13 pairs of paired, biramous appendages are present in the cephalothorax. 2. With stretched pleopods and uropod the abdomen suddenly moves forward towards the cephalothorax and the animal swiftly moves backward with a jerk due to the sudden thrust. There are six pairs of abdominal appendages called pleopods or swimmerets which help the prawn in swimming. II Maxillae: The protopodite is fait and is divided into 4 lobes. Each antennary artery on its way gives off a pericardial branch to the pericardium, a gastric branch to the cardiac stomach, a mandibular branch to the mandibular muscles, and finally an optic artery supplying the eye of the side. Development direct, the newly hatched young resembling the adult, leave the abdominal basket to lead a free life. III Maxillipede : It looks like a walking leg. Respiratory System 6. The body is elongated and divisible into an anterior cephalothorax and a posterior abdomen. The next 8 pairs are Thoracic appendages. Two small visceral or oesophageal ganglia are present on the roof of the cardiac stomach, one behind the other. Exopodite is absent. The digestive system consists of an alimentary canal and a hepatopancreas or digestive gland (Fig. They are tactile. Basically, each biramus appendage consists of a common base protopodite, bearing two ramian, inner endopodite and outer exopodite. Each segment is enclosed in a hard cuticle divisible into a dorsal, convex tergum a pair of lateral pleurons and a ventral sternum. The endopodite has ischium, merus, carpus, propodus and dactylus. Disclaimer Copyright, Zoology Notes | Exclusive Notes on Zoology for Students, Earthworm: Digestive and Reproductive System | Zoology, Invertebrate Nervous System (With Diagram) | Zoology, Respiration in Prawn | Crustacean Anthrapods, Essay on Earthworm: Feeding and Digestion. Enzymes secreted by the hepatopancreas digest proteins, carbohydrates and fats. Welcome to NotesOnZoology.com! The body of Giant river prawn (Macrobrachium rosenbergii) is divided into two large parts such as cephalothorax and abdomen. Change of place in prawn takes place in three ways: The body is kept straight in a horizontal position. The optic nerve breaks up into branches and innervate the retinular cells. Ø Total appendages 19 pairs, of which 5 cephalic, 8 thoracic, 6 abdominal. The blood of arthropods contain 87 to 98 per cent of water, and mainly 3 types of blood corpuscles are found; viz.—amoebocytes, granulocytes and thrombocytes. From this loop comes off a rostral artery on each side. The thick chitinous layer of the integument is a nitrogenous product secreted by the ectoderm and is cast off in each moult. Cephalothorax is made by 13 segments which includes cephalic and thoracic regions. a. The body of Prawn is elongated, hemispherical and slightly tapering at the posterior end. The basal part of the ommatidium is made of spindle-shaped, transversely striated structure, the rhabdome, which is surrounded by seven elongated cells, the retinular cells. In the simplest condition, each segment of a crustacean posesses one pair of biramous appendages (see image, left). All the crustaceans are exclusively aquatic and found in both freshwater and saltwater habitats. LEARN MORE ABOUT THE APPENDAGES OF PRAWN Get link; Facebook; Twitter; Pinterest; Email; Other Apps - April 07, 2020 APPENDAGES OF CEPHALOTHORAX: (a) First antenna: First antenna is also known as antennule . i. In a uropod the coxa and basis fuse together to form a triangular sympod. 4. They are not homologous to exopodite and endopodite. How many main branches do crustacean appendages have? Typically, the basal protopodite is bisegmented, proximal coxa for attachment with the body […] At the base of the coxa renal opening is present. Project Name: e-Content for zoology experiments Project Investigator: Dr. Nikunj Bhatt Module Name: Prawn: appendages 2. Indian River water prawn is called Palaemon'. c. A hastate plate (Fig. A hollow base or shaft connected to the appendage. A circular plate anteriorly, just behind the oesophagus. The gill is attached to the body about the middle of its length, and is highly vascular. The close apposition of these appendages speaks about the fusion of cephalothoracic segments. The basis bears two flat leaf like exo and endopodite. External Features of Prawn 2. The testes are soft, white, elongated bodies, fused at both the ends and are situated in the cephalothorax, below the heart and above the hepatopancreas. The size is variable, the average being 15 to 20 cm. 3. The proximal group surrounding the retinula constitute the retinal sheath. Beneath the corneal facet is a pair of flat corneagen cells of epidermal origin which secrete a new cornea when the old one is lost during moulting. The respiratory pigment is proteidhaemocyanin. 2. A small nerve arising from the posterior border of the brain connects the two ganglia behind. Crustacean biramous appendages have a basal or first portion referred to as the protopod. Part or all. A loop embracing the oesophagus posteriorly and connects the two circumoesophageal connectives. For aeration, haemolymph from the ventral sinuses is sent through six pairs of afferent branchial channels to the gills. There are six abdominal ganglia on the nerve cord corresponding to the six abdominal segments. Gaseous exchange takes place in the gill filaments. It is a bilobed structure formed by the fusion of the right and left ganglia and is situated beneath the base of the rostrum just in front of the junction of the oesophagus with the cardiac stomach. 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