Vertebrate Microremains from the Pragian, Emsian and Eifelian of the Prague Basin (Czech Republic)

Mergl, Michal; Vaškaninová, Valéria; Žigaitė, Živilė

doi:10.1515/fbgp-2017-0001

Cited by 4 publications

(10 citation statements)

References 19 publications

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“…N. costata scales was recorded in the Arabia and some Nostolepis spp. were recorded in the Kazhakstan, Africa and Sibumasu blocks (Blieck et al, 1984, Tông-Dzuy & Janvier, 1994Tông-Dzuy & Janvier, 1990;Burrow, Lelièvre & Janjou, 2006;Burrow, Ivanov & Rodina, 2010;Mergal, Vaškaninová & Žigaite Ž, 2017).…”

Section: Discussionmentioning

confidence: 99%

Nostolepisscale remains (stem Chondrichthyes) from the Lower Devonian of Qujing, Yunnan, China

Cui

Andreev

et al. 2021

PeerJ

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Based initially on microfossils, Nostolepis is one of the first known ‘acanthodians’, which constitute a paraphyletic assemblage of plesiomorphic members of the total group Chondrichthyes. Its wide distribution has potential implications for stratigraphic comparisons worldwide. Six species of Nostolepis have been reported in China, including one species from the Xitun Formation (Lochkovian, Lower Devonian) of Qujing, eastern Yunnan. Acid preparation of rock samples from the Xitun Formation has yielded abundant acanthodian remains. Based on both morphological and histological examinations, here we identify five species of Nostolepis, including two new species. N. qujingensis sp. nov. is characterized by thin scales devoid of the neck anteriorly and the dentine tubules rarely present in the anterior part of the crown. N. digitus sp. nov. is characterized by parallel ridges on anterior and lateral margins of the crown, and the neck constricted and ornamented with pore openings. We extend the duration of N. striata in China from the Pridoli of Silurian (Yulungssu Formation) to the Lower Devonian in Qujing and report the first occurrences of N. amplifica and N. consueta in this region. This study increases the diversity of the Lower Devonian Xitun Fauna and provides a better understanding of the paleogeographic distribution of Nostolepis.

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Section: Discussionmentioning

confidence: 99%

Nostolepisscale remains (stem Chondrichthyes) from the Lower Devonian of Qujing, Yunnan, China

Cui

Andreev

et al. 2021

PeerJ

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“…Among phosphate-shelled fossils, fragments of conulariid tests, byronid tubes, rare lingulate brachiopods (Paterula sp. ), caudal spines of phyllocarids, scales and tesserae of diverse vertebrates (Mergl et al 2017) were observed. 2.…”

Section: Survey Of Localitiesmentioning

confidence: 98%

“…Eurytholia sclerites are associated with diverse corals, crinoids, mostly smooth-shelled brachiopods, gastropods, trilobites and other fauna of local small biostrome. Among phosphate-shelled fossils, fragments of conulariid tests, sphenothallids, byronid tubes, abundant lingulate brachiopods (Kosagittella, Paterula, Acrosaccus, Chynithele, Lochkothele, Opatrilkiella, Praeoehlertella, Schizotreta, Havlicekion, Opsiconidion;Mergl & Ferrová 2009), caudal spines of phyllocarids and other crustaceans, conodonts, tesserae and fin spines of vertebrates (Mergl et al 2017) were observed.…”

Section: Survey Of Localitiesmentioning

confidence: 99%

Problematic Sclerites Eurytholia from the Lower and Middle Devonian of the Czech Republic

Mergl

2019

Folia Musei Rerum Naturalium Bohemiae Occidentalis. Geologica Et Paleobiologica

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Problematic phosphatic sclerites Eurytholia are reported for the first time from the Middle Devonian. Unequivocal sclerites were observed in limestones of Emsian to late Eifelian age in six localities of the Barrandian area of the Central Bohemia of the Czech Republic. Formerly observed size and shape variations of Eurytholia sclerites prevent formal description of a new species on few specimens of Emsian and Eifelian age. Therefore the new specimens are identified as Eurytholia aff. bohemica. Their presence indicates longer time range of the Eurytholia animal, covering not only the Ordovician, the Silurian and the earliest Devonian as known formerly, but also late Lower Devonian and the Middle Devonian. Similar features in morphology and histology of Eurytholia indicate relationship to a conodont Pseudooneotodus and a support suggestion about the vertebrate origin of Eurytholia sclerites.

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“…Phosphatic fossils are rare but vertebrate scales (Mergl et al . 2017); fragments of conulariids and organophosphatic linguliform brachiopods were ascertained. Samples yielded rare remnants of byronids and their discs.…”

Section: Geological and Palaeontological Settingsmentioning

confidence: 99%

Byronids and similar tubular fossils from the Devonian of the Barrandian area (Czech Republic)

Mergl

Kraft

2022

Earth and Environmental Science Transactions of the Royal Society of Edinburgh

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Byronids are problematic fossils of possible cnidarian affinity, only rarely reported from the Devonian, but never previously studied in the Barrandian area, Czech Republic. Two new species Prestephanoscyphus branzovensis sp. nov. and Prestephanoscyphus robustus sp. nov. are erected from the Lochkovian and the Eifelian, respectively. Four poorly known species referred to Byronia are described in open nomenclature from the Emsian and Eifelian. The new genus Parabyronia gen. nov. with the type species Parabyronia elegans sp. nov. is closely related to other sphenothallids but is distinguished by transverse ridges on its theca and short spines at the apertural end of the theca. Definite identification of phosphatic rings as the attachment structure of byronids was proved by new material of the Lochkovian age. A dwarf conularia Pidiconularia gen. nov. with the type species Pidiconularia tubulata sp. nov. is remarkable by its minute size and very fine ornament; its conulariid affinity is proved by subrectangular cross-section and four internal carinae. Microstructure of theca of Prestephanoscyphus is characterised by alternation of compact laminae of aligned columnar microcrystallites and chambered laminae with isometric microcrystallites of apatite. Accretionary growth of byronid theca and structure of the holdfast with basal opening for the adhesive pedal disc support their cnidarian affinity although they likely display the bilateral instead of tetramerous symmetry. The protective function of bilaterally symmetrical whorls of internal apophyses in Prestephanoscyphus is suggested and their role in strengthening of thecal wall or supporting function of gastric septa are disputed. The byronids are regarded as epibionts rather than attached to the rocks. They are representatives of benthic groups with phosphatic shells that declined with decreasing availability of phosphorus in seas and oceans.

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Vertebrate Microremains from the Pragian, Emsian and Eifelian of the Prague Basin (Czech Republic)

Cited by 4 publications

References 19 publications

Nostolepisscale remains (stem Chondrichthyes) from the Lower Devonian of Qujing, Yunnan, China

Nostolepisscale remains (stem Chondrichthyes) from the Lower Devonian of Qujing, Yunnan, China

Problematic Sclerites Eurytholia from the Lower and Middle Devonian of the Czech Republic

Byronids and similar tubular fossils from the Devonian of the Barrandian area (Czech Republic)

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