The bladder occupies the innermost re­gion and is drawn into a narrow tube to open to the exterior through the renal aper­ture on the inner side of the coxa. Thus the appendages of Prawn are helpful in food collection, respiration and locomotion. A biramous appendage is one that has two branches. Reproductive System 10. The antennules (or first antennae) are generally regarded as true appendages, although they differ from all the other appendages in the facts that they are always innervated from the "brain" (or preoral ganglia) and that they are uniramous in the earliest and in the adults of all sub-classes except the Malacostraca, where they are biramous or sometimes triramous. Most aquatic, two pairs of antennae, biramous appendages, 2 tagmata, cephalothorax, abdomen, three pairs of feeding appendages (Class Branchiopoda, Ostracoda, Maxillopoda, Malacostraca) Class Branchiopoda. The cephalothoracic region is covered by a carapace, k produces anteriorly a rostral spine. A pair of stalked compound eyes are present near the base of the rostrum. 2. The last pair of abdominal limbs is frequently different from the others and is called the uropod s. Endite: Lobe of several proximal podomeres of various appendages. supraoesophageal gan­glia is formed by the fusion of several pairs of ganglia. (Fig. Ø Basic parts of appendages are protopodite, exopodite and endopodite. Cephalothorax is consist of head and thorax. The first gill is smallest and the last one the largest. In the first and second pairs of legs the propodus is prolonged beyond its articulation with dactylus and it looks like a chela or pincer. The digestive system consists of an alimentary canal and a hepatopancreas or digestive gland (Fig. They are tactile. 3. Thirteen pairs of appen­dages are present on the ventral side of prawn. The mandibular process shows 5 or 6 dental plates. Welcome to NotesOnZoology.com! 25.6) resembling the head of a spear in the mid-ventral region. A uniramous limb comprises a single series of segments attached end-to-end. These are called pleopods or swimmerts. The undigested food is moved to the intestine, where certain amount of digestion and absorption take place. Marine water prawn is called Penacus'. A biramous limb, however, branches into two, and each branch consists of a series of segments attached end-to-end. The respiratory pigment is proteidhaemocyanin. A two-jointed shaft, proximally at­tached to the integument by a flexible mem­brane. 1. The slightly convex upper part of the hastate plate gradually slopes laterally, form­ing a median ridge in the middle. The female reproductive system con­sist of a pair of ovaries, a pair of oviducts and a pair of female gonopores (Fig 25.15B). A small, anteroposteriorly compressed chamber, next to mouth, bear­ing irregular internal folds. Maxillipeds, maxillulae and maxillae help in tearing it into pieces. The common examples for crustaceans include prawns, lobsters, shrimps, barnacles, and crabs. Epigastric Tooth: Tooth on the carapace situated above the gastric region behind the first (posteriormost) rostral tooth. A female brine shrimp, Artemia franciscana, viewed from the left. Thoracopod setae omitted for clarity. It is lodged in a special haemocoel, the pericar­dial cavity, the walls of which form the pericardium. It is helpful for respiration and manipulation of food. 2. The appendages are two pairs of anten­nae, one pair of jaws, two pairs of max­illae, three pairs of maxillipeds and five pairs of pereopods or walking legs. Biramous appendages are nineteen pairs; five pairs in the head, eight pairs in the thorax and six pairs in the abdomen. The lining membrane of the branchiostegite and the epipodites of the three maxillipeds are highly vascular and aid in the process of respiration. The protopodite bears a three-jointed leg-like endopodite and a slen­der un-jointed exopodite. The two sinuses are connected with each other at several places. One of the biramous paired appendages typically arising ventrally from each of the anterior five abdominal somites. Stalked eyes and biramous antennule (first antenna) are adaptations of mobile shrimp. Behind the eyes, the arteries of the two sides anastomose and form a loop, the circulas cephalicus, with which the median ophthalmic artery joins. Sensory setae are arranged in the sac in the form of an oval ring. Before giving off the optic artery, the antennary artery sends a common artery, which divides into renal, antennal and antennular branches and sup­ply the respective organs. In prawn, two types of visions are found. 4. The food is captured by the chelate legs and brought to the mouth. The prawn bears two compound eyes. On the basis 2 long,many segmented whip like feelers are present. The sternal artery is a large vessel. In female the 3rd walking leg bears a female reproductive opening on the inner side of coxa. 1). The appendages are typically biramous (= twobranched). Pleopod:One of the biramous paired appendages typically arising ventrally from each of the anterior five abdominal somites. The renal sac is a thin-walled median structure lying just above the stomach. A biramous limb typically has a basal part, or protopodite, bearing two branches, an inner endopodite and an outer exopodite. The endopodite has ischium, merus, carpus, propodus and dactylus. A statocyst is a sub-spherical cuticular sac (Fig. Statocysts are the balance organs. a. Antenna: The protopodite shows coxa and basis. The first two pairs are chelate. Such an image is known as apposi­tion image. Visualization and feature extraction of the surface morphology of the abdomen of red swamp crayfish Thorax and abdomen have a pair of biramous appendages in each segment. The fresh water prawn Macro brachium (former Palaemon) belongs to subclass Branchiopoda, class Crustacea, phylum Arthropoda. b. There are thousands of terrestrial species in this phylum, and a large, predominately aquatic subphylum, the Crustacea. 4. External Features of Prawn 2. 1. 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 antennary gland—also called green gland—is placed in the coxa of the second antenna. iii. Each appendage has a two-jointed basal region called protopodite to which are attached two distal processes, the outer exopodite and the inner endopodite. Project Name: e-Content for zoology experiments Project Investigator: Dr. Nikunj Bhatt Module Name: Prawn: appendages Ø Total appendages 19 pairs, of which 5 cephalic, 8 thoracic, 6 abdominal. The comb plates join at the anterior end but remain free posteriorly, close to the cardio- pyloric opening. 1. (ii) Class insecta : Hexapod arthropods with a pair of antennae and three pairs of jaws.Example : cockroach, grasshopper, bees, housefly etc. Appendages are externally projected parts of the body in the formation of which vari­ous systems of the body take part. It is connected with each antennary gland by a narrow duct anteriorly. 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. 3.7 Prawn Rostrum Eye Cephalothorax Abdomen Telson Antenna 21 Exercise 3 (viii) At the end of the last abdominal segment, a terminally pointed structure, telson , is present. In a uropod the coxa and basis fuse together to form a triangular sympod. Planktonic, coxa of trunk appendages provided with gills (Order Diplostraca, Anostraca) Order Diplostraca. The protopodite has coxa and basis. 2. The supraintestinal artery runs up to the posterior tip of the abdomen lying dorsal to the alimentary canal. Two stout nerve cords, arise from the hinder part of the supraoesophageal ganglia and rim backward and downward round the oesophagus to meet ventrally in the thoracic ganglionic mass. On the outer margin of the head a mandibular palp is present, which represents the basis and endopodite. The mouth is a slit-like aperture situated on the ventral surface of the head. The cephalic region contains 5 segments and thoracic region contains 8 segments. The genus is widely distributed in tropical and temperate countries (Fig. Arises from the anterior part of the supraoesophageal gan­glion, runs forward and sends branches to the antennule and the statocyst of the side. A large gan­glion formed by the fusion of several pairs of ganglia and form the anterior-most gan­glion of the ventral nerve cord. Cephalic Appendages (Fig. For aeration, haemolymph from the ven­tral sinuses is sent through six pairs of affer­ent branchial channels to the gills. • The appendages of the successive segments closely correspond in Structure and development The appendages of prawn Are biramous (Each of them has two process Or rami arising basal portion called protapodite) and Segmentented • The two process are outer exopodite and inner endopodite • Their segments are called podomeres • Protopodite is typically 2 segmented Its two … The laterals are connected with each other by transverse channels and also with the median canal by marginal channels. They are a pair, one in each antennule, located in the cavity of the precoxa or the basal segment. The male reproductive system consist of a pair of testes, a pair of vasa deferentia, a pair of seminal vesicles and a pair of gonopores (Fig 25.15A). Any ray of light strik­ing obliquely on the sides of the omma­tidium passes to the next and, in doing so, becomes refracted to reach the next omma­tidium. The basal part of coxa is divided into two parts, it shows a mandibular and incisor process. Two delicate connectives join the ante­rior visceral ganglion with the two commis­sural ganglia on the circumaoesophageal connectives. i. In the prawns, they are primarily swimming organs (Fig. Leaf-like protopodite with a whip-like exopodite and a slender endopodite. Each segment may possess one pair of appendages, although in various groups these may be reduced or missing. The central nervous system consists of a pair of supraoesophageal ganglia, a pair of circumoesophageal connectives, a sub-oesophageal or thoracic ganglionic mass and a double ventral ganglionated nerve cord. 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