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The nematodes (/ ˈ n ɛ m ə t oʊ d z / NEM ... Inside the female body, the nematode hinders ovarian development and renders the bee less active, thus less ...
Caenorhabditis elegans (/ ˌ s iː n oʊ r æ b ˈ d aɪ t ə s ˈ ɛ l ə ɡ æ n s / [6]) is a free-living transparent nematode about 1 mm in length that lives in temperate soil environments. [7]
The nematode has a cuticle with 4–6 layers. The lips are offset with 4–5 annules, which are divided into tile-like structures. The nematodes body is slightly curved when relaxed. [4] [5] Females have two ovaries which overlap the spermatheca. The vulva is found near the center of the body and the rectum near the tip of the tail.
The body is long, cylindrical, and fusiform (pointed at both the ends). The body wall is composed of cuticle, epidermis and musculature. There is a pseudocoelom. Respiration is by simple diffusion. The nervous system consists of a nerve ring and many longitudinal nerve cords. Reproduction is exclusively sexual, and males are usually shorter ...
Helminths of importance in the sanitation field are the human parasites, and are classified as Nemathelminthes (nematodes) and Platyhelminthes, depending on whether they possess a round or flattened body, respectively. [8] Ringworm (dermatophytosis) is actually caused by various fungi, and not by a parasitic worm. [11] [12]
Anisakis share the common features of all nematodes: the vermiform body plan, round in cross section, and a lack of segmentation. The body cavity is reduced to a narrow pseudocoel. The mouth is located anteriorly and surrounded by projections used in feeding and sensation, with the anus slightly offset from the posterior.
The nematodes grow more rapidly and attain larger sizes in larger insect hosts. More females occur in larger hosts, as well. The nematode is still a juvenile when it emerges from the host insect, and finishes its development in the soil. The insect dies as the nematode exits its body, if not before. [1] The adult nematode does not feed. [9]
For example, in George O. Poinar Jr's 1990 book on Nematodes and Biological Control, he describes Heterorhabditis, a genus of nematodes that harbors symbiotic bacteria that are highly pathogenic to hosts, but completely harmless to them. After the bacteria kill the host, they proliferate on the host's dead body.