Sloveniaxon, a new genus of ahermatypic Rugosa (Anthozoa) from the basal Permian (Asselian) of Slovenia

Olga L. KOSSOVAYA; Matevž NOVAK; Dieter WEYER

Geologica Belgica

1374-8505 2034-1954

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Olga L. KOSSOVAYA, Matevž NOVAK & Dieter WEYER

Sloveniaxon, a new genus of ahermatypic Rugosa (Anthozoa) from the basal Permian (Asselian) of Slovenia

(volume 15 (2012) — number 4 - Proceedings of the XIth International Symposium on Fossil Cnidaria and Porifera)

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Mots-clés : Variaxoninae, Cyathaxonia-homoeomorphs, Karavanke-Mts., Eurasia-distribution, Bashkirian-Capitanian.

Abstract

The proposal of the new genus is based on Sloveniaxon asseliensis sp. nov. from the late Early Asselian of the Dovžanova Soteska section NNE of Tržič (Karavanke Mts.), in a Cyathaxonia facies assemblage with Cyathaxonia and Lophophyllidium. Together with Variaxon Fedorowski, 2010, the taxon is classified as Variaxoninae Fedorowski, 2010 of Antiphyllidae Iljina, 1970 (suborder Zaphrentoidina Schouppé & Stacul, 1959), descending from Rotiphyllum Hudson, 1942. Sloveniaxon was widely distributed in Eurasia (Spain, Hungary, Russia, Ukraine, Iran, Timor, China) during Late Bashkirian, Moscovian, Asselian, Sakmarian?, Late Artinskian, Capitanian, Dzhulfian? times; there it had been mostly misidentified as really quite homoeomorphic Cyathaxonia Michelin, 1847 or Cyathocarinia Soshkina, 1928 (suborder Cyathaxoniina Spasskiy, 1977). The diagnostic difference is a true aseptal columella (Cyathaxoniinae Milne-Edwards & Haime, 1850) against a massive septal pseudocolumella (Variaxoninae), best visible in cross sections of the calice. For unambiguous identification, often neglected studies of the calicular phase are demanded to see the axial boss in statu nascendi without later stereoplasmatic thickening and diagenetic recrystallisations.

Future modern revisions (including intensive serial sectioning) should verify the proposed transfer of the following previous species into Sloveniaxon: Cyathaxonia (Cyathocarinia) multituberculata Soshkina, 1928, Cyathaxonia angularis Fomichev, 1953, Cyathaxonia archangelskyi Fomichev, 1953, Cyathaxonia lomonossovi Fomichev, 1953, Cyathocarinia crassata Guo, 1980, Cyathaxonia degrootae Rodríguez, 1984, Cyathaxonia pinguis Rodríguez & Kullmann, 1999, Cyathaxonia sp.n.B, Rodríguez & Kullmann, 1999.

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Olga L. KOSSOVAYA, Matevž NOVAK & Dieter WEYER, «Sloveniaxon, a new genus of ahermatypic Rugosa (Anthozoa) from the basal Permian (Asselian) of Slovenia», Geologica Belgica [En ligne], volume 15 (2012), number 4 - Proceedings of the XIth International Symposium on Fossil Cnidaria and Porifera, 361-369 URL : https://popups.uliege.be/1374-8505/index.php?id=3839.