Abstract
A new strophomenid subfamily Anechophragmiidae is distinguished based on the peculiarities of cardinalia. The strophomenids of this subfamily lack cardinal process at all developmental stages; their socket ridges accrete and form a high plate, which closes the pedicle opening. Two genera are referred to the subfamily: Anechophragma Neuman, 1976 and Biseptata gen. nov. with new species B. briani sp. nov. from the Ordovician of the Leningrad Region. The shell structure, exterior, endoskeleton and ontogeny of A. rarum and B. briani were studied in detail due to the excellent preservation of the material. Two species are referred to Anechophragma: A. rarum Neuman, 1976 and A. alexandrae (Andreev, 1993).
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Andreev, D.A., New Ordovician Plectambonitaceans (Brachiopoda) from Tuva and the Leningrad Region, Paleontol. Zh., 1993, no. 2, pp. 50–55.
Cocks, L.R.M. and Rong Jia-yu, Classification and Review of the Brachiopod Superfamily Plectambonitacea, Bull. Brit. Mus. Nat. Hist., Geol., 1989, vol. 45, pp. 77–163.
Cocks, L.R.M. and Rong Jia-yu, Order Strophomenida, in Treatise on Invertebrate Paleontology, vol. 2. Part H. Brachiopoda (Revised), Vol. 2, Kaesler, R.L., Ed., Boulder (Co)-Lawrence (Ks): Geol. Soc. Am.-Univ. Kansas Press, 2000, pp. 216–299.
Egerquist, E., Revision of the Ordovician Plectambonitoid Brachiopod Ujukella Andreev and Related Genera, GFF, 1999, vol. 121, pp. 325–332.
Hansen, J. and Harper, D.A.T., Brachiopod Microfaunal Distribution through the Upper Volkhov-Lower Kunda (Lower Ordovician) Rocks, Lynna River, St. Petersburg Region, Bull. Geol. Soc. Denmark, 2003, vol. 50, pp. 45–53.
Jaanusson, V., Two Plectambonitacean Brachiopods from the Dalby Limestone (Ordov.) of Sweden, Bull. Geol. Inst. Univ. Uppsala, 1962, vol. 39, no. 10, pp. 1–9.
Kutorga, S., Über das silurische und devonische Schichten-System von Gatschina, Verh. der Russ. Kais. Min. Gesellsch. zu St. Petersb., Jahre 1845–1846, St. Petersburg: Carl Kray, 1846, pp. 85–139.
Madison, A.A., Formation of Cardinal Process in Ordovician Strophomenids, Paleontol. J., 2012, vol. 46, no. 12, pp. 1370–1382.
Neuman, R.B., Early Ordovician (Late Arenig) Brachiopods from Virgin Arm, New World Island, Newfoundland, Geol. Surv. Can. Bull., 1976, no. 261, pp. 11–61.
Rong Jia-yu and Cocks, L.R.M., True Strophomena and a Revision of the Classification and Evolution of Strophomenoid and “Strophodontoid” Brachiopods, Palaeontology, 1994, vol. 37, pp. 651–694.
Rubel, M., New Species of the Brachiopod Family Dalmanellidae from the Llandovery of Estonia, Tr. Inst. Geol. Akad. Nauk ESSR, 1961, vol. 13, pp. 173–186.
Russian and International Bryozoan Conference “Bryozoa of the World,” A Field Excursion Guide, Dronov, A.V., Ed., St. Petersburg: Terra Nostra, 1997.
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Original Russian Text © A.A. Madison, 2013, published in Paleontologicheskii Zhurnal, 2013, No. 1, pp. 24–37.
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Madison, A.A. New brachiopod subfamily Anechophragmiinae (Strophomenida) from the Ordovician of the Leningrad Region. Paleontol. J. 47, 23–35 (2013). https://doi.org/10.1134/S0031030113010061
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DOI: https://doi.org/10.1134/S0031030113010061