07.05.2024. Revised: 31.10.2025. Accepted: 27.02.2026

References

Alberstadt, L. P., & Walker K. R. (1976). A receptaculitid-echinoderm pioneer community in a Middle Ordovician reef. Lethaia, 9, 261–272. https://doi.org/10.1111/j.1502-3931.1976.tb01319.x

Anfimova, G., & Grytsenko, V. (2023). Ordovician collections at the National Museum of Natural History NAS of Ukraine. Estonian Journal of Earth Sciences, 72(1), 10–13. https://doi.org/10.3176/earth.2023.60

Beadle, S. S. C. (1988). Dasyclads, cyclocrinitids, and receptaculitids: comparative morphology and paleoecology. Lethaia, 2(1), 1–12. https://doi.org/10.1111/j.1502-3931.1988.tb01745.x

Billings, E. (1865). Palaeozoic Fossils. Geological Survey of Canada. Dawson Brothers, Montreal, 1, 1–426.

Byrnes, J. G. (1968). Notes on the nature and environmental significance of the Receptaculitaceae. Lethaia, 1, 368–381. https://doi.org/10.1111/j.1502-3931.1968.tb01627.x

Dames, W. (1868). Uber die in der Umgebung Freiburgs in Nieder-Silesien auftreten den devonischen Ablagerungen. Zeitschrift der Deutschen Geologishen Gesellschaft, 20(3), 469–508.

Eichwald, E. (1860). Lethaea Rossica. Stuttgart. https://doi.org/10.5962/bhl.title.52391

Finney, S. C., Fisher, D. C., Nitecki, M. H. (1994). Morphology and merom gradients in the Ordovician receptaculitid Fisherites reticulatus. Acta Palaeontologica Polonica, 38(3/4), 233–272.

Fisher, D. C., & Nitecki, M. H. (1982). Standardisation of the Anatomical Orientation of Receptaculitids. Memoir (The Palaeontological Society), published by Cambridge University, 1–40 (Supplement 13 to Journal of Palaeontology, 25(1)). https://doi.org/10.1017/S0022336000061928

Foster, M. (1973). Ordovician receptaculitids from California and their significance. Lethaia, 6, 35–65. https://doi.org/10.1111/j.1502-3931.1973.tb00872.x

Gould, S. J., & Katz, M. (1975). Disruption of ideal geometry in the growth of receptaculitids; a natural experiment in theoretical morphology. Palaeobiology, 1, 1–20. https://doi.org/10.1017/S0094837300002153

Gümbel, C. W. (1876). Beitrage zur Kenntniss der Organisation und systematischen Stellung von Receptaculites. Abhandlungen der mathematisch-physikalischen Klasse der Koniglich Bayerischen Akademie der Wissenschaften, 2, 169–215.

Hall, J. (1861). Descriptions of new species of fossils from the investigations of the Survey. In: Calkins E. A. (Ed.). Report of the Superintendent of the Geological Survey of Wisconsin, 9–52. Madison, Wisconsin.

Hinde, G. J. (1884). On the Structure and Affinities of the family of the Receptaculitidae, including there in the Genera Ischadites, Murchison (=Tetragonis, Eichwald); Sclerospongia, Pengelly; Acantachonia, gen. nov. and Receptaculites, Defrance. Quarterly Journal of the Geological Society of London, 40, 795–849. https://doi.org/10.1144/GSL.JGS.1884.40.01-04.61

Konstantinenko, L. I. (2011). Ordovician stratigraphy of Transnistria. Tectonics and Stratigraphy, 38, 42–59. [Ukrainian]

Konstantinenko, L. I. (2013). Ordovician. In: Gozhyk, P. F. (ed.). Stratigraphy of Proterozoic and Fanerozoic of Ukraine. I. Stratigraphy of Upper Proterozoic, Paleozoic and Mesozoic of Ukraine, 167–175. Kyiv. [Ukrainian]

Nitecki, M. H. (1972a). Gametangia of Silurian lschadites hemisphericus (Receptaculitaceae, Dasycladales). Phycologia, 11(1), 1–4. https://doi.org/10.2216/i0031-8884-11-1-1.1

Nitecki, M. H. (1972b). North American Silurian receptaculitid algae. Fieldiana: Geology, 28, 1–108. https://doi.org/10.5962/bhl.title.5330

Nitecki, M. H., Bradof, K. L., & Nitecki, D. V. (1987). Literature of the receptaculitid algae: 1805–1980. Fieldiana: Geology, New Series, 1–6, 1–215. https://doi.org/10.5962/bhl.title.3507

Ross, R. J, Adler, F. J., Amsden, T. W., Bergstrom, D., Bergstrom, S. M. [et al.]. (1982). The Ordovician System in the United States, Correlation Chart and Explanatory Notes. International Union of Geological Sciences, 12, 1–73.

Roemer, F. A. (1861). Die fosile Fauna der Silurschen Deluvial-Geschiebe von Sadewitz bei Oels in Nieder-Schlesien, 1–143. Breslau. https://www.digitale-sammlungen.de/de/view/bsb10226365

Salter, J. W. (1859). Figures and Descriptions of Canadian organic remains. Decade I: Fossils from the base of the Trenton Group. Geological Survey of Canada, Montreal, 1–47. https://doi.org/10.5962/bhl.title.15051

Semeniuk, V., Byrnes J. G. (1971). Occurrence and significance of Ischadites Murchison in Ordovician Limestones at Bowan Park, New South Wales. Journal of the Geological Society of Australia, 18(3), 235–241. https://doi.org/10.1080/00167617108728763

Tsegelnyuk, P. D. (1972). The Western Slope of the Ukrainian Shield within the Boundaries of Podolian Region. In. Shulga, P. L. (Ed.), The Stratigraphy of Ukr.RSR. 8, 2. Ordovician: 169–183 [Ukrainian].

Turland, N. J., Wiersema, J. H., Barrie, F. R., Greuter, W., Hawksworth, D. L. [et al.]. (2018). International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile 159. Glashütten: Koeltz Botanical Books.

Walcott, C. D. (1884). On the Cambrian faunas of North America. Preliminary studies. III. Fauna of the Braintree argillites. Bulletin of the U.S. Geological Survey, 2(10), 43–49.

Zittel, K. A von. (1924). Grundzüge der Palaeontologie (Palȁozoologie). Neubearbeitet von dr. Ferdinand Broili. I. Abteilung Invertebrata. Druck und Verlag von R. Oldenbourg, München und Berlin, 1–733.