Paleozoic Ammonoid Biostratigraphy

Korn, Dieter; Klug, Christian

doi:10.1007/978-94-017-9633-0_12

Cited by 14 publications

(3 citation statements)

References 72 publications

(58 reference statements)

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“…The skeletal remains are preserved in ferruginous concretions of reddish colour found in the Thylacocephalan Layer (formerly described as the Phyllocarid Layer [23]) in which thylacocephalan arthropods are highly abundant [23]. Index ammonoids (Maeneceras horizon) within the host rock suggest an early middle Famennian age [24,25]. The material includes the cranial, visceral arch, and postcranial skeletal remains of an almost complete shark, as well as six three-dimensionally preserved crania.…”

Section: Methodsmentioning

confidence: 99%

The early elasmobranch Phoebodus : phylogenetic relationships, ecomorphology and a new time-scale for shark evolution

et al. 2019

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Anatomical knowledge of early chondrichthyans and estimates of their phylogeny are improving, but many taxa are still known only from microremains. The nearly cosmopolitan and regionally abundant Devonian genus Phoebodus has long been known solely from isolated teeth and fin spines. Here, we report the first skeletal remains of Phoebodus from the Famennian (Late Devonian) of the Maïder region of Morocco, revealing an anguilliform body, specialized braincase, hyoid arch, elongate jaws and rostrum, complementing its characteristic dentition and ctenacanth fin spines preceding both dorsal fins. Several of these features corroborate a likely close relationship with the Carboniferous species Thrinacodus gracia , and phylogenetic analysis places both taxa securely as members of the elasmobranch stem lineage. Identified as such, phoebodont teeth provide a plausible marker for range extension of the elasmobranchs into the Middle Devonian, thus providing a new minimum date for the origin of the chondrichthyan crown-group. Among pre-Carboniferous jawed vertebrates, the anguilliform body shape of Phoebodus is unprecedented, and its specialized anatomy is, in several respects, most easily compared with the modern frilled shark Chlamydoselachus . These results add greatly to the morphological, and by implication ecological, disparity of the earliest elasmobranchs.

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Section: Methodsmentioning

confidence: 99%

The early elasmobranch Phoebodus : phylogenetic relationships, ecomorphology and a new time-scale for shark evolution

et al. 2019

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“…The genus Pericyclus appears to be restricted to a limited early Late Tournaisian time interval. It was originally described from rare finds in the Calcaire de Calonne of Belgium (Delépine 1940;de Koninck 1844) and the Oued Znaïgui Formation of the Anti-Atlas of Morocco (Korn et al 2003(Korn et al , 2007Korn and Klug 2015). The most diverse assemblages with up to twenty species including several species of Pericyclus are in the Upper Kahla Formation of Gourara of western Algeria (Korn et al 2010b) and the Teguentour Formation of the Mouydir of southern Algeria (Korn et al 2010a).…”

Section: The Stratigraphic Age Of the Protocanites Bedsmentioning

confidence: 99%

Re-assessment of ammonoid specimens from the Early Carboniferous Protocanites Beds of the Badenweiler–Lenzkirch Zone (Schwarzwald, Central Variscan Belt): age constraints for a lithostratigraphic key bed

Korn

Montenari

2021

PalZ

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The Protocanites Beds of the Black Forest Massif (Germany) form an important lithostratigraphic key bed, as the index fossils contained in this formation enable correlation within large areas of the internal zone of the central Variscan Belt of Europe. Furthermore, the formation provides significant information on the geodynamic evolution of the Moldanubian Zone. The stratigraphic age of the formation has been a subject of controversy in the past; a Devonian to Viséan age has been proposed. To determine the age of the Protocanites Beds, two ammonoid specimens from the Protocanites Beds of Schönau are re-described here. They belong to Becanites abnobensis and Pericylcus princeps and fix the stratigraphic position of the Protocanites Beds to the early Late Tournaisian.

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“…One of these, Rhenechinus hopstaetteri Dehm, 1953 also co-occurrs with the echinocystitid Porechinus porosusDehm, 1961 in the Hunsrück slate of Germany(Dehm 1953;Dehm 1961). The Hunsrück slate is thought to represent deep paleoenvironents along the southeastern margin of Laurussia(Übelacker et al 2016), whereas the Spanish occurrences from the Cantabrian Zone represent shallower water deposits from slightly farther south(Korn and De Baets 2015). This indicates that echinocystitids may have continued to inhabit the oceans around Laurussia and its precursors from the Silurian into Devonian times.…”

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The morphologic and paleobiogeographic implications of a new early Silurian echinoid from Anticosti Island, Quebec, Canada

2022

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The Ordovician and Silurian are an exceptionally important interval of time for understanding the effects of ancient climate change on the paleobiodiversity of echinoderms. Despite this importance, the fossil record of many echinoderm groups during this interval is sparse. The echinoids, or sea urchins, are no exception; and new fossil finds are necessary to better understand their initial diversification during the lower Paleozoic. We herein report on material from a new genus and species of echinoid, Anticostiechinus petryki gen. et sp. nov., from the Silurian of Anticosti Island, Canada. The morphology of the tubercles and spines of A. petryki are atypical for echinoids, and the surfaces for spine articulation consist of rounded, concave indentations. Additionally, the bases of the spines are subspherical. Furthermore, A. petryki belongs to the family Echinocystitidae, which increases the known diversity and distribution of this family during the Silurian and provides insight into the biogeography of echinocystitids from the Silurian to Devonian.

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Paleozoic Ammonoid Biostratigraphy

Cited by 14 publications

References 72 publications

The early elasmobranch Phoebodus : phylogenetic relationships, ecomorphology and a new time-scale for shark evolution

The early elasmobranch Phoebodus : phylogenetic relationships, ecomorphology and a new time-scale for shark evolution

Re-assessment of ammonoid specimens from the Early Carboniferous Protocanites Beds of the Badenweiler–Lenzkirch Zone (Schwarzwald, Central Variscan Belt): age constraints for a lithostratigraphic key bed

The morphologic and paleobiogeographic implications of a new early Silurian echinoid from Anticosti Island, Quebec, Canada

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