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

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