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

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