Early Cretaceous Toxasterid Echinoid Heteraster from the high Zagros basin, south of Iran

Yavari, Mazaher; Yazdi, Mehdi; Gahalavand, Hormoz; Shadan, Hossein Kamyabi; Adabi, Mohammad Hossein; Villier, Loïc

doi:10.4267/2042/61883

Cited by 5 publications

(8 citation statements)

References 10 publications

(15 reference statements)

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“…The ambulacra of the illustrated specimen (Taherpour Khalilabad et al, 2011: fig. 2a-c) does not match the patterns encountered in H. delgadoi, and almost all illustrated specimens of Heteraster spp. likely belong to Heteraster renngarteni (Yavari et al, 2016).…”

Section: Heteraster Renngartenimentioning

confidence: 99%

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First Record of Sexual Dimorphism in Toxasterid Echinoid Heteraster from the Early Cretaceous Deposits of the Kopet‐Dagh Basin, NE Iran

Shadan

KHALIL‐ABAD

2023

Acta Geologica Sinica (Eng)

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The paper describes the spatangoid echinoids belonging to Heteraster, which could be found in the Barremian‐Aptian deposits (Tirgan and Sarcheshmeh formations)8 at the Bahman jan‐Bala stratigraphic section in northern flank of the Borouj syncline, situated in eastern Kopet‐Dagh Basin, Northeast of Iran. The aim is to introduce a species of toxasteridae family: Heteraster renngarteni as a sexually dimorphic species. Sexual dimorphism is a common features in echinoids and in this study, for the first time, sexual dimorphism was detected in the toxasteridae family.

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Section: Heteraster Renngartenimentioning

confidence: 99%

“…Heteraster is also a stem group genus of the toxasterid echinoids, which appeared in the Hauterivian and became extinct in the Cenomanian, as reported from the Early Cretaceous of Iran (Gauthier, 1902;Taherpour Khalil-Abad et al, 2011;Vaziri and Arab, 2011;Yavari et al, 2016).…”

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confidence: 98%

First Record of Sexual Dimorphism in Toxasterid Echinoid Heteraster from the Early Cretaceous Deposits of the Kopet‐Dagh Basin, NE Iran

Shadan

KHALIL‐ABAD

2023

Acta Geologica Sinica (Eng)

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“…Family Toxasteridae Lambert, 1920 Remarks.-"Heteraster" texanus does not share an exclusive sister group relationship with Heteraster oblongus (Brongniart, 1821), but the phylogenetic analysis presented herein suggests that they are relatively closely related. Further, the species has traditionally been assigned to Heteraster (e.g., see Villier et al, 2004, Thompson, 2016Yavari et al, 2016). Thus, rather than creating a new monotypic genus, or lumping the species within Washitaster Lambert, 1927, "Heteraster" texanus is assigned to a paraphyletic genus following the within-quotes convention of Wiley (1979).…”

Section: Systematic Paleontologymentioning

confidence: 99%

Phylogeny and biogeography of some Cretaceous spatangoid echinoids with special emphasis on taxa from the Western Interior Seaway

Byrum

Lieberman

2020

J. Paleontol.

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Members of the echinoid order Spatangoida, a highly diverse and abundant marine invertebrate clade, were important denizens of the Cretaceous Western Interior Seaway (WIS), an epicontinental seaway that divided North America in two during an interval of greenhouse conditions between roughly 100 and 65 million years ago. A phylogenetic analysis of spatangoids was conducted using a character matrix of 32 characters from 21 species. Species that occur in the WIS were considered comprehensively, and species from other regions such as South America, Europe, and North Africa were also incorporated into the analysis. Phylogenetic patterns retrieved are largely congruent with preexisting family-level classifications; however, species within several genera, especially Hemiaster and Heteraster, need to be reassigned so that classification better reflects phylogeny. The genera Washitaster and Heteraster are closely related, as are Mecaster, Palhemiaster, and Proraster; Pliotoxaster, Macraster, and Hemiaster; and Micraster and Diplodetus. Biogeographic patterns were also considered using the phylogeny, and several episodes of vicariance and range expansion were identified. These were possibly related to some of the various major episodes of sea-level rise and fall during the Cretaceous. In particular, Valangian–mid-Aptian regressions may have caused vicariance within Heteraster and Washitaster while other early spatangoid vicariance may be related to regressions during the late Aptian–early Cenomanian. Further, vicariance caused by regressions during the mid-Cenomanian–Maastrichtian may have driven diversification within Micraster and Diplodetus. Last, transgressions during the late Aptian–early Cenomanian seem to have spurred prominent range expansions in Mecaster and Hemiaster.

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“…This was coeval to the colonisation of new ecological niches in shallow-water platforms along the margins of the Urgonian facies. Heteraster became much more diverse and widespread during the late Barremian and early and remained the commonest and most diverse spatangoid throughout the Aptian (e.g., Yavari et al, 2016). However, new lineages differentiated in shallow waters by the end of the early Aptian, each with adaptive strategies to improve gas exchangethe earliest members of the Macraster/Douvillaster were structured as follows: schizasterids and some hemiasterids in upper offshore and shoreface environments, and micrasterids in the mid-shelf zone (Saucède and Villier, 2005).…”

Section: Irregular Echinoidsmentioning

confidence: 99%

The rise of a novel, plankton-based marine ecosystem during the Mesozoic: a bottom-up model to explain new higher-tier invertebrate morphotypes

Fraaije¹,

Bakel²,

Jagt³

et al. 2018

BSGM

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Los mayores eventos de radiación de la microbiota que comprende el fitoplancton y zooplankton, con grupos como nanofósiles calcáreos, calpionélidos diatomeas, dinoflagelados, foraminíferos planctónicos y radiolarios, fueron característicos del intervalo de tiempo comprendido entre el Jurásico Tardío (c. 160 Ma) y el Cretácico Tardío (c. 100-66 Ma). Tanto de forma directa como indirecta, dichas radiaciones en la columna de agua marina llevaron a la proliferación de varios grupos bentónicos, tales como los cangrejos infaunales y nadadores, equinoideos irregulares, así como grupos nectónicos tales como los ammonites heteromorfos ancilocerátidos. Para cada grupo de invertebrados estudiado, hemos graficado todos los datos disponibles acerca de su diversidad a través del tiempo. Los histogramas resultantes constituyen la base para nuestro nuevo modelo de "relleno" de los ecosistemas del Mesozoico. El impacto sobre los detritófagos y planctotróficos fue directo a partir del Jurásico Tardío, ya que se dió un incremento de partículas nutritivas provenientes del plankton, de tal forma que la radiación de los cangrejos raninoides infaunales (que comprendía los más complejos carroñeros/detritívoros), estuvo íntimamente ligada a la explosión de (o parte de) su alimento (i.e., meiofauna marina). Durante el Periodo Cretácico, surgieron innovaciones y adaptaciones en torno a cambios en composición faunística. Por ejemplo, hubo una transición en los cangrejos rana (Raninoidia), entre el tipo palaeocorístido (vía el tipo liréidido), hacia el tipo ranínido. Otros cambios coetáneos se han documentado para equinoideos irregulares (i.e., de Toxasteridae, vía Micrasteridae, a Schizasteridae), y para ammonites heteromorfos, de Ancyloceratoidea, vía Turrilitoidea, a Scaphitoidea. Aquí se presenta, por vez primera, un elaborado modelo a detalle, con el fin de explicar el surgimiento y la dispersión en el tiempo, de diferentes grupos de invertebrados, en el rango de los más altos niveles tróficos.

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Early Cretaceous Toxasterid Echinoid Heteraster from the high Zagros basin, south of Iran

Cited by 5 publications

References 10 publications

First Record of Sexual Dimorphism in Toxasterid Echinoid Heteraster from the Early Cretaceous Deposits of the Kopet‐Dagh Basin, NE Iran

First Record of Sexual Dimorphism in Toxasterid Echinoid Heteraster from the Early Cretaceous Deposits of the Kopet‐Dagh Basin, NE Iran

Phylogeny and biogeography of some Cretaceous spatangoid echinoids with special emphasis on taxa from the Western Interior Seaway

The rise of a novel, plankton-based marine ecosystem during the Mesozoic: a bottom-up model to explain new higher-tier invertebrate morphotypes

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