The primary urine is modified when it passes through the parts of the excretory system. Following sense organs are present in prawn to receive different stimuli—tactile organs, olfactory setae, statocyst and eye. So the vision produced by the compound eye is known as mosaic vision (Fig. Each tubule has an inner lining of a single layer of epithelial cell which transforms into spermatozoa. It serves as a chamber in which sperm cells are temporarily stored and transformed into small packets, called spermatophores. Each abdominal segment carries a pair of appendages on its ventral sides. Each antennary artery sends the following branches on its own side: (a) Pericardial branch to supply blood to the pericardial wall. An additional hook-like process, appendix interna is present on the inner sides of the endopodites of 2nd, 3rd, 4th and 5th pleopods. Each testis includes numerous minute tubes, called seminiferous tubules, which remain enclosed within connective tissue. It also includes several sense organs to permit the entry of different messages from outside. Thus, this organ serves double functions—digestion and storage. These arteries instead of forming capillary network open directly within haemocoelomic spaces. The coxa and basis of the protopodite are flattened to become jaws and bear stiff setae on their inner margins (Fig. The urine remains temporarily stored within the bladder and is periodically expelled through renal pore. According to their position and mode of attachment, the gills are of three types: (i) Podobranch—attached with the coxa of the second maxilliped. A cuticular supporting rod and a ridged plate of similar nature, bound the inner and outer sides respectively of each lateral groove. Each appendage is biramous, i.e., two branched, and in spite of their modifications are built up on the same general plan: (1) Lower, double-jointed protopodite containing proximal coxa and distal basis and. A single epithelial cell layer having excretory function lines each tubule. (b) Gastric branch to supply blood to the cardiac stomach. (ii) Arthrobranch—attached with the arthroidal membrane of third maxilliped. Close relatives include crabs, crayfish, and lobsters. The residual part of the food passes within the hind gut. It consists of following structures (Fig. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? Both these parts bear on their ventral surfaces paired appendages, which are specialised for different functions. 18.8). 18.6). The thorax bears three pairs of maxillipeds and five pairs of walking legs (pereiopods). It is found throughout the tropical and subtropical areas of the Indo-Pacific region, from India to Southeast Asia and Northern Australia. TOS4. The swimmerets move like paddle during swimming and look like oars. These are a paired cord, each of which begins from the supraoesophageal ganglion of one side and runs posteriorly along the ventrolateral wall of the cephalothoracic cavity.
The endopodite has become a long many-jointed flagellum and carries numrous tactile setae. (5) Different apertures in cephalothorax: The mouth is a slit-like unpaired and median aperture on the ventral side of the cephalothorax and is situated in between third and fourth segments.
The motor fibres carry instructions from the central nervous system to different parts and the sensory fibres are meant for bringing messages from different corners of the body. The hepatopancreatic or hepatic artery of each side originates from the posterio-median end of the heart and runs transversely to enter within the hepatopancreas. From the posterior end of each testis, a long much-coiled duct, called vas deferens, originates.
Each gill-chamber is thus open ventrally, anteriorly and posteriorly.
In prawn, the first gill is podobranch, second and eighth gills are arthrobranchs and remaining five gills are pleurobranches. Characteristics of Penaeus (Fabricius, 1798), Decapods can be distinguished from other higher crustaceans by examining differences in the.
The digestive system of Prawn consists of (A) Alimentary canal and (B) Digestive glands (Fig. They are marine. The central nervous system runs from anterior to posterior end (Fig.
It is an orange-yellow coloured, loosely arranged bilobed organ which encircles completely the pyloric stomach, part of the intestine and partly the cardiac stomach. The anterior valve is the posterior extension of hastate plate, posterior one is the fold of stomach wall and the two lateral valves are the projections of the guiding ridges. 18.3D) is placed slightly posterior to the mouth. This ganglionic mass is pierced by the sternal artery. It runs obliquely downwards and backwards between the thoracic wall and abdominal flexor muscles towards the fifth walking leg. Eucarida have indirect development (i.e. The green colour is seen in Astacus. Food is procured by the chelate legs and brought near the mouth cavity by following appendages— maxillipeds, maxillulae and maxillae. Habits and habitat : ADVERTISEMENTS: Palaemon or prawn, found in fresh water […] First afferent branchial channel supplies blood to the podobranch and arthrobranchs while the remaining five vessels supply to the five pleurobranchs. This crown-shaped smallest appendage (Fig. A large ventral elongated mass is formed by the fusion of eleven pairs of ganglia.
[6] The presence of BC males inhibits the growth of SMs and delays the metamorphosis of OCs into BCs; an OC will keep growing until it is larger than the largest BC male in its neighbourhood before transforming. 18.15B). From the posterior end of the thoracic ganglionic mass originates ventral nerve cord which runs up to the posterior-most segment. Our mission is to provide an online platform to help students to share notes in Biology. The exopodite is thin and un-jointed but the endopodite has three segments—proximal, middle and distal. These endopodite segments are ischium, merus, carpus, propodus, and dactylus. The legs are moved in harmony and the feelers of the antennae are directed forward to survey the environment. They go through several larval stages before metamorphosing into postlarvae, at which stage they are 0.28–0.39 in (7.1–9.9 mm) long and resemble adults. The body is distinctly divided into two parts— cephalothorax and abdomen. It is the narrow and elongated part of the’ intestine, which begins from the dorsal chamber of pyloric stomach and runs along the mid-dorsal line up to the sixth abdominal segment. What is prawn?
The cellular part of the blood includes only amoeboid leucocytes. Like the shrimp, the prawn does tend to prefer the warmer waters in the tropics but some species of prawn … These processes of both the sides in females unite to form a basket for carrying eggs. The blood can coagulate very rapidly. [6] OC males later may transform into the third and final stage, the "blue claw" (BC) males. This is the aperture through which the alimentary canal opens to the exterior. 18.7D). The inner lining is muscular and has one anterior, two lateral and one posterior folds. Two circumoesophageal connectives are united with it at the anterior end.
The pyloric stomach is much smaller and narrower than cardiac stomach. The fresh specimen is slightly bluish in colour. The subphylum Crustacea contains about 42,000 species belonging to 10 classes. These epipodites being present in the anterior part of the gill-chamber carry out respiratory functions. The exo and endopodite parts of coxa together with basis help in the in-pushing of food. When light is dim, ommatidia work together to form a single but blurred image. From intestine the residual part of the food enters within the rectum and is temporarily stored there for some-time. The gonads are of different shapes and both occupy similar position. In this article we will discuss about Prawn:- 1. It is concerned with the ingestion of food. The dorsal branch sends an optic artery to the eye and then the two dorsal branches of the two antennaries unite with the median ophthalmic artery to run within the rostrum as paired rostral arteries. These are small pointed structures, present in pairs on each lateral side of the carapace and posterior to each eye. The class Malacostraca contains about three-fourths of the known species and includes crayfish, lobsters, shrimps and crabs (Bailey-Brock & Moss, 1992).
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