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Sumanta Mallick

Bio: Sumanta Mallick is an academic researcher from Jadavpur University. The author has contributed to research in topics: Mesozoic marine revolution & Extinction (optical mineralogy). The author has an hindex of 7, co-authored 11 publications receiving 135 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the authors reported 148 drilled bivalve specimens of a single species from the Upper Jurassic horizon in western India, the highest number for any taxon ever recorded since Precambrian to Cretaceous.

34 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a new dataset of naticid drilling predations, involving 31,929 gastropod specimens, from the latest Maastrichtian Infratrappean bed in Rajahmundry, southern India.

33 citations

Journal ArticleDOI
31 Jan 2014-PALAIOS
TL;DR: In this paper, the authors found evidence of intense naticid drilling predation on turritelline prey from a TDA which lies below the K-T boundary sections in Rajahmundry, India.
Abstract: Evidence of intense naticid drilling predation occurs on turritelline prey from a turritelline-dominated assemblage (TDA) which lies below the K-T boundary sections in Rajahmundry, India. Previously, it was believed that drilling frequency (DF) on turritelline taxa was low during the Cretaceous. Data from the study area indicates that the Cenozoic level of predation on turritelline taxa already occurred by the Late Cretaceous in the study area. The paleobiogeography of naticid predation is extended from the western world to India, which was located in the southern hemisphere during the Cretaceous. In addition to the high drilling frequency, the Indian fossil record shows that many aspects of naticid behavior; for example, size and site stereotypy, which are characteristic features of Cenozoic predators, were also established by the Late Cretaceous. These data support previous views that the Mesozoic Marine Revolution had minimal influence on morphological change in Late Cretaceous turritelline gastropods and that turritelline gastropods may have developed behavioral and/or physiological antipredatory adaptations. TDAs in general may indicate tremendous fecundity that may act as a buffer against high juvenile mortality due to predation.

20 citations

Journal ArticleDOI
TL;DR: A classificatory scheme to categorize the repaired traces on the basis of intensity of the damage is developed and a model to analyze how the severity of scars can be effectively used to study species’ adaptation against shell breaking causes is provided, by using Mactra violacea as a studied species.
Abstract: Non-lethal shell damage, which is preserved as repair scars on the bivalve shell, can be predatory or non-predatory in origin. When the peeling crabs are the main predatory groups, non-predatory damages are produced by impact from the saltating clasts or by wear and tear during burrowing. In both cases, these repair scars almost look alike, and it is difficult to identify which factor is causally responsible. Because survival of an individual is related to the severity of the shell-break irrespective of the cause, here, we have developed a classificatory scheme to categorize the repaired traces on the basis of intensity of the damage. Moreover, we have provided a model to analyze how the severity of scars can be effectively used to study species’ adaptation against shell breaking causes, by using Mactra violacea as a studied species. Individuals who survive shell breakage may adapt to escalated morphological traits to resist damage in the long term. Subhronil Mondal. School of Geosciences, University of South Florida, 4202 E. Fowler Ave. NES107, Tampa, FL 33620-5250, USA. subhronil.m@gmail.com Subhendu Bardhan. Department of Geological Sciences, Jadavpur University, Kolkata-700032, India. sbardhan12@gmail.com Sumanta Mallick. Department of Geological Sciences, Jadavpur University, Kolkata-700032, India. sumanta.geol87@gmail.com Arindam Roy. Department of Geological Sciences, Jadavpur University, Kolkata-700032, India. addy.geol@gmail.com

14 citations

Journal ArticleDOI
TL;DR: In this paper, Mitra et al. showed that the Turritelline gastropods from the Upper Jurassic Dhosa Oolite Member of the Chari Formation in Kutch, western India are the oldest definite representatives of the family.
Abstract: Turritellid gastropods are important components of many Cretaceous—Recent fossil marine faunas worldwide. Their shell is morphologically simple, making homoplasy widespread and phylogenetic analysis difficult, but fossil and living species can be recognized based on shell characters. For many decades, it has been the consensus that the oldest definite representatives of Turritellidae are from the Lower Cretaceous, and that pre-Cretaceous forms are homeomorphs. Some morphological characters of the present turritelline species resemble those of mathildoids, but many diagnostic characters clearly separate these two groups. We here describe and/or redescribe—based on examination of more than 2600 near complete specimens—four species from the Upper Jurassic Dhosa Oolite Member of the Chari Formation in Kutch, western India, and demonstrate that they are members of Turritellidae, subfamily Turritellinae, on the basis of diagnostic characters including apical sculptural ontogeny (obtained from SEM study), spiral sculpture, and growth line patterns. The four species are in order of abundance, Turritella jadavpuriensis Mitra and Ghosh, 1979; Turritella amitava new species; Turritella jhuraensis Mitra and Ghosh, 1979, and Turritella dhosaensis new species. The turritelline assemblages occur only on the northeastern flank of the Jhura dome (23°24′47.57″N, 69°36′09.26″E). Age of the Dhosa Oolite has recently been confirmed based on multiple ammonite species. All these points indicate that these fossils are the oldest record of the family Turritellidae—by almost 30 million years—in the world.

13 citations


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TL;DR: Empirical studies reveal a more complex dynamic, including positive feedback and an exponential growth phase during recoveries, which is far from a model of refilling ecospace, which must be rebuilt during recovery.
Abstract: Although mass extinctions probably account for the disappearance of less than 5% of all extinct species, the evolutionary opportunities they have created have had a disproportionate effect on the history of life. Theoretical considerations and simulations have suggested that the empty niches created by a mass extinction should refill rapidly after extinction ameliorates. Under logistic models, this biotic rebound should be exponential, slowing as the environmental carrying capacity is approached. Empirical studies reveal a more complex dynamic, including positive feedback and exponential growth phase during recoveries. Far from a model of refilling ecospace, mass extinctions appear to cause a collapse of ecospace, which must be rebuilt during the recovery. Other generalities include the absence of a clear correlation between the magnitude of extinction and the pace of recovery, or the resulting ecological and evolutionary disruption; the presence of a survival interval, with few originations, immediately following an extinction and preceding the recovery phase; and the presence of many lineages which persist through an extinction event only to disappear during the subsequent recovery. Several recoveries encompass numerous missing lineages, groups which are found before the extinction, then later in the recovery, but are missing during the initial survival-recovery phase. The limited biogeographic studies of recoveries suggest considerable variability between regions.

281 citations

Journal ArticleDOI

121 citations

Journal ArticleDOI
TL;DR: A review of the types of paleontological data used to infer predation in the marine fossil record, discuss strengths and limitations of the evidence used to recognize and evaluate predatory activity, assess the influence of environmental gradients on predation patterns, and review fossil evidence for predator behavior and prey defense as mentioned in this paper.

72 citations

Book ChapterDOI
01 Jan 2015
TL;DR: Most ammonoids display a distinctly different morphology when they are adults or subadults, and depending on the taxon, these mature modifications may comprise changes in coiling, changes in ornamentation, and conspicuous changes of the terminal aperture.
Abstract: Most ammonoids display a distinctly different morphology when they are adults or subadults. Depending on the taxon, these mature modifications may comprise changes in coiling, changes in ornamentation, and conspicuous changes of the terminal aperture. These mature modifications permit, at least when a combination of which occurs, to identify adult specimens. Co-occurrence of adult forms with differences in size, ornament strength, and aperture shape led already half a century ago to the conclusion that many ammonoids display dimorphism. The smaller forms are usually dubbed microconchs and the larger ones macroconchs. The degrees of differences between the antidimorphs vary and are more or less characteristic for certain clades. Such dimorphism is also known from Recent cephalopods. According to actualistic comparisons and considerations concerning reproductive biology of Recent cephalopods, it is commonly assumed that the microconchs represented the males and macroconchs the females. This hypothesis still needs verification from soft-tissue preservation.

54 citations