Aretz et al_2011.pdf - ORBi - Université de Liège

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Kölner Forum Geol. Paläont., 19 (2011)
M. ARETZ, S. DELCULÉE, J. DENAYER & E. POTY (Eds.)
Abstracts, 11th Symposium on Fossil Cnidaria and Sponges, Liège, August 19-29, 2011
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Dorlodotia Salée 1920 (Rugosa) and related taxa in the Dinantian (Lower
Carboniferous) of Russia and Ukraine
Maria R. HECKER
Borissiak Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya Str., 123, Moscow, 117997,
Russia; hecker@paleo.ru, Maria.Hecker@skynet.be
Dorlodotia Salée 1920 is widely distributed in the Lower Carboniferous of Europe and Asia. The genus is
distinguished by fasciculate growth habit, although can also show subcerioid trend, by minor septa poorly
developed or absent, by axial structure typically represented by lath-like columella which may be vertically
discontinuous or absent. Tabulae are conical in the presence of columella, flat or domed in its absence,
dissepimentarium commonly dominated by first order transeptal dissepiments. Increase is lateral.
In the Donets Basin, records of Dorlodotia (VASILYUK 1960; VASILYUK & ZHIZHINA 1978; OGAR 2010) are
from the Glubokaya (C1Vb-C1Vc, Moliniacian) and Donets (C1Vf, Warnantian) formations, and include D.
fomischevi ZHIZHINA 1978, D. pseudovermiculare MCCOY 1849 in the sense of OGAR (2010), both possibly
synonymous with D. briarti SALÉE 1920, and Pseudodorlodotia subkakimii VASSILYUK 1978. Lonsdaleia sokolovi
DOBROLYUBOVA 1958 from the Mikhailov horizon (Brigantian) of the Moscow Basin also belongs to this
genus. Dorlodotia includes at least one upper Moliniacian (?)-Livian species, Th. vermiculare DEGTJAREV 1973,
reported from the Zapadny Ural horizon of the western flank of the Central Urals by DEGTYAREV (1973)
and one Serpukhovian species, Thysanophyllum concavum GORSKY 1951, reported from the Novaya Zemlya
by GORSKY (1951).
GARWOOD (1912), SMITH (1916) and HILL (1940) considered Lonsdaleia praenuntia SMITH 1916 as the
ancestor of Dorlodotia pseudovermiculare (both species enter near the base of the Visean), and POTY (1981)
suggested that the genus Dorlodotia originated from the genus Lonsdaleia MCCOY 1849; evolution in the
lineage L. praenuntia – Dorlodotia pseudovermiculare went in the direction of disappearance of axial structure
and simplification of tabularium. Lonsdaleia praenuntia is restricted to the very base of the Visean, whereas
Lonsdaleia is an upper Warnantian-Serpukhovian genus. Studies of variability in Dorlodotia suggest that
Lonsdaleia praenuntia is also a Dorlodotia. In D. sokolovi, intracolonial variability involves inner tabularium
and axial structures, and some corallites show primitive dibunophylloid axial structures resembling those
of “Lonsdaleia” praenuntia. The strong similarity between “L”. praenuntia and Dorlodotia sokolovi was already
emphasized by DOBROLYUBOVA (1958).
The genus Ceriodotia established by DENAYER (in press) for cerioid species from the Livian of
Northwestern Turkey closely resembles Dorlodotia in corallite morphology and most probably originated
from it. Protolonsdaleia tenuis ZHIZHINA 1978 from the Glubokaya Formation (C1Vc, Moliniacian) of the
Donets Basin and probably Eolithostrotionella lissitzini ZHIZHINA 1960 from the Donets Formation (C1Vf,
Warnantian) of the same area belong to Ceriodotia. To this genus may be also attributed upper Moliniacian
(?)-Livian Eolithostrotionella grechovkae DEGTJAREV 1973 from the eastern flank of the South Urals and
probably Thysanophyllum druzhininae DEGTJAREV 1973 from the western flank of the Central Urals, both
reported from the Zapadny Ural horizon (DEGTYAREV 1973). Other species from the Dinantian of the
Donets Basin and Urals attributed to Protolonsdaleia LISSITZIN 1925 and Eolithostrotionella ZHIZHINA 1956
(VASILYUK 1960; ZHIZHINA 1960; DEGTYAREV 1973; VASILYUK & ZHIZHINA 1978) commonly show long minor
septa and resemble Acrocyathus d’Orbigny 1849.
DEGTYAREV, D.D. (1973): Novye vidy korallov zapadnoural’skogo (uglenosnogo) gorizonta. - Trudy Instituta geologii i
geokhimii Ural'skogo Nauchnogo Tsentra AN SSSR, 82: 191-205 (in Russian).
DENAYER, J. (in press): New Dorlodotia and related genera (Rugosa) from the Mississippian of Zonguldak and Bartin
(Black Sea, Northwestern Turkey). – Palaeontology.
DOBROLYUBOVA, T.A. (1958): Nizhnekamennougol’nye kolonial’nye chetyrekhluchevye korally Russkoy platformy. -
Trudy Paleontologicheskogo Instituta AN SSSR, 70: 226 pp. (in Russian).
GARWOOD, E.J. (1912): The Lower Carboniferous succession in the North-West of England. - Quarterly Journal of the
Geological Society of London 68: 449-586.
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