First occurrence of the genus Sphenothallus Hall, 1847 (Cnidaria) in the Carboniferous of the Dnipro-Donets Depression, Ukraine
DOI:
https://doi.org/10.4072/rbp.2023.1.02Abstract
The first occurrence of the problematic cnidarians Sphenothallus Hall (S. sp. 1 and S. sp. 2) is described from upper Viséan and ?Bashkirian (Carboniferous) black shales of the Dnipro-Donets Depression in NE Ukraine. Carboniferous Sphenothallus spp. from the Dnipro-Donets Depression apparently led an epifaunal gregarious lifestyle, preferring paleobasin areas with slow sedimentation rates, low current energy, and dysaerobic environments, as already suggested by literature data. The discovery of representatives of the genus Sphenothallus in Carboniferous strata of Ukraine significantly extends our knowledge about the geographic distribution of these animals. Further, it confirms their preference for environments with slow sedimentation.
Keywords: cnidarians, Sphenothallus, Carboniferous, Dnipro-Donets Depression, Ukraine.
RESUMO – Neste artigo é descrita a primeira ocorrência de cnidários problemáticos Sphenothallus Hall (S. sp. 1 e S. sp. 2) em folhelhos negros do Viseano Superior e ?Bashkiriano (Carbonífero), da Depressão de Dnipro-Donets, no NE da Ucrânia. Sphenothallus spp. carboníferos da Depressão de Dnipro-Donets foram, aparentemente, invertebrados gregários epifaunais, preferindo áreas da paleobacia com baixas taxas de sedimentação e baixa energia hídrica, em ambientes disaeróbio, conforme já sugeridos por dados de literatura. A descoberta de representantes do gênero Sphenothallus nos estratos carboníferos da Ucrânia amplia significativamente o nosso conhecimento sobre a distribuição geográfica desses animais e confirma, ainda mais, sua preferência por condições de baixa taxa de sedimentação.
Palavras-chave: cnidários, Sphenothallus, Carbonífero, Depressão de Dnipro-Donets, Ucrânia.
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