The placoderm Plourdosteus livonicus (Eastman) in the early Frasnian of the Central Devonian Field and the trophic structure of the Mikhailovskii Fish Assemblage

Moloshnikov, S. V.

doi:10.1134/s0031030108060063

Cited by 3 publications

(5 citation statements)

References 3 publications

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“…Escuminaspis and Levesquaspis were detritivores most likely consuming both bottom detritus and particles and organisms suspended in the water column (Moloshnikov 2008). Bothriolepis canadensis, Plourdosteus canadensis and the dipnoans are considered benthivores (Moloshnikov 2008). The four species of acanthodians were most likely planktivores (Trewin 1986) and contributed as forage fish in the fish palaeocommunity.…”

Section: Taxonomic and Palaeoecological Diversity (Invertebrates And mentioning

confidence: 98%

“…Based on their relatively flattened morphology, three species (Escuminaspis laticeps, Levesquaspis patteni, Bothriolepis canadensis) are considered as bottom dwellers. Escuminaspis and Levesquaspis were detritivores most likely consuming both bottom detritus and particles and organisms suspended in the water column (Moloshnikov 2008). Bothriolepis canadensis, Plourdosteus canadensis and the dipnoans are considered benthivores (Moloshnikov 2008).…”

Section: Taxonomic and Palaeoecological Diversity (Invertebrates And mentioning

confidence: 99%

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The Miguasha Fossil-Fish-Lagerstätte: a consequence of the Devonian land–sea interactions

Cloutier

Proust

Tessier

2011

Palaeobio Palaeoenv

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The evolution of vertebrate assemblages in terms of fluctuating environments has rarely been investigated for the Devonian period. Variation of biodiversity (richness, abundance and species composition) in the diverse Devonian fish assemblage of the Escuminac Formation (Quebec, Canada) is analysed in response to changes in lithofacies, depositional environment and taphonomy through time. Five sequences within an inner wave-dominated estuary show shifts in continentalisation. Although a ubiquitous fish assemblage is identified throughout the formation, species are more diversified and species composition is better structured during relative sea-level rise than during still-stand and relative sea-level fall. Konservat and Konzentrat FossilLagerstätte horizons occur in the transgressive phase of the sequences.

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Section: Taxonomic and Palaeoecological Diversity (Invertebrates And mentioning

confidence: 98%

Section: Taxonomic and Palaeoecological Diversity (Invertebrates And mentioning

confidence: 99%

The Miguasha Fossil-Fish-Lagerstätte: a consequence of the Devonian land–sea interactions

Cloutier

Proust

Tessier

2011

Palaeobio Palaeoenv

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“…This is corroborated by the similarities of L. ziregensis with Mcnamaraspis kaprios , a plourdosteid with a similarly broad sub-rectangular outline of the PSG with two ventral margins preceding the lateral and posterior processes and lacking a mesial tooth like L. ziregensis . However, the phylogenetic position of plourdosteids is uncertain and placed with both coccosteomorphs (Ørvig 1980 ; Moloshnikov 2008 ) and pachyosteomorphs (Vézina 1990 ). A feasible explanation for this long-lasting debate is the potential paraphyly of the group (Carr and Hlavin 1995 ; Carr 2004 ; Anderson 2008 ).…”

Section: Systematic Paleontologymentioning

confidence: 99%

A large Middle Devonian eubrachythoracid ‘placoderm’ (Arthrodira) jaw from northern Gondwana

et al. 2021

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For the understanding of the evolution of jawed vertebrates and jaws and teeth, ‘placoderms’ are crucial as they exhibit an impressive morphological disparity associated with the early stages of this process. The Devonian of Morocco is famous for its rich occurrences of arthrodire ‘placoderms’. While Late Devonian strata are rich in arthrodire remains, they are less common in older strata. Here, we describe a large tooth-bearing jaw element of Leptodontichthys ziregensis gen. et sp. nov., an eubrachythoracid arthrodire from the Middle Devonian of Morocco. This species is based on a large posterior superognathal with a strong dentition. The jawbone displays features considered synapomorphies of Late Devonian eubrachythoracid arthrodires, with one posterior and one lateral row of conical teeth oriented postero-lingually. μCT-images reveal internal structures including pulp cavities and dentinous tissues. The posterior orientation of the teeth and the traces of a putative occlusal contact on the lingual side of the bone imply that these teeth were hardly used for feeding. Similar to Compagopiscis and Plourdosteus, functional teeth were possibly present during an earlier developmental stage and have been worn entirely. The morphological features of the jaw element suggest a close relationship with plourdosteids. Its size implies that the animal was rather large.

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“…Escuminaspis and Levesquaspis were detritivores, most likely consuming both bottom detritus and particles and organisms suspended in the water column, as suggested for Devonian osteostracans from Russia (Moloshnikov 2008). Bothriolepis, Plourdosteus and the dipnoans are considered benthivores (Moloshnikov 2008). The four Miguasha acanthodian species were likely planktivores, as suggested for anatomically similar acanthodians from Scotland (Trewin 1986).…”

Section: Evolutionary Significance Of the Miguasha Biotamentioning

confidence: 99%

“…The relatively flattened morphology and dorsal eye position of the osteostracan Escuminaspis and Levesquaspis, and the placoderm Bothriolepis, imply that they were also bottom dwellers. Escuminaspis and Levesquaspis were detritivores, most likely consuming both bottom detritus and particles and organisms suspended in the water column, as suggested for Devonian osteostracans from Russia (Moloshnikov 2008). Bothriolepis, Plourdosteus and the dipnoans are considered benthivores (Moloshnikov 2008).…”

Section: Evolutionary Significance Of the Miguasha Biotamentioning

confidence: 99%

Great Canadian Lagerstätten 4. The Devonian Miguasha Biota (Québec): UNESCO World Heritage Site and a Time Capsule in the Early History of Vertebrates

Cloutier¹

2013

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Over the past 170 years, the Late Devonian Miguasha biota from eastern Canada has yielded a diverse aquatic assemblage including 20 species of lower vertebrates (anaspids, osteostracans, placoderms, acanthodians, actinopterygians and sarcopterygians), a more limited invertebrate assemblage, and a continental component including plants, scorpions and millipedes. Originally interpreted as a freshwater lacustrine environment, recent paleontological, taphonomic, sedimentological and geochemical evidence corroborates a brackish estuarine setting. Over 18,000 fish specimens have been recovered showing various modes of fossilization, including uncompressed material and soft-tissue preservation. Most vertebrates are known from numerous, complete, articulated specimens. Exceptionally well-preserved larval and juvenile specimens have been identified for 14 out of the 20 species of fishes, allowing growth studies. Numerous horizons within the Escuminac Formation are now interpreted as either Konservat– or Konzentrat–Lagerstätten.SOMMAIREAu cours des 170 dernières années, le biote du Dévonien supérieur de Miguasha de l’Est du Canada a fourni un assemblage aquatique diversifié, comprenant 20 espèces de vertébrés inférieurs (anaspides, ostéostracés, placodermes, acanthodiens, actinoptérygiens et sarcoptérygiens) et un assemblage peu diversifié d’invertébrés ainsi qu’une composante continentale, représentée par des plantes, des scorpions et des mille-pattes. À l’origine interprété comme un milieu lacustre d’eau douce, les dernières preuves paléontologiques, taphonomiques, sédimentologiques et géochimiques confirment un environnement saumâtre rappelant celui d’un estuaire. Plus de 18,000 fossiles de poissons ont été découverts montrant différents états de conservation, notamment en trois dimensions et la préservation de tissus mous. La plupart des vertébrés sont connus par de nombreux spécimens complets et articulés. Des spécimens de larves et de juvéniles, exceptionnellement bien conservés, ont été identifiées pour 14 des 20 espèces de poissons permettant des études détaillées de leur croissance. De nombreux horizons au sein de la Formation d’Escuminac sont interprétés soit comme des Konservat– ou Konzentrat–Lagerstätten.

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The placoderm Plourdosteus livonicus (Eastman) in the early Frasnian of the Central Devonian Field and the trophic structure of the Mikhailovskii Fish Assemblage

Cited by 3 publications

References 3 publications

The Miguasha Fossil-Fish-Lagerstätte: a consequence of the Devonian land–sea interactions

The Miguasha Fossil-Fish-Lagerstätte: a consequence of the Devonian land–sea interactions

A large Middle Devonian eubrachythoracid ‘placoderm’ (Arthrodira) jaw from northern Gondwana

Great Canadian Lagerstätten 4. The Devonian Miguasha Biota (Québec): UNESCO World Heritage Site and a Time Capsule in the Early History of Vertebrates

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