Genus Paratylenchus

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ORDER RHABDITIDA
INFRAORDER TYLENCHOMORPHA
            Family Tylenchulidae
                        Genus Paratylenchus

 

Genus Paratylenchus
Micoletzky, 1922
Syn.: Cacopaurus Thorne, 1943

“Definition:  Paratylenchinae.
Small nematodes, under 0.5 mm. long.  Female may swell slightly and become sessile parasite.  Head conical or rounded, usually without annules, rarely offset in any way.  Spear strong, variable in length but may be relatively very long, fore part longer than shaft; basal knobs rounded.  Procorpus  and median bulb amalgamated, containing large crescentic valve plates.  Isthmus narrow but relatively long, leading to a rounded or spathulate terminal bulb.  Body distinctly annulated; lateral field usually with 4 incisures.  Vulva posterior, protected on either side by a membrane of cuticle; leading into a vagina which stretches halfway or more into the body.  Uterus composed of a number of large cells, sometimes with an open chamber adjoining the vagina; a spermatheca, packed with sperms, present apparently as a diverticulum of the upper end of the uterus.  Ovary outstrectched, prodelphic; no post-vulval sac.  Anus often obscure, tail conical to a variously shaped point.  Body becomes C-shaped when killed by heat.  Male more slender, spear and oesophagus usually faint and ill-defined or non-existant.  Spicules long, slender and pointed; gubernaculum short.  At the anus a short sheath usually protrudes, which may have a process at its posterior edge.  Tail with slight or without bursa.  Male tail conoid to a variously shaped point.” From Goodey 1963 snd Powers and Mullin website http://nematode.unl.edu/


References:

Goodey T. and J.B. Goodey. 1963. Soil and Freshwater Nematodes.  Butler and Tanner Ltd, London, Great Britain

Powers T. and P. Mullin. Plant and Insect Parasitic Nematodes. University of Nebraska Nematology Website. http://nematode.unl.edu/