Aequiloboidea: A new Early Jurassic ammonite superfamily of the Mediterranean Tethys

Bilotta, Massimiliano

doi:10.1016/j.geobios.2010.05.002

Cited by 2 publications

(4 citation statements)

References 17 publications

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“…The Triassic phylloceratid superfamily Ussuritoidea is ancestral to the Early Jurassic phylloceratid superfamily Phylloceratoidea, although Pálfy and Dosztály (2000) have reported a very early occurrence of the Phylloceratoidea in the Rhaetian of Hungary. In addition, Bilotta (2010) speculates that the geographically restricted Aequiloboidea also had its origin in the latest Triassic but this is not proven and, anyway, the superfamily does not play a major role in the Early Jurassic radiation. Tozer (1981) and Page (2008) using data from Bilotta (2010), Hoffmann (2010), Howarth (2013), andTozer (1994) Of the nine superfamilies ranging upward from the Middle into the Late Triassic ( Fig.…”

Section: Taxonomic Turnovermentioning

confidence: 99%

“…In addition, Bilotta (2010) speculates that the geographically restricted Aequiloboidea also had its origin in the latest Triassic but this is not proven and, anyway, the superfamily does not play a major role in the Early Jurassic radiation. Tozer (1981) and Page (2008) using data from Bilotta (2010), Hoffmann (2010), Howarth (2013), andTozer (1994) Of the nine superfamilies ranging upward from the Middle into the Late Triassic ( Fig. 18.1), four are restricted to the Carnian with the Clydonitoidea ranging into the Norian and four ranging into the Rhaetian (Arcestoidea, Megaphyllitoidea, Pinacoceratoidea, Ussuritoidea).…”

Section: Taxonomic Turnovermentioning

confidence: 99%

“…The superfamilies are based primarily on the approaches of Tozer (1981Tozer ( , 1994 for the Triassic and Page (2008) and Venturi and Bilotta (2008) for the Jurassic. A geographically restricted superfamily, the Aequiloboidea has recently been recognized by Bilotta (2010). We include the Analytoceratoidea in the Lytoceratoidea following the work of Hoffman (2010).…”

Section: Taxonomic Turnovermentioning

confidence: 99%

“…The asymmetry is prevalent in many Hettangian genera including Neophyllites, Psiloceras, Euphyllites, Eolytoceras, Caloceras, Alsatites, Sunrisites, Badouxia, Kammerkarites, Franziceras, Discamphiceras, Paradiscamphiceras, Kammerkaroceras, Curviceras and Storthoceras (Bilotta 2010;Bloos 1981Bloos , 1994Bloos , 1996Bloos , 1999Bloos and Page 2000;Böhm et al 1999;Canavari 1882;Frebold 1951Frebold , 1967Guérin-Franiatte 1990;Guex 1989Guex , 1995Guex and Rakús 1991;Hengsbach 1986a, b;Hillebrandt 2000a-c;Hillebrandt and Krystyn 2009;Lange 1941Lange , 1952Longridge et al 2006Longridge et al , 2008aNeumayr 1879;Rakús 1993b;Schlegelmilch 1976;Spath 1919Spath , 1924Taylor 1988;Wähner 1882Wähner -1898Wiedmann 1970;Yin et al 2007). Asymmetry is also recognized in some younger Early Jurassic genera such as Arctoasteroceras, Aequilobus and Dudresnayiceras in the Sinemurian, and Sinuiceras in the Pliensbachian (Bilotta 2010;Frebold 1960). We suspect that with close observation, the phenomenon will be discovered in additional Jurassic genera.…”

Section: Siphuncle Offset and Septal Face Asymmetrymentioning

confidence: 99%

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Ammonoids at the Triassic-Jurassic Transition: Pulling Back from the Edge of Extinction

Longridge

Smith

2015

Topics in Geobiology

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The mass extinction at the end of the Triassic is one of the "big five" extinctions in the Phanerozoic and one of four that directly affected the evolutionary history of the ammonoids. At the Triassic-Jurassic (T-J) transition, approximately 22 % of marine families, 53 % of genera and 80 % of species became extinct (Pálfy 2003;Sepkoski 1996) but the event is of particular significance to the ammonoids because of their near demise. Left hanging by a thread, the group managed to pull back from the brink of extinction and, in spectacular fashion, re-establish itself as a dominant presence throughout the rest of the Mesozoic. As a result of the exceptionally low eustatic sea-level at the time, a situation that almost certainly contributed to the dynamics and severity of the extinction, there are only a very small number of marine stratigraphic sections that are reasonably continuous across the T-J boundary. The list includes an exposure in Austria that was recently designated Global Stratotype Section and Point for the base of the Jurassic (Hillebrandt et al. 2013). Studying the precise details of the T-J event horizon is therefore difficult, but a clear picture of the scale of the ammonoid near extinction and a sense of the dynamics of recovery can be obtained by considering high level taxonomic changes, broad patterns of generic diversity and differences in morphospace occupation across the entire Late Triassic to Middle Jurassic interval. This is the purpose of our brief review.Interpreted environmental changes over the T-J interval include initial cooling, longer term global warming, widespread aridification, a global regression/transgression couplet, oceanic anoxia and a biocalcification crisis brought on by lower seawater pH

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Section: Taxonomic Turnovermentioning

confidence: 99%

Section: Taxonomic Turnovermentioning

confidence: 99%

Section: Taxonomic Turnovermentioning

confidence: 99%

Section: Siphuncle Offset and Septal Face Asymmetrymentioning

confidence: 99%

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Ammonoids at the Triassic-Jurassic Transition: Pulling Back from the Edge of Extinction

Longridge

Smith

2015

Topics in Geobiology

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Deep-Time Phylogenetic Clustering of Extinctions in an Evolutionarily Dynamic Clade (Early Jurassic Ammonites)

et al. 2012

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Conservation biologists and palaeontologists are increasingly investigating the phylogenetic distribution of extinctions and its evolutionary consequences. However, the dearth of palaeontological studies on that subject and the lack of methodological consensus hamper our understanding of that major evolutionary phenomenon. Here we address this issue by (i) reviewing the approaches used to quantify the phylogenetic selectivity of extinctions and extinction risks; (ii) investigating with a high-resolution dataset whether extinctions and survivals were phylogenetically clustered among early Pliensbachian (Early Jurassic) ammonites; (iii) exploring the phylogenetic and temporal maintenance of this signal. We found that ammonite extinctions were significantly clumped phylogenetically, a pattern that prevailed throughout the 6.6 Myr-long early Pliensbachian interval. Such a phylogenetic conservatism did not alter – or may even have promoted – the evolutionary success of this major cephalopod clade. However, the comparison of phylogenetic autocorrelation among studies remains problematic because the notion of phylogenetic conservatism is scale-dependent and the intensity of the signal is sensitive to temporal resolution. We recommend a combined use of Moran's I, Pearson's ϕ and Fritz and Purvis' D statistics because they highlight different facets of the phylogenetic pattern of extinctions and/or survivals.

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Aequiloboidea: A new Early Jurassic ammonite superfamily of the Mediterranean Tethys

Cited by 2 publications

References 17 publications

Ammonoids at the Triassic-Jurassic Transition: Pulling Back from the Edge of Extinction

Ammonoids at the Triassic-Jurassic Transition: Pulling Back from the Edge of Extinction

Deep-Time Phylogenetic Clustering of Extinctions in an Evolutionarily Dynamic Clade (Early Jurassic Ammonites)

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