Biogeography of Kutch Ammonites During the Latest Jurassic (Tithonian) and a Global Paleobiogeograph Overview

Bardhan, Subhendu; Shome, S.; Roy, Pinaki

doi:10.1007/978-1-4020-6806-5_17

Cited by 10 publications

(7 citation statements)

References 37 publications

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“…Moreover, major shifts in ammonoid anatomy through time-for example, with regard to the hyponomic sinus, sutural complexity, and ornament-might also affect the space. Ammonoid collections with excellent stratigraphic and facies control are ideal for study within the Westermann Morphospace, because life mode hypotheses can be rejected or supported with lithologic evidence and paleobiogeographic perspective (Macellari 1986;Batt 1989;Yacobucci 2003;Bardhan et al 2007). Specimens with jaws or gut contents, which Westermann (1996) considered in his interpretations, can be plotted in the morphospace as well.…”

Section: Discussionmentioning

confidence: 99%

Westermann Morphospace displays ammonoid shell shape and hypothetical paleoecology

Ritterbush¹,

Bottjer²

2012

Paleobiology

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The Westermann Morphospace method displays fundamental morphotypes and hypothesized life modes of measured ammonoid fossils in a ternary diagram. It quantitatively describes shell shape, without assumption of theoretical coiling laws, in a single, easy-to-read diagram. This allows direct comparison between data sets presented in Westermann Morphospace, making it an ideal tool to communicate morphology. By linking measured shells to hypothesized life modes, the diagram estimates ecospace occupation of the water column. Application of this new method is demonstrated with Mesozoic data sets from monographs. Temporal variation, intraspecies variation, and ontogenetic variation are considered. This method can address hypothetical ecospace occupation in collections with tight stratigraphic, lithologic, and abundance control, even when taxonomy is in dispute.

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Section: Discussionmentioning

confidence: 99%

Westermann Morphospace displays ammonoid shell shape and hypothetical paleoecology

Ritterbush¹,

Bottjer²

2012

Paleobiology

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“…More recent explorations of diversity patterns, for all cephalopods, show a constant and severe decline in generic richness throughout the Late Jurassic, with diversity reaching a minimum in the Early Cretaceous before beginning to recover (Alroy, 2010b). Regionally, declines in ammonite diversity at the J/K boundary have been reported from South America and Madagascar (although this might instead relate to the opening of the South African seaway between the Tethys and South Pacific oceans; Riccardi, 1991), and from India (Bardhan et al, 1989;Bardhan, Shome & Roy, 2007;Shome & Bardhan, 2009). However, the record from southeast Africa and Australasia over this period is too poor (e.g.…”

Section: (A) Molluscsmentioning

confidence: 99%

Biotic and environmental dynamics through theLateJurassic–EarlyCretaceous transition: evidence for protracted faunal and ecological turnover

et al. 2016

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The Late Jurassic to Early Cretaceous interval represents a time of environmental upheaval and cataclysmic events, combined with disruptions to terrestrial and marine ecosystems. Historically, the Jurassic/Cretaceous (J/K) boundary was classified as one of eight mass extinctions. However, more recent research has largely overturned this view, revealing a much more complex pattern of biotic and abiotic dynamics than has previously been appreciated. Here, we present a synthesis of our current knowledge of Late Jurassic-Early Cretaceous events, focusing particularly on events closest to the J/K boundary. We find evidence for a combination of short-term catastrophic events, large-scale tectonic processes and environmental perturbations, and major clade interactions that led to a seemingly dramatic faunal and ecological turnover in both the marine and terrestrial realms. This is coupled with a great reduction in global biodiversity which might in part be explained by poor sampling. Very few groups appear to have been entirely resilient to this J/K boundary 'event', which hints at a 'cascade model' of ecosystem changes driving faunal dynamics. Within terrestrial ecosystems, larger, more-specialised organisms, such as saurischian dinosaurs, appear to have suffered the most. Medium-sized tetanuran theropods declined, and were replaced by larger-bodied groups, and basal eusauropods were replaced by neosauropod faunas. The ascent of paravian theropods is emphasised by escalated competition with contemporary pterosaur groups, culminating in the explosive radiation of birds, although the timing of this is obfuscated by biases in sampling. Smaller, more ecologically diverse terrestrial non-archosaurs, such as lissamphibians and mammaliaforms, were comparatively resilient to extinctions, instead documenting the origination of many extant groups around the J/K boundary. In the marine realm, extinctions were focused on low-latitude, shallow marine shelf-dwelling faunas, corresponding to a significant eustatic sea-level fall in the latest Jurassic. More mobile and ecologically plastic marine groups, such as ichthyosaurs, survived the boundary relatively unscathed. High rates of extinction and turnover in other macropredaceous marine groups, including plesiosaurs, are accompanied by the origin of most major lineages of extant sharks. Groups which occupied both marine and terrestrial ecosystems, including crocodylomorphs, document a selective extinction in shallow marine forms, whereas turtles appear to have diversified. These patterns suggest that different extinction selectivity and ecological processes were operating between marine and terrestrial ecosystems, which were ultimately important in determining the fates of many key groups, as well as the origins of many major extant lineages. We identify a series of potential abiotic candidates for driving these patterns, including multiple bolide impacts, several episodes of flood basalt eruptions, dramatic climate change, and major disruptions to oceanic systems. The J/K t...

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“…C . lotenoense in the Tithonian of Kachchh and Virgatosphinctes , Blanfordiceras , Spiticeras in the Andes [ 76 , 106 ]. Similarly, Megacucullaea , a bivalve, considered to be endemic to the Indo-Madagascan Province, reached the Andes in the Late Jurassic [ 76 , 104 , 107 ].…”

Section: Discussionmentioning

confidence: 99%

Discovery of the first ichthyosaur from the Jurassic of India: Implications for Gondwanan palaeobiogeography

et al. 2017

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An articulated and partially preserved skeleton of an ichthyosaur was found in the Upper Jurassic (Upper Kimmeridgian) Katrol Formation exposed at a site south of the village Lodai in Kachchh district, Gujarat (western India). Here we present a detailed description and inferred taxonomic relationship of the specimen. The present study revealed that the articulated skeleton belongs to the family Ophthalmosauridae. The new discovery from India further improves the depauperate fossil record of ichthyosaurs from the former Gondwanan continents. Based on the preserved length of the axial skeleton and anterior part of the snout and taking into account the missing parts of the skull and postflexural region, it is suggested that the specimen may represent an adult possibly reaching a length of 5.0–5.5 m. The widespread occurrence of ophthalmosaurids in the Upper Jurassic deposits of western Tethys, Madagascar, South America and India points to possible faunal exchanges between the western Tethys and Gondwanan continents through a southern seaway.

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Biogeography of Kutch Ammonites During the Latest Jurassic (Tithonian) and a Global Paleobiogeograph Overview

Cited by 10 publications

References 37 publications

Westermann Morphospace displays ammonoid shell shape and hypothetical paleoecology

Westermann Morphospace displays ammonoid shell shape and hypothetical paleoecology

Biotic and environmental dynamics through theLateJurassic–EarlyCretaceous transition: evidence for protracted faunal and ecological turnover

Discovery of the first ichthyosaur from the Jurassic of India: Implications for Gondwanan palaeobiogeography

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