Evolutionary Trends within Jurassic Ammonoids

Neige, Pascal; Rouget, Isabelle

doi:10.1007/978-94-017-9633-0_3

Cited by 4 publications

(3 citation statements)

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“…Published studies on species richness fluctuations for ammonoids and covering the period studied here are astonishingly scarce (see Neige & Rouget (2015) for a review). They generally focus on restricted palaeogeographical zones (e.g.…”

Section: Discussionmentioning

confidence: 99%

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Ups and downs of belemnite diversity in the Early Jurassic of Western Tethys

2021

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Although belemnites form a major clade of extinct cephalopods, the early stage of their diversification remains poorly known in time and space. Here we investigate the first diversification episodes of belemnites (order Belemnitida) using a new species‐level database encompassing the Hettangian–Aalenian interval (Early Jurassic – earliest Middle Jurassic) and covering the Western Tethys. Rarefied richness shows a four‐fold increase from the Planorbis chronozone to the Ibex chronozone, a strong decrease between the Margaritatus and Spinatum chronozones, followed by a drop in the Spinatum–Serpentinum interval that is coeval with the second‐order Toarcian biological crisis. The Bifrons chronozone records a high richness that departs significantly from those of the surrounding chronozones. A last richness peak in the Dispansum chronozone precedes a decrease towards the Aalenian. Biogeographical analyses do not reveal any clear large‐scale provincialism for belemnites, in sharp contrast with ammonoids. Such a long‐term homogeneous spatial distribution of belemnites is probably due to: (1) the relatively poorly‐documented fossil record of belemnites, especially in Mediterranean localities; and (2) contrasted dispersal abilities of belemnites compared to ammonoids over the studied time interval.

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Section: Discussionmentioning

confidence: 99%

“…Interestingly, this radiation occurred at the same time and in the same area as one for ammonoids, as shown by Dommergues et al . (1996) and Neige & Rouget (2015).…”

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confidence: 99%

Ups and downs of belemnite diversity in the Early Jurassic of Western Tethys

2021

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“…There were mass extinction events at the end of the Permian and Triassic when drastic taxonomic turnovers of ammonoid fauna occurred (e.g., House, 1988 ; Monnet, Brayard & Brosse, 2015 ; Brayard & Bucher, 2015 ; Longridge & Smith, 2015 ). In the Early Triassic and Early Jurassic, origination rates of ammonoids were high (Ceratitida originated in the Triassic and Lytoceratina and Ammonitina originated in the Jurassic; Neige & Rouget, 2015 ; Yacobucci, 2015 ; Longridge & Smith, 2015 ), which probably indicate radiations into open niche followed mass extinction events. At these times, ammonoids appear to have originated and resulted in an increased diversity rather than an increased geographical spread of each taxa (with the exception of some long-ranged taxa).…”

Section: Discussionmentioning

confidence: 99%

Geological duration of ammonoids controlled their geographical range of fossil distribution

Wani

2017

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The latitudinal distributions in Devonian–Cretaceous ammonoids were analyzed at the genus level, and were compared with the hatchling sizes (i.e., ammonitella diameters) and the geological durations. The results show that (1) length of temporal ranges of ammonoids effected broader ranges of fossil distribution and paleobiogeography of ammonoids, and (2) the hatchling size was not related to the geographical range of fossil distribution of ammonoids. Reducing the influence of geological duration in this analysis implies that hatchling size was one of the controlling factors that determined the distribution of ammonoid habitats at any given period in time: ammonoids with smaller hatchling sizes tended to have broader ammonoid habitat ranges. These relationships were somewhat blurred in the Devonian, Carboniferous, Triassic, and Jurassic, which is possibly due to (1) the course of development of a reproductive strategy with smaller hatchling sizes in the Devonian and (2) the high origination rates after the mass extinction events.

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