Thelodont Scales from the Lower Devonian Red Bay Group, Spitsbergen

Blom, Henning; Goujet, Daniel

doi:10.1111/1475-4983.00261

Cited by 15 publications

(8 citation statements)

References 5 publications

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“…47D left tubercle,=F) as in Cephalaspi s sp. The age of the strata differs, being middle-late Přidoli, late Silurian in Estonia and Early Devonian in Spitsbergen (if the whole Red Bay Group occurs to be of Early Devonian in age; Blieck & Heintz 1979; Blieck et al 1987; Blom & Goujet 2002).…”

Section: Systematic Palaeontologymentioning

confidence: 99%

Biodiversity of the Silurian osteostracans of the East Baltic

Märss¹,

Afanassieva²,

Blom³

2014

Earth and Environmental Science Transactions of the Royal Socie

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The sculpture and histology of osteostracan head shields and trunk squamations from the Silurian of Estonia are described, illustrated and used for the identification of disarticulated microremains collected from outcrop sections and numerous drill cores in Estonia and Latvia over the last 40 years. The scattered osteostracan material contains thousands of specimens of scales and shield fragments. The sculpture and histology of species of the previously identified eight genera in the region (Tremataspis, Dartmuthia, Saaremaaspis, Oeselaspis, Aestiaspis, Thyestes, Procephalaspis, Witaaspis) are redescribed, together with Ateleaspis, found in Estonia for the first time. The sculpture on the cornua of several taxa is described for the first time. The new taxa Tremataspis perforata sp. nov., Dartmuthia procera sp. nov., Eldaaspis miklii gen. et sp. nov., Tahulaspis ordinata gen. et sp. nov., Tahulaspis praevia gen. et sp. nov., Meelaidaspis gennadii gen. et sp. nov. and Ohesaareaspis ponticulata gen. et sp. nov. are established, based upon sculpture and histological characteristics of the exoskeleton. The supraoral field with denticles of that field are described for the first time in Oeselaspis pustulata, as is the supraoral plate with buccal denticles in Meelaidaspis gennadii gen. et sp. nov. Thin sections of all taxa (except of Witaaspis) have been studied. This work sheds light on East Baltic osteostracan biodiversity from the Maasi Beds of the Jaagarahu Stage, Sheinwoodian, lower Wenlock up to the Ohesaare Stage, upper Přidoli, Silurian.

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Section: Systematic Palaeontologymentioning

confidence: 99%

Biodiversity of the Silurian osteostracans of the East Baltic

Märss¹,

Afanassieva²,

Blom³

2014

Earth and Environmental Science Transactions of the Royal Socie

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“…Thelodonts have been successfully used in biostratigraphy since the 1960's (Gross 1967) with current global zonation schemes (in Gradstein et al 2012) developed for the Silurian (Turner 1973;Bassett et al 1982;Märss et al 1995;Blom 1999;Talimaa 2000) and Devonian, (Turner 1995a(Turner , 1999Blom and Goujet 2002;Hairapetian et al, in press). Subsequent to the Givetian-Frasnian boundary, thelodonts are restricted to the margins of northern Gondwana (Turner 1997;Trinajstic 2001;Märss et al 2007) and there is a marked reduction in diversity with the Turinidae Family represented by the species Australolepis seddoni (Seddon 1969;Turner and Dring 1981;Trinajstic and George 2009), Turinia hutkensis (Blieck and Goujet 1978;Hairapetian et al 2006) and a new genus and species of turiniid (Hairapetian et al, in press).…”

Section: Biostratigraphymentioning

confidence: 99%

Upper Devonian microvertebrates from the Canning Basin, Western Australia

Roelofs

Playton

Barham

et al. 2015

Acta Geologica Polonica

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A diverse microvertebrate fauna is described from the Virgin Hills and Napier formations, Bugle Gap Limestone Canning Basin, Western Australia. Measured sections at Horse Spring and Casey Falls (Virgin Hills Formation) and South Oscar Range (Napier Formation) comprise proximal to distal slope carbonates ranging in age from the Late Devonian Frasnian to middle Famennian. A total of 18 chondrichthyan taxa are identified based on teeth, including the first record of Thrinacodus tranquillus, Cladoides wildungensis, Protacrodus serra and Lissodus lusavorichi from the Canning Basin. A new species, Diademodus dominicus sp. nov. is also described and provides the first record of this genus outside of Laurussia. In addition, the upper range of Australolepis seddoni has been extended to Late Devonian conodont Zone 11, making it the youngest known occurrence for this species. The Virgin Hills and Napier formations microvertebrate faunas show close affinities to faunas recovered from other areas of Gondwana, including eastern Australia, Iran, Morocco and South China, which is consistent with known conodont and trilobite faunas of the same age.

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“…is specimen shows a typical turiniid body scale configuration, resembling the type species. It also resembles the mid-section of body scales of other turiniid taxa such as Turinia barentsia from the Ben Nevis Formation, Red Bay Group of Spitsbergen (Blom & Goujet 2002)…”

Section: Descriptionmentioning

confidence: 80%

“…ese two scales with their wide laterally expanded crown with several separate posterior points are comparable with the body scales of Turinia composita (Karatajūtė-Talimaa 2002: fig. 1G, H) and to some extent with some of Turinia barentsia Blom & Goujet, 2002(Blom & Goujet 2002). As with the other scales, the surface is severely scoured or etched and opening of dentine and bony aspidine structure can be seen.…”

Section: Turinia Sp Cf T Compositamentioning

confidence: 94%

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Early Devonian fishes from coastal De Long Strait, central Chukotka, Arctic Russia

et al. 2013

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Calcareous and sandy deposits from the basal members of the Enmakaj and Pil'hikaj formations in coastal exposures along the De Long Strait in central Chukotka, Arctic far-eastern Russia, have yielded two assemblages of fossil fish comprising heterostracan plate fragments, turiniid and other thelodont scales, acanthodian scales and a partial tooth, typical of the Old Red Sandstone facies. Exceptional are acanthothoracid placoderm platelets characteristic of marine facies. In addition a sarcopterygian fragment have been found in Member 1 of the Enmakaj Formation. Some scale surfaces show an unusual, scoured preservation. A Lochkovian age, and most probably basal Lochkovian, is supported for the Enmakaj assemblage, and a somewhat later Lochkovian age is supposed for the Pil'hikaj assemblage. e palaeobiogeographic affinities of these assemblages based on the heterostracans and thelodonts are with other Lochkovian occurrences in Arctic regions such as Severnaya Zemlya, Spitsbergen and the northern and north-eastern Old Red Sandstone Continent in general.

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Thelodont Scales from the Lower Devonian Red Bay Group, Spitsbergen

Cited by 15 publications

References 5 publications

Biodiversity of the Silurian osteostracans of the East Baltic

Biodiversity of the Silurian osteostracans of the East Baltic

Upper Devonian microvertebrates from the Canning Basin, Western Australia

Early Devonian fishes from coastal De Long Strait, central Chukotka, Arctic Russia

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