Gracilitheca astronauta n. sp. and Nephrotheca sophia n. sp. (Hyolitha,Orthothecida) from the Cambrian of Czech Republic |
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| Authors: | Martin Valent Oldřich Fatka |
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| Affiliation: | 1. Department of Palaeontology, National Museum, Cirkusová 1740, 19300 Prague, Czech Republic;2. Charles University in Prague, Faculty of Science, Institute of Geology and Palaeontology, Albertov 6, 128 43 Prague 2, Czech Republic |
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| Abstract: | Two orthothecid hyoliths, Gracilitheca astronauta n. sp. and Nephrotheca sophia n. sp. are described from the “middle” Cambrian Buchava Formation of the Skryje-Tý?ovice Basin in the Czech Republic. The new forms are based on about thirty well-preserved external and internal moulds of both conchs and opercula. Gracilitheca astronauta n. sp. is classified under the family Gracilithecidae Sysoev, 1972 and may be distinguished by clearly triangular cross-section of the conch, whereas Nephrotheca sophia n. sp. is characterized by transversally elongated cardinal processes reaching the lateral opercular margin and is combined with the family Orthothecidae Sysoev, 1958 emended Malinky, 2009. Several specimens of G. astronauta show operculum preserved inside of the conch. Stratigraphic ranges and geographic distributions within the Skryje-Tý?ovice Basin are established for both taxa. |
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| Keywords: | Hyolitha Orthothecida &ldquo middle&rdquo Cambrian (Cambrian Series 3) Skryje-Tý ?ovice Basin Czech Republic |
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