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Extremity of a male nematode showing the spicule, used for copulation, bar=100 μm [48] Most nematode species are dioecious, with separate male and female individuals, though some, such as Caenorhabditis elegans, are androdioecious, consisting of hermaphrodites and rare males. Both sexes possess one or two tubular gonads. In males, the sperm ...
Pratylenchus penetrans is a migratory nematode which means it moves from root to root and is also an endoparasite which means go into the roots. There are both female and male nematodes, with distinguishing differences being a spicule for the males and that males have a bent tail while females have a straight tail.
The pine wilt nematode has a typical nematode life cycle, with four juvenile stages and an adult stage with both male and female individuals that reproduce sexually. The mycophagous phase of the life cycle takes place in dead or dying wood, where the nematodes live and feed upon fungi, rather than the wood itself. The nematode cannot travel ...
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. Males are smaller than the female, have an arcuate spicules, gubernaculum with titillate and a broad striated bursa. [5]
Hoplolaimus is a genus of nematodes known commonly as lance nematodes. [1] They are parasites of plants, and three species are pests of agricultural crops. [2] These nematodes are usually about 1 to 1.5 millimeters long; [1] some reach 2 millimeters. [2] They have large stylets with knobs shaped like anchors or tulips.
The nematode moves out of its developmentally arrested third, nonfeeding stage, triggered by either bacterial or insect food signals. The nematodes feed on the bacteria and moult to the fourth stage, reaching adulthood within a few days. with separate male and female individuals. [6] Nematode development continues for two to three generations.
Some other nematodes have eye structures, but that of the female M. nigrescens is unique. It has a single eye, where other nematodes have two. Only the female has an eye, where eyes are present in both sexes of other eyed nematodes. Its eye takes up the entire front end of the body, the cylinder filling the entire body cavity.
The J2 male has a stylet while the J3 and J4 have a weaker stylet. The J2 female is longer and thinner than males and they do not molt until feeding site is established. The female juveniles begin feeding ectoparasitically on epidermal root cells. It is not until the female citrus nematode becomes a young adult that she becomes the infective stage.