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excretory organs of molluscs are

excretory organs of molluscs are

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

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