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Nov 28

ctenidia) or molluscan gill consists of a long flattened axis hangs from the anterior wall of the mantle cavity. It is located in the chest and abdominal region. The excretory functions are carried by specialised organ called kidney. These are multicellular organisms. (8) Molluscs : They have one or two pairs of kidneys or organs of bojanus and keber's organ for excretion in unio. This gland is found in annelids, arthropods and molluscs. The organ removes nitrogenous waste … Molluscan excretion takes place by the kidney (organ of Bojanus) & Keber’s organ. This opening is funnel shaped and contains cilia. It includes about 100,000 living species. Water, minerals, and other substances go through the nephidrium to filter the It is a long coiled Another vital part of the snail's excretory anatomy is the haemolymph, or heart sac. takes place by – 1. The nervous system includes well-developed ganglia, commissures and connectives. Molluscs (Mollusca) are a group of invertebrates that includes squid, octopuses, cuttlefish, nudibranchs, snails, slugs, limpets, sea hares, mussels, clams, oysters, scallops, as well as many less well-known animals. 1. These are the comb-like outgrowths of the mantle and are located within the mantle cavity. The phylum Mollusca is a large phylum of invertebrate animals. Ctenidium — as the Respiratory Organ: Aquatic molluscs respire through ctenidia. 23% of phylum are marine organisms. Certain sensory organs are also pre­sent. Of all molluscs, the snails have adapted to the most habitats, which has led to their amounting to the by far highest number of mollusc species. Eg. These are soft bodied animals. there are so many organs responsible for excretion located in different places in the body. Snails, Clams, Oyster etc. Adaptation to so many different habitats only way possibly by optimally adapting organs and organ systems. A pair of organ of Bojanus & 2. The organ is necessary to maintain fluid balance within snails. Scientists estimate that there are more than 100,000 species of molluscs alive today. There are different types of excretory organs in different organisms. A metanephridium is a type of excretory gland. Organ of Bojanus:- Kidneys of bivalves are called organ of Bojanus after the name of the discoverer. A metanephridium consists of an opening into the body cavity. phylum Mollusca is divided into 7 classes. or Lamellidens sp. The system is not located in a particular position. The phylum includes both monoecious and dioecious forms. Keber’s organ or pericardial gland. Excretion in Unio sp. Alone from external appearance, two gastropod species may sometimes be hard to recognise as two of the same class, Gastropoda. The liver. The kidney in bivalvian molluscs is known as organ of Bojanus. The organs in the excretory system? In aquatic molluscs the gills are the respiratory organs, but in terrestrial forms there are lung-like structures for respiration. Structure: Each ctenidium (pl. (9) Echinoderms : Specialized excretory organs are absent in echinoderms (e.g., Starfish). This is connected to a duct which opens to the exterior.

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