First record of the heart urchin Metalia persica (Mortensen, 1940) (Spatangoida: Brissidae) from the Chennai coast, India

Kanagaraj, Chamundeeswari, Mooi, Rich, Kumar, Deepak Samuel Vijay, Premachandran, Hrishikesh, Rajendran, Abhilash Kottarathil, Rethinavelu, Sankar, Ramachandran, Purvaja, Ramachandran, Ramesh (2019): First record of the heart urchin Metalia persica (Mortensen, 1940) (Spatangoida: Brissidae) from the Chennai coast, India. Zootaxa 4624 (2): 296-300, DOI: 10.11646/zootaxa.4624.2.1

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Not AvailableOur study reports the occurrence of devil snail, Faunus ater from a mangrove habitat of Sindhudurg District, Maharashtra, India. The density of the aggregation of devil snail in the study area ranged from 100 to 640/m2. Out of the 46 mangrove patches surveyed, this species was observed only in Aadbandar. Significantly, this study provides baseline information regarding the abundance and distribution of devil snail from the Indian subcontinent

Limited distribution of Devil snail <em>Faunus ater</em> (Linnaeus, 1758) in tropical mangrove habitats of India

2002-2007Our study reports the occurrence of devil snail, Faunus ater from a mangrove habitat of Sindhudurg District, Maharashtra, India. The density of the aggregation of devil snail in the study area ranged from 100 to 640/m2. Out of the 46 mangrove patches surveyed, this species was observed only in Aadbandar. Significantly, this study provides baseline information regarding the abundance and distribution of devil snail from the Indian subcontinent

Hydrographical parameters and phytoplankton assemblages along the Pondicherry–Nagapattinam coastal waters, southeast coast of India

Hydrographical parameters and phytoplankton assemblages were determined along the Pondicherry, Parangipettai and Nagapattinam coastal waters, southeast coast of India. All the hydrographical parameters such as sea surface temperature, salinity, pH, total alkalinity, dissolved oxygen and nutrients like nitrate, nitrite, inorganic phosphate and reactive silicate, chlorophyll a and phytoplankton assemblages were studied for a period of five months (May, August, September 2010, March and November 2011). Over 121 species of phytoplankton represented by 93 species of diatoms, 16 species of dinoflagellates, 9 species of blue-green algae, 2 species of greens and 1 species of silicoflagellate were recorded. High phytoplankton species diversity was found in March 2011 when salinity and nitrate concentrations were low and reactive silicate and inorganic phosphates were moderate. Species diversity was low during May 2010 when increased sea surface temperature, salinity and low nutrients availability were observed. Coscinodiscus centralis, Diatoma vulgaris and Proboscia alata were dominant, especially Coscinodiscus sp. distributed in all stations whereas Skeletonema costatum, Odontella sinensis and Ditylum brightwellii were abundant in August and September 2010. From principal component analysis and multiple regression analysis, it is evident that variables like sea surface temperature and dissolved oxygen are the most important factors influencing the seasonal pattern of phytoplankton population