Freshwater ostracods (Crustacea: Ostracoda) of the plateaus of the northern Western Ghats, India (original) (raw)
Related papers
2007
Ostracods successfully inhabit almost all types of aquatic environment, from deep oceans to brackish water lagoons, estuaries and even freshwater streams, lakes, etc. The major controlling factors governing ostracod population and distribution in estuarine environments and continental shelf zones are water temperature, salinity and substrate. In this paper, the distribution and ecology of marine ostracoda in relation to the environmental parameters such as temperature, salinity, dissolved oxygen of the bottom waters, organic matter, and CaCO3, along with the sand-silt-clay ratio of sediments from the inner shelf sediment region off Karikkattukuppam (near Chennai), off Rameswaram, off Tuticorn and Andaman Islands is discussed. Additionally, similar studies on the brackish water ostracods from the Adyar estuary, Pitchavaram mangroves and Tamiraparani estuary have also been presented. The work pertaining to the statistical parameters of ostracoda such as carapace/valve ratio, ornamenta...
Ostracod faunal assemblages of the Lameta Formation from its classic localities in Jabalpur Cantonment, Madhya Pradesh, and Nand Dongargaon Basin, Chandrapur District, Maharashtra have been studied for their comparison between the two basins. The sections examined are: Chui Hill, Bara Simla Hill and Chhota Simla Hill in Jabalpur Cantonment and Dongargaon Hill and Pisdura Hill in the Nand-Dongargaon Basin. The Lameta Formation in the two basins has yielded 41 species. Of these, 5 species Paracypretta indica, Cypridopsis ashui, C. huenei, Candona? chuiensis, and Cypridea (Pseudocypridina) jabalpurensis – are new. Thirty species have been assigned to species previously described from the Lameta Formation and the Deccan Inter-trappean beds of central and western peninsular India. Six species are left in open nomenclature. All the ostracod species are described and illustrated and a correlation of the Lameta Formation is undertaken on the basis of the sections studied, and the age and affinity of their ostracods are also discussed.
Journal of Paleolimnology, 2014
A late quaternary ostracod record from the Tso Kar basin (North India) with a note on the distribution of recent species M. Kramer, B. S. Kotlia & B. Wünnemann Your article is protected by copyright and all rights are held exclusively by Springer Science +Business Media Dordrecht. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".
Ostracoda from Ennore creek, Tamil nadu
Micropalaeontological investigation has been carried out, for the first time to study the systematics of Recent Ostracoda from the Ennore Creek, north of Chennai, particularly in the view of the insufficient information on these tiny organisms from the marginal marine environments of the Indian subcontinent. In the creek, 20 sediment samples were collected during February, 2006. All the sediment samples were subjected to standard micropalaeontological techniques and ostracod fauna was retrieved. In the study area, a total of 30 species belonging to 24 genera, 15 families, 2 superfamilies and 2 suborders of Podocopida, have been identified. Of these, four species belong to Platycopa and the rest to Podocopa. An up-to-date synonymy along with remarks on the taxa has been given. All the species are illustrated with Scanning Electron Microscope photographs. From the zoogeographical distribution of the fauna of the study area, it is observed that the assemblage shows close affinity with the Indo-Pacific faunal province.
Contrasting opinions have been expressed by different workers about the palaeo- environments of the Lameta Formation of Jabalpur. Some workers have ascribed a shallow marine/estuarine environment of depositions for its sediments, while others have favoured a non-marine interpretation. The present authors have recently recorded 26 ostracod species from the basal beds of Lameta Formation from three classic localities (i.e., Chui Hill, Bara Simla Hill and Chhota Simla Hill). These are univocally freshwater fauna. Khosla and Sahni (2000) earlier proposed Late Cretaceous Mongolian and Chinese affinities for the ostracod fauna of the Lameta Formation of Jabalpur. Whatley and Bajpai (2006) considered them strongly endemic to India. Our study revealed an African and/or South American zoogeographic affinity. The genera common to these continents are Altanicypris, Neuquenocypris, Paracypretta, Stenocypris and Wolburgiopsis.
Micropalaeontological investigation has been done for the first time to study Recent freshwater Ostracodes from Perumal Eri, Cuddalore District, Tamil Nadu. For this purpose, ten surface sediment samples were collected and these samples have yielded nine species. They belong to the following genera: Cyprinotus, Stenocypris, Candona, Cyclocypris, Ilyocypris and Darwinula), 4 families, 2 superfamilies (Cypridacea and Darwinulacea) of the suborder Podocopa and the order Podocopida. Remarks and update synonymy for all the species are given. The zoogeographic distribution of the fauna reveals that the assemblage is confined to the Oriental Province and few forms are extended to the Ethiopian Province.
IJMS, 2002
To perceive the spatial and temporal distribution and ecology of Recent benthic Ostracoda, 56 inner shelf sediment and 60 bottom water samples were collected from the Bay of Bengal, off Karikkattukuppam, Tamil Nadu, starting from October 1995 to July 1996. Living and total (living + dead) population sizes were determined. Temporally, both living and total population sizes were found to be more during April, followed by July, which may be attributed to high temperature, salinity and dissolved oxygen of the bottom water, high calcium carbonate and low organic matter content of the sediments. The most congenial substrate for better thriving of the fauna was found to be silty-sand. The optimum ecological conditions for the abundance of standing crop of 8 persistent taxa of the study are presented.
Fourteen surface and two core sediment samples were collected from the backwaters of Cochin, Kerala, southwest coast of India, in order to study the systematics and distribution of Recent Ostracoda. The ostracod taxa were separated from the sediments applying standard micropaleontological techniques. A total of 20 Ostracod species belonging to 17 genera and 8 families were identified. Sediment parameters such as CaCO3, organic matter and sand-silt-clay ratio were estimated for the surface as well as core samples in order to determine the relationship between substrate and Ostracoda populations, and to evaluate the favoured substrate of dominant species populations. The down core distribution of sediment parameters and ostracod assemblages is presented. Based on this data we determine that ostracods favour silty-sandy substrate environments. The rate of sedimentation was determined based on the ratio between the carapace and open valves of Ostracoda. The benthic ostracod fauna recorded is characteristic of a tropical, brackish to epi-neritic environment and few warm, shallow marine species occur in the backwaters of Cochin, may be due to the tidal influence.