Arzonella exotica n. g. n. sp., a new brachiopod of indeterminate systematic position from the Lower Liassic (Broccatello) of Arzo (Southern Alps of Switzerland): A short note

Sulser, Heinz

doi:10.1007/s00015-004-1136-3

Cited by 3 publications

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“…Remarkably, the other two, previously described occurrences of Arzonellina (Arzo and Smokovac) were also found in isolated blocks. In Arzo, in the Southern Alps of Swit zerland, the genus was described from reworked clasts embedded in the Sinemurian Broccatello Formation (SULSER 2004, SULSER & FURRER 2005. In Smokovac (Montenegro) the block with Arzonellina was collected from Quaternary talus at the foot of Jurassic cliffs (SANDY et al 2021).…”

Section: Discussionmentioning

confidence: 99%

“…: R. suessi (GEMMELLARO) and bilobata (GEMMELLARO), but its internal morphology is significantly different. Due to the unusual internal structures, SULSER (2004) did not place Arzonellina into any taxo nomic order (used incertae sedis) and mentioned its "Pa leozoic look". SANDY et al (2018SANDY et al ( , 2021 produced further serial sections and attributed Arzonellina to a new family of the Kingenoidea (Terebratulida).…”

Section: Introductionmentioning

confidence: 99%

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Monospecific mass occurrence of a new species of the Early Jurassic genus Arzonellina (Brachiopoda) at Fenyveskút (Bakony Mountains, Hungary)

Vörös

2022

Földt. Közl.

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A peculiar slab of brachiopod coquina was found at Fenyveskút locality (Lókút, Bakony Mountains, Hungary). The current investigation demonstrated that it was a mass occurrence of monospecific brachiopods which belong to the kingenoid genus Arzonellina Sulser, 2005, recently described from Switzerland. Detailed investigations of the external and internal morphology (the latter by serial sections) of the specimens proved that they represent a new species: Arzonellina bogicae n. sp. This new species is introduced, described and illustrated here in details. The age of the brachiopod coquina and the new species is considered Sinemurian on the basis of circumstantial evidence from the locality Fenyveskút, where the lithologically very similar, Sinemurian Hierlatz Limestone is frequent. The previously documented occurrences of Arzonellina in Switzerland and Montenegro are also Sinemurian in age. For better understanding the sedimentary history of the slab of brachiopod coquina with Arzonellina, the Jurassic megabreccia at the locality Fenyveskút is re-described here. The lithology and fossils of the major components (blocks) and the matrix are documented in detail, and illustrated with thin section photomicrograps. Detailed study of the sediments that accumulated in an internal open space (vug) of the formerly lithified (cemented) brachiopod coquina revealed that the piece of the Arzonellina coquina was incorporated into the megabreccia in the Bajocian. The monospecific mass accumulation of brachiopods gave a hint to an association with hydrocarbon seeps (“cold seeps”). However stable isotopic results from the Fenyveskút locality do not show any signatures that would indicate the influence of that special environment.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Monospecific mass occurrence of a new species of the Early Jurassic genus Arzonellina (Brachiopoda) at Fenyveskút (Bakony Mountains, Hungary)

Vörös

2022

Földt. Közl.

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“…In some recent papers published after the appearance of the revised Treatise, serial sections of Mesozoic brachiopods were presented in the traditional manner with the ventral valve up (e.g. Pálfy 2003;Siblík 2003;García Joral & Goy 2004;Sulser 2004;Bitner & Motchurova-Dekova 2005;Bujtor 2006;Radulovi ç et al 2006;Andrade 2006;Motchurova-Dekova & Simon 2007;Radulovi ç et al 2007 and others). Thus, the future will show which orientation of the valves in post-Palaeozoic brachiopods will be established in practice.…”

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confidence: 99%

Orientations of the valves when presenting serial sections of post‐Palaeozoic brachiopods: tradition and utility versus the revised Treatise

Motchurova‐Dekova

Radulović

Bitner

2008

LET

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Orientations of the valves when presenting serial sections of post-Palaeozoic brachiopods: tradition and utility versus the revised Treatise NEDA MOTCHUROVA-DEKOVA, VLADAN RADULOVI 8 AND MARIA ALEKSANDRA BITNER The method of preparing serial transverse sections is one of the most important techniques used in brachiopod research to expose the internal morphology of the fossil shells (Muir-Wood 1934;Ager 1965;Sandy 1986Sandy , 1989Radulovi ç 1991). This method is particularly crucial in Mesozoic rhynchonellide and terebratulide brachiopod taxonomy (also for some Cenozoic taxa), when the shell of a brachiopod is filled with consolidated sediment, which is difficult to remove by mechanical preparation. Obtaining an objective picture of the internal morphology of the shell is decisive for making a reasoned judgment about their taxonomical placement. Very often serial sectioning is the only method applied to study the internal shell structures of brachiopods. A well-substantiated taxonomical decision depends, to a great extent, on the original quality of the sections and their subsequent presentation in the literature. Often slight and delicate details of the internal structures appear on one section only, thus attentive observation and documentation of the sections are important for taxonomy. This includes also the observance of an optimum magnification, documentation of the distances between the sections and stability in the manner of presenting the illustrations (here understanding the orientations of the sections in the literature, which is discussed herein). A consistent manner of orientation of the valves in the literature is important to reduce subjectivity while comparing serial sections published by different authors.Presenting serial transverse sections of Mesozoic rhynchonellide and terebratulide brachiopods with the ventral valve up and dorsal one down became customary after the publication of Muir-Wood (1934). Most subsequent works have followed her approach. This manner of orientation of the sections in the figures for Mesozoic and some . Exceptions are few. For instance G.A. Cooper (who was also an expert on Palaeozoic brachiopods, and mainly used dissections of specimens, and not serial sectioning) presented serial sections sometimes with the ventral valve down (Cooper 1959) or with the ventral valve up (Cooper 1989).Before publication of the revised edition of the Treatise (Kaesler 2002(Kaesler , 2006Selden 2007), this traditional manner was tacitly accepted. We refrain here from speculating about the reasons for this traditional arrangement of the illustrations of the brachiopod valves in serial sections. Perhaps one of the reasons is to illustrate above the elements, which were sectioned first (the ventral valve) and below -the details of the dorsal valve, which appear second. This is consistent also with the directionality of most scripts including the Greek alphabet and its successors, which settled on a left-to-right pattern and from the top to the bottom of the page. It is consistent also with th...

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New brachiopod family Arzonellinidae (Terebratulida) from the Early Jurassic (Sinemurian) of Montenegro, southern Europe, Mediterranean Province

et al. 2021

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Arzonella exotica n. g. n. sp., a new brachiopod of indeterminate systematic position from the Lower Liassic (Broccatello) of Arzo (Southern Alps of Switzerland): A short note

Cited by 3 publications

References 1 publication

Monospecific mass occurrence of a new species of the Early Jurassic genus Arzonellina (Brachiopoda) at Fenyveskút (Bakony Mountains, Hungary)

Monospecific mass occurrence of a new species of the Early Jurassic genus Arzonellina (Brachiopoda) at Fenyveskút (Bakony Mountains, Hungary)

Orientations of the valves when presenting serial sections of post‐Palaeozoic brachiopods: tradition and utility versus the revised Treatise

New brachiopod family Arzonellinidae (Terebratulida) from the Early Jurassic (Sinemurian) of Montenegro, southern Europe, Mediterranean Province

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