Treatise Online no. 43: Part N, Revised, Volume 1, Chapter 16: Origin and early evolution of the Bivalvia

Zongjie, Fang; Sánchez, Teresa M.

doi:10.17161/to.v0i0.4275

Cited by 11 publications

(16 citation statements)

References 43 publications

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“…However, the number of bivalve genera was relatively low during this initial phase of diversification (Fig. 2) (Fang 2006; Fang and Sanchez 2012). This event is unique in that no other major phase of order-level diversification has been recognized at any point in the subsequent evolutionary history of the class.…”

Section: The Phanerozoic History Of the Class Bivalviamentioning

confidence: 99%

The Effect of Taxonomic Corrections on Phanerozoic Generic Richness Trends in Marine Bivalves with a Discussion on the Clade’s Overall History

Mondal

Harries

2015

Paleobiology

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This study uses a comprehensive, revised, and updated global bivalve dataset combining information from two major databases available to study temporal trends in Phanerozoic bivalve richness: the Sepkoski Compendium and the Paleobiology Database. This compilation results in greater taxonomic and stratigraphic coverage than possible with either of the two databases alone. However, there are challenges in directly comparing these two sources due to differences in their taxonomic designations and stratigraphic range information. Moreover, both of these datasets are fraught with a number of taxonomic errors, which can significantly bias the overall richness estimate. Additionally, a substantial number of taxonomic corrections were made before a new Phanerozoic bivalve richness curve was produced. The new generic taxonomic curve is comparable with the trajectory of the Sepkoski’s modern fauna and shows rapid and substantial diversification through the Ordovician, followed by a Paleozoic plateau, a Mesozoic high, and Cenozoic diversification after a small reduction in richness associated with the K/Pg extinction. The steep Cenozoic rise documented in the raw richness curve derived from the new dataset is likely real, and reflects the overall robustness and completeness of the bivalve fossil record.

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Section: The Phanerozoic History Of the Class Bivalviamentioning

confidence: 99%

The Effect of Taxonomic Corrections on Phanerozoic Generic Richness Trends in Marine Bivalves with a Discussion on the Clade’s Overall History

Mondal

Harries

2015

Paleobiology

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“…Indeed, the early radiation of bivalves took place in the shallow siliciclastic shelves of Gondwana and peri‐Gondwana during the Early Ordovician (Cope & Babin ; Babin ). Fang () and Fang & Sánchez () explained the occurrence of early bivalves along the Gondwanan margins and not elsewhere and suggested that Ordovician clades might have diversified from small isolated Cambrian populations in the cold‐to‐temperate waters of Gondwana and peri‐Gondwanan regions.…”

Section: Discussionmentioning

confidence: 99%

Radiation, diversity and environmental expansion of Early Ordovician ostracods: a view from the Southern Hemisphere

Salas

Waisfeld

Muñoz

2019

LET

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Tremadocian–Floian siliciclastic successions in the Argentine Cordillera Oriental are of great interest for the study of early ostracod radiation. Four genera and five species of ostracods have so far been documented in the basin from the Early–Late Tremadocian (Tr2). This contrasts with occurrences from other palaeocontinental areas, where typically only one species is described. Patterns of environmental distribution and ecological approaches of ostracod assemblages were analysed on the basis of richness, Fisher's alpha diversity, relative abundance and occupancy. Ecological patterns remained stable throughout the studied interval, mostly with one genus notably dominant over the others. At the regional scale, dominant taxa occur at a relatively large number of sites, which display high occupancy. The literature data on carbonate successions from the Baltoscandian basin show a similar pattern, with a single taxon dominant over the others in local assemblages and wide regional distribution of these dominants. This ecological pattern would therefore have persisted at least until the Dapingian, independently of the sedimentary regime. Ostracods were already present along the onshore–offshore gradient during the initial stages of radiation, showing a strong preference for deep subtidal settings during Tr2 and then spreading to shallower environments in Tr3 and to deeper ones in the Floian (Fl2–Fl3). A compilation of ostracod diversity data from several regions shows a remarkable increase during the Darriwilian. Based on the regions studied herein, this rise in diversity is decoupled from the environmental expansion of ostracods, as they were already recorded along the onshore–offshore profile early in their history on both siliciclastic and carbonate shelves. The Argentine Cordillera Oriental could be considered as a cradle of diversity, with an important role in the subsequent radiation of the group.

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“…For instance, the clade Bivalvia includes a number of early representatives of Tremadocian-Floian age that lack certain apomorphies defining more derived crown groups. In this respect, it has been suggested that such basal taxa can be classified as plesions, i.e., paraphyletic groups having a number of symplesiomorphic traits but morphologically close to a given higher taxon (Fang and Sánchez, 2012). In the case of brachiopods, as Carlson (2016, p. 421) stated, numerous higher taxa had been thought to represent grade-level taxa, i.e., not clades, and our evidence indicates that this could be the case of strophomenides.…”

Section: Phylogenetic Analysismentioning

confidence: 99%

The strophomenide brachiopodAhtiellaÖpik in the Ordovician of Gondwana and the early history of the plectambonitoids

Benedetto

2018

J. Paleontol.

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The Precordilleran species Ahtiella argentina Benedetto and Herrera, 1986 is redescribed and illustrated and Monorthis coloradoensis Benedetto, 1998b from northwestern Argentina is reassigned to the genus Ahtiella Öpik, 1932. Ahtiella famatiniana new species from volcaniclastic rocks of the Famatina range (western Argentina) and Ahtiella tunaensis new species from the Precordillera basin (Cuyania terrane) are proposed. Paleogeographic and stratigraphic evidence strongly suggests that Ahtiella originated in the Andean region of Gondwana to further migrate to Avalonia, Baltica, and Cuyania. Contrary to previous assumptions, the fossil record from the Famatina volcaniclastic succession suggests that the plectambonitoid Ahtiella famatiniana n. sp. evolved from the hesperonomiid orthoid Monorthis transversa Benedetto, 2003 that always occurs in the underlying strata. Phylogenetic analysis of Ahtiella species shows that A. famatiniana n. sp. and the Peruvian A. zarelae Villas in Gutiérrez-Marco and Villas, 2007 are not only the earliest species of the genus but also are morphologically intermediate between Monorthis Bates, 1968 and the later and more derived species of Ahtiella from Baltica and Cuyania. If, as empirical evidence presented here shows, Ahtiella originated from Monorthis through a series of minor transformations, then the impressive morphological gap between orthides and strophomenides was bridged through short-time cladogenesis events, suggesting that it might not have a definite discontinuity between the species level evolution and the origin of higher taxa (macroevolution).UUID: http://zoobank.org/4b8c5442-ea2c-41b2-97f7-4c0a8b0384a2

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Treatise Online no. 43: Part N, Revised, Volume 1, Chapter 16: Origin and early evolution of the Bivalvia

Cited by 11 publications

References 43 publications

The Effect of Taxonomic Corrections on Phanerozoic Generic Richness Trends in Marine Bivalves with a Discussion on the Clade’s Overall History

The Effect of Taxonomic Corrections on Phanerozoic Generic Richness Trends in Marine Bivalves with a Discussion on the Clade’s Overall History

Radiation, diversity and environmental expansion of Early Ordovician ostracods: a view from the Southern Hemisphere

The strophomenide brachiopodAhtiellaÖpik in the Ordovician of Gondwana and the early history of the plectambonitoids

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