New Records of Two Non-native Clam Species (Bivalvia: Cardiidae) from the Coastal Waters of Bangladesh

Abstract

Benthic suspension feeders, such as many marine bivalve molluscs, influence the nutrient and organic cycles of benthic and pelagic systems through their ability to filter a wide size range of particles and deposit organic matters that sink to the bottom. They also play important roles in coastal and marine ecosystems by filtering the water and serving as habitat and prey for a variety of sea life. Due to the increasing trends of environmental contaminations in recent years, many bivalves have been using as a potential biomarker for assessing the worse environment. Moreover, the shell of a bivalve is comprised of calcium carbonate, which may support thousands of calciferous organisms into the water body. Mostly, bivalves inhabit the tropics, as well as temperate and boreal waters, and they can survive and even flourish in extreme environmental conditions like Bangladesh. Nowadays, many bivalve molluscs have been identified as a superior source of bioactive compounds and are using for pharmaceutical and nutraceutical purposes as well as other applications. However, until now, few systematic studies on marine bivalve molluscs have been conducted through which a total of 437 marine and brackish water species were identified and recorded in Bangladesh. But still, our knowledge of taxonomy and systematic on marine molluscs are primitive in the context of the country. Here we report two new species of bivalve molluscs, Parvicardium exiguum and Trachycardium procerum belonging to the family Cardiidae, from the Kutubdia Island of Bangladesh. The study added these two bivalve species, which has not been recorded from the coastal zone of Kutubdia Island during the previous studies. To sum up, studies and survey on taxonomy and systematics in marine bivalves will provide new dimensions for further research about these important marine invertebrates.

Morphological description of two scallops, Chlamys albida (Arnold, 1906) and Volachlamys tranquebaria (Gmelin, 1791) from the coastal waters of the northern Bay of Bengal

“…There is a great diversity of molluscs in the coastal waters of the Bay of Bengal, as well as other plants and animals (Wahab et al 2004;Islam et al 2019), in particular of the coastal island of Sonadia, which has been a focal area for scientific research in recent years. Since molluscs are an appropriate indicator group for local invertebrate biodiversity, most research has focused on their biodiversity and systematics compared to other invertebrates (Gladstone 2002).…”

“…Since molluscs are an appropriate indicator group for local invertebrate biodiversity, most research has focused on their biodiversity and systematics compared to other invertebrates (Gladstone 2002). In the south-eastern region, Commans (1940) first reported on mollusc's species from St. Martin's Island (Hossain et al 2014;Islam et al 2019). Ali and Aziz (1976) described 33 species from the same island.…”