New Late Devonian strophomenids (Brachiopoda) from Mongolia

Alekseeva, R. E.

doi:10.1134/s0031030111030038

Cited by 5 publications

(5 citation statements)

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“…In north-western France, namely in the Avesnois area (Figure 2) which corresponds to the western prolongation of the Namur-Dinant Basin, Leptaeninae were reported in the uppermost Famennian by Dehée (1929) and Brice et al (2013), but this occurrence has been challenged by . Elsewhere in the world, several authors reported their occurrence in Frasnian and Famennian deposits (e.g., Karapetov, 1971;Xu (in Xu and Yao, 1988), Mergl and Massa, 1992;Brice in Brice et al, 2005;Alekseeva, 2011;Popov in Ghobadi Pour et al, 2013;Baranov et al, 2016;Zong et al, 2016). The absence of Leptaeninae from the Givetian-Famennian interval in southern Belgium is quite strange as, during the same time, the long-ranging orthide genus Schizophoria, which was already associated to the last Eifelian Leptaeninae, did not temporarily disappear and is even one of the first to recover after the FrasnianFamennian Crisis in Belgium (Mottequin, 2008b;Mottequin and Poty, 2016), and persisted after the Hangenberg Crisis.…”

Section: Stratigraphic Summarymentioning

confidence: 99%

New insights on Tournaisian–Visean (Carboniferous, Mississippian) athyridide, orthotetide, rhynchonellide, and strophomenide brachiopods from southern Belgium

Mottequin

Simon

2017

Palaeontologia Electronica

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Section: Stratigraphic Summarymentioning

confidence: 99%

New insights on Tournaisian–Visean (Carboniferous, Mississippian) athyridide, orthotetide, rhynchonellide, and strophomenide brachiopods from southern Belgium

Mottequin

Simon

2017

Palaeontologia Electronica

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“…The upper jaw described here occurs within a bedrock sample MPC-Fh200/10.4 from the Yamaat Gol locality in western Mongolia [17][18][19]. The absence of endochondral bone and the tight spacing of the tubercles indicate that this palatoquadrate does not belong to Minjinia, the only 'placoderm' taxon so far named from that locality.…”

Section: Specimensmentioning

confidence: 80%

A well-preserved ‘placoderm’ (stem-group Gnathostomata) upper jaw from the Early Devonian of Mongolia clarifies jaw evolution

et al. 2023

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The origin of jaws and teeth remains contentious in vertebrate evolution. ‘Placoderms’ (Silurian-Devonian armoured jawed fishes) are central to debates on the origins of these anatomical structures. ‘Acanthothoracids’ are generally considered the most primitive ‘placoderms’. However, they are so far known mainly from disarticulated skeletal elements that are typically incomplete. The structure of the jaws—particularly the jaw hinge—is poorly known, leaving open questions about their jaw function and comparison with other placoderms and modern gnathostomes. Here we describe a near-complete ‘acanthothoracid’ upper jaw, allowing us to reconstruct the likely orientation and angle of the bite and compare its morphology with that of other known ‘placoderm’ groups. We clarify that the bite position is located on the upper jaw cartilage rather than on the dermal cheek and thus show that there is a highly conserved bite morphology among most groups of ‘placoderms’, regardless of their overall cranial geometry. Incorporation of the dermal skeleton appears to provide a sound biomechanical basis for jaw origins. It appears that ‘acanthothoracid’ dentitions were fundamentally similar in location to that of arthrodire ‘placoderms’, rather than resembling bony fishes. Irrespective of current phylogenetic uncertainty, the new data here resolve the likely general condition for ‘placoderms’ as a whole, and as such, ancestral morphology of known jawed vertebrates.

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“…Devonian and Mississippian conglomerate, sandstone, and siltstone containing marine fossils complete the sequence. Alekseeva (1993) described the Tariat Formation as a terrigenous sequence with 70 m of basal conglomerates overlain by 150 m of green sandstones, siltstones, and mudstones with abundant brachiopods and plant fossils in darker siltstones. An overlying terrigenous sequence contains 250 m dark-gray to greenish siltstones and sandstones also with abundant brachiopods.…”

Section: Geological Settingmentioning

confidence: 99%

“…The Tariat Formation is unconformably overlain by lower Carboniferous conglomerates. The Tariat Formation is Emsian in age according to the presence of the strophomenoid Maoristrophia kailensis Shishkina, 1990, a brachiopod that defines the Mongolian Chulun Horizon (Alekseeva, 1993). This horizon correlates with the Salairka Horizon in Siberia and the Polygnathus kitabicus Conodont Biozone in the basal Emsian (Yolkin et al, 2000).…”

Section: Geological Settingmentioning

confidence: 99%

Gennaeocrinus tariatensis, a new Emsian (Devonian) monobathrid crinoid from the Tarvagatay Terrane of Mongolia

Waters

Ausich

2021

J. Paleontol.

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Gennaeocrinus tariatensis new species is an Emsian (Devonian) monobathrid crinoid described from the Tarvagatay Terrane of Mongolia and part of the Central Asian Orogenic Belt. The Tarvagatay Terrane is an arc terrane that accreted to the southern margin of the Siberian Craton. Gennaeocrinus tariatensis was collected from the Emsian Tariat Formation, a terrigenous sequence of conglomerates, sandstones, and siltstones. Associated faunas include brachiopods, molluscs, and rare tabulate corals. Although Gennaeocrinus is well known from the Emsian–Givetian of North America, this is the first occurrence of the genus outside Laurussia. Mongolia is a large country with many terranes having varied paleogeographic, sedimentological, and tectonic histories; but reports of Paleozoic echinoderms are rare. The crinoid occurrence from the Tariat Formation is from the same age as previously described Emsian crinoids from the Chuluum Formation but differs significantly in sedimentology, paleogeography, and paleolatitude. UUID: http://zoobank.org/d87cb083-4360-41e5-ac90-1b8ef625a31d

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New Late Devonian strophomenids (Brachiopoda) from Mongolia

Cited by 5 publications

References 0 publications

New insights on Tournaisian–Visean (Carboniferous, Mississippian) athyridide, orthotetide, rhynchonellide, and strophomenide brachiopods from southern Belgium

New insights on Tournaisian–Visean (Carboniferous, Mississippian) athyridide, orthotetide, rhynchonellide, and strophomenide brachiopods from southern Belgium

A well-preserved ‘placoderm’ (stem-group Gnathostomata) upper jaw from the Early Devonian of Mongolia clarifies jaw evolution

Gennaeocrinus tariatensis, a new Emsian (Devonian) monobathrid crinoid from the Tarvagatay Terrane of Mongolia

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