The Ordovician conodont Trapezognathus Lindström, 1955 in the Andean Basin, Argentina

Carlorosi, Josefina; Heredia, Susana

doi:10.1127/0077-7749/2013/0311

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…Description : The material recovered from Santa Gertrudis Formation was previously described by Carlorosi & Heredia (2013), who illustrated only Pb elements. New Pa elements were recovered from this unit and are described here.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

Selected Middle Ordovician key conodont species from the Santa Gertrudis Formation (Salta, Argentina): an approach to its biostratigraphical significance

2016

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We have analysed a newly exposed conodont association from the Santa Gertrudis Formation in the Mojotoro Range, Eastern Cordillera of Salta province, Argentina. The key speciesBaltoniodus triangularis(Lindström),Trapezognathus quadrangulum(Lindström) andErraticodon patuCooper are present. A new species of the genusBaltoniodus(Baltoniodus cooperisp. nov.) and elements ofPeriodonaff.P. flabellumare included in this conodont study. The key conodontB. triangularisindicates an age of lower Dapingian (Middle Ordovician) for the bearing strata. This was also recognized in other localities of the Eastern Cordillera, allowing their correlation. The conodonts from the Santa Gertrudis Formation provide conclusive elements on palaeogeographic interpretation by sharing species with Baltoscandia, South China and Australia, suggesting strong faunal affinities with these provinces.

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Section: Systematic Palaeontologymentioning

confidence: 99%

Selected Middle Ordovician key conodont species from the Santa Gertrudis Formation (Salta, Argentina): an approach to its biostratigraphical significance

2016

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“…Widely gaping basal cavities of all the elements of these apparatuses are typical for many other high latitude prioniodontids of the Ordovician, but no predecessor of the lineage has been reliably identified as yet. It is possible that it was the Baltic latest Arenig Trapezognathus (e.g., Bagnoli & Stouge 1997; Carlorosi & Heredia 2013).…”

Section: Relationships Of the Icriodontidsmentioning

confidence: 99%

Evolutionary roots of the conodonts with increased number of elements in the apparatus

Dzik¹

2015

Earth and Environmental Science Transactions of the Royal Socie

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Four kinds of robust elements have been recognised in Amorphognathus quinquiradiatus Moskalenko, 1977 (in Kanygin et al. 1977) from the early Late Ordovician of Siberia, indicating that at least 17 elements were present in the apparatus, one of them similar to the P1 element of the Early Silurian Distomodus. The new generic name Moskalenkodus is proposed for these conodonts with a pterospathodontid-like S series element morphology. This implies that the related Distomodus, Pterospathodus and Gamachignathus lineages had a long cryptic evolutionary history, probably ranging back to the early Ordovician, when they split from the lineage of Icriodella, having a duplicated M location in common. The balognathid Promissum, with a 19-element apparatus, may have shared ancestry with Icriodella in Ordovician high latitudes, with Sagittodontina, Lenodus, Trapezognathus and Phragmodus as possible connecting links. The pattern of the unbalanced contribution of Baltoniodus element types to samples suggests that duplication of M and P2 series elements may have been an early event in the evolution of balognathids. The proposed scenario implies a profound transformation of the mouth region in the evolution of conodonts. The probable original state was a chaetognath-like arrangement of coniform elements; all paired and of relatively uniform morphology. This was modified at the origin of protopanderodontids by the introduction of a medial S0 element, which resulted in the separation of the exposed unit of M and S series elements from the P series elements hidden in the throat. A rotation of the S series elements to an almost horizontal position in early prioniodontids may have promoted duplication of the M element pair. In Gamachignathus, Icriodella and Pterospathodus lineages, these elements are differentiated morphologically. Subsequent anteriorward bending of the P element series caused duplication of the balognathid P2 element pair, but they remained undifferentiated, even in the otherwise elaborate Promissum. The whole clade of conodonts with supernumerary element pairs in the apparatus has its roots in high latitudes of the Ordovician.

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Lower-middle Darriwilian index conodonts from the Precordillera: new taxonomical approaches

Mestre

Heredia

2019

Palaeobio Palaeoenv

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The Ordovician conodont Trapezognathus Lindström, 1955 in the Andean Basin, Argentina

Cited by 6 publications

References 7 publications

Selected Middle Ordovician key conodont species from the Santa Gertrudis Formation (Salta, Argentina): an approach to its biostratigraphical significance

Selected Middle Ordovician key conodont species from the Santa Gertrudis Formation (Salta, Argentina): an approach to its biostratigraphical significance

Evolutionary roots of the conodonts with increased number of elements in the apparatus

Lower-middle Darriwilian index conodonts from the Precordillera: new taxonomical approaches

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