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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similarity to the type material (FOMICHEV 1953) allows to establish the species range from the latest
Myachkovian to the sagittalis zone of the Kasimovian. B. timanoides timanoides FEDOROWSKI 1975, Ambigua
Lm., Svalbard also bears the rather simple axial structure, but shows shorter minor septa (FEDOROWSKI
1975: 61, fig.8). The group of corals possessing simplified features is different from the topotypes of B.
conicum demonstrating well developed axial structures. The typical B. conicum is similar with the specimen
assigned to a new Bothrophyllum species determined in the Donskaya Luka at the basal Kasimovian (in its
traditional meaning).
Siedleckia FEDOROWSKI 1975 is another abundant genus among the caninomorph corals of the transitional
interval. It appeared in the Moscovian (the type species S. mutafii (GORSKY 1978) and it also occurs in the
lowermost Kasimovian in the Donskaya Luka and is known from the Kasimovian of the Ambigua Lm. and
the Urals (GREK 1936).
The specific ontogenetic development of the specimens from the Donskaya Luka seems to be a strong
reason to propose a new genus. It shows the long duration of the primitive amplexoid neanic stage. By the
short minor septa, general caninomorph habitus of the mature stage the new genus is similar with
Caninophyllum domheri FOMICHEV 1953, forma b. The long counter septum brings it together with B.
timanicum timanicum (FEDOROWSKI 1975) and some Timania species, but the difference in ontogeny
contradicts the typical succession of the evolution stages of both genera. Pseudotimania DORBOLYUBOVA &
KABAKOVICH 1948 bearing caninomorph features at the mature stages has long cardinal septa at the early
stages and more or less visible alar fossules. In the Urals P. kasimovi was found in the Podolskian and P.
irregularis - in the Myachkovian. Pseudotimania is typical for the Myachkovian in the Moscow Basin (P.
mosquensis, P. kasimovi) and occurs at the base of the Kasimovian in Donskaya Luka (P. kasimovi).
This study is supported by RFBR grant 09-05-00101-а.
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