Similarities And Differences Between Platyhelminthes And Roundworms

Introduction:
In this essay I will talk about two kinds of organisms that are called worms. That's organisms use it in a labs. Which are the flatworm and the roundworms. However, every kind belongs to different phylum, so they are not closely related to each other. Flatworms ( phylum Platyhelminthes) and roundworms ( phylum Nematoda), but there are many similarities and differences between these two types of organisms.

Similarity:
• There are many similarities between the two groups of worms, Platyhelminthes and Nematoda. There are true animals and have all characteristic that Classified as Eumetazoa .Both flatworms and roundworms have bilateral symmetry that means the right section of body similar to left section of body with head. These
Firstly, a flatworm has a thin and flattened body shape. While the Roundworms are more cylindrical in shape and tapered to a fine point at one end and they are not segmented worms but flatworms have segmented bodies that each segment is called a proglottid. In addition, Roundworms have a tough collagen covers body called a cuticle that they must repeatedly shed as they grow while Flatworms do not have a cuticle and often have cilia on the surface of their bodies. The Flatworms are more than 20,000 species collectively whereas appreciation that nematode species are about one million and they have been completed descriptions from 28,000 species. Flatworms are generally larger compared to roundworms in their body size. The largest member of the flatworms is about five centimeters long, but the average length is about 2.5 millimeters while nematoda don’t can see it with eyes because these organs are very small and length ranges from 0.3 to 1 m and a few of the species reach a length of up to 5 mm . Moreover , they have different habitats , one of them are prefer to live around moist environments or inside other animals bodies and mammals like humans as parasitic and cause serious problems , which are flatworms. However, nematoda live in nearly all habitats from poles to tropics. There are four major classes of flatworms such as Cestoda known as tapeworms, Turbellaria are planarians, Trematoda are flukes and Monogenea
Roundworms are psuedocoelomate, which means they have a body cavity between their mesoderm and endoderm layers and can put more complex and complicated organ systems in the space. Nematoda rigid cuticle works with the muscles and acts as hydrostatic skeleton and circulatory system as nematodes lack circumferential muscles. While the Circulation of flatworm has a gastrovascular cavity with one opening. It eats small worms, insects and microscopic matter. Digestion A flatworm has a simple form and combination digestive and excretory system. It takes food in and gets rid of wastes from the single opening that functions as both mouth and anus. The roundworm has a complete digestive tract, with two separate openings for the mouth and anus. Nematoda has major sense organs in the head, or front end. There is primitive nerve net in the simpler forms and several nerve cords from a brain along the length of the body. Nervous A flatworm has a very simple nervous system with two nerve cords running down either