What is the function of copulatory spicules?
Males of roundworms (Nematoda) usually possess cuticular copulatory organs (spicules) that are inserted in the female’s vulva to attach the male to the female and to widen the vulva against the inner body pressure for sperm transfer.
Which disease is caused by nematode worm?
Dracunculiasis (guinea worm disease) is caused by the nematode (roundworm) Dracunculus medinensis.
How will you distinguish female nematodes from male nematodes?
The female nematode is wider than the male by half an inch. Look at the tail of nematodes. The males have a bent tail. The female has a straight tail.
What are Spicule parasites?
In nematodes, spicules, also known as copulatory spicules, are needle-like mating structures found only in males. Male nematodes may have one or two spicules which serve to open the vulva of females and facilitate the transmission of sperm, although sperm is not transferred directly by or through the spicules.
What is copulatory bursa?
[′käp·yə·lə‚tȯr·ē ′bər·sə] (invertebrate zoology) A sac that receives the sperm during copulation in certain insects. The caudal expansion of certain male nematodes that functions as a clasper during copulation.
How are parasitic nematodes transmitted to humans?
Other nematode parasites of humans are transmitted by eating meat that is not cooked sufficiently or through contact with faeces, or water contaminated with faeces, from humans or animals.
Do nematodes have separate sexes?
The majority of studies on mixed breeding systems have focused on flowering plants, where hermaphroditism has evolved into species with separate sexes on multiple occasions6,7. Nematodes exhibit a wide diversity of breeding systems, including trioecy18,19,20,21,22,23,24,25.
Why are female worms longer than males?
This sexual-dimorphism is possibly due to the difference in the energy expenditure. It is recognized that the energy expenditure of a male tends to be higher than that of a female in humans10 and insects.
What are the three main parts that are common in the phylum Nematoda?
Following are the important characteristics of Nematoda:
- Their body is bilaterally symmetrical and triploblastic.
- They are cylindrical in shape.
- They exhibit tissue level organization.
- Their body has a cavity or pseudocoelom.
- The alimentary canal is distinct, with the mouth and the anus.
- They are sexually dimorphic.
Do nematodes have circular muscles?
Recall that nematodes lack circular muscles, and can only move by contracting their longitudinal muscles, thus thrashing and wriggling rather than crawling.
What kind of spicules does a nematode have?
Spicule (nematode anatomy) In nematodes (roundworms), spicules, or copulatory spicules, are needle-like mating structures found only in males. Males nematodes may have one or two spicules, which serve to open the vulva of females, and facilitate the transmission of sperm, although sperm is not transferred directly by or through the spicules.
How big does a gall nematode get on a plant?
Commonly called as Gall-nematode. It is first plant parasitic nematode to be discovered. 2. Males measure 2.4 mm and females 3.8 mm in length.
Are there any nematodes that are both male and female?
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.
What kind of parasite is plectropomin in New Caledonia?
Capillaria plectropomin. sp. (Nematoda: Capillariidae), a new intestinal parasite of the leopard coral grouper Plectropomus leopardus(Serranidae) off New Caledonia Capillaria plectropomin. sp. (Nematoda : Capillariidae), un nouveau parasite intestinal de la saumonée Plectropomus leopardus(Serranidae) en Nouvelle-Calédonie