Robustodorus megadorus

Robustodorus megadorus	Contents	Rev 11/19/2019
	Classification	Hosts
	Morphology and Anatomy	Life Cycle
Return to Robustodorus Menu	Economic Importance	Damage
	Distribution	Management
Return to Aphelenchoididae Menu	Feeding	References
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Classification:

       Tylenchida
       Aphelenchina
         Aphelenchoidea
          Aphelenchoididae
           Aphelenchoidinae
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Robustodorus megadorus (Allen, 1941) Andrassy, 2007

Aphelenchoides megadorus was described by Allen (1941) from specimens collected in desert soil near Mosida, Utah. Allens original description of A. megadorus did not designate a holotype, was based on drawings of poorly preserved specimens and did not include photographs, Goodey (1960) considered that the relatively (for a member of the Aphelenchoididaei) massive stylet with large knobs, the tapering of the esophagus anterior to the metacorpus, and the lack of a mucro on the tail. were sufficiently different to establish a new genus, Megadorus, with type species Megadorus megadorus (Allen, 1941) Goodey, 1960. Andrassy (2007) determined that the genus name Megadorus was pre-emptively used in the Class Insecta and established the genus Robustodorus, with type species Robustodorus megadorus (Allen, 1941) Andrassy, 2007.

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Morphology and Anatomy:

Female:

Body is short and C-shaped when fixed.
Lateral fields a with three incisures
Deirids, phasmids, nor paravulval papillae not seen
Head hemispherical, smooth, offset by deep constriction
Small oral disk slighly elevated, surrounded by six pores.
Amphid openings small pores.
Stylet is 17 to 20 um long, robust, with the conical portion slightly longer than the cylindrical shaft, Knobs 2 to 3 um diam.
Metacorpus large, rounded-ovoid. DEGO just anterior to the metacorpus valve. Two subventral glands ducts open immediately after the valve. Excretrory pore opening ventral, between the metacorpus and nerve ring.
Esophageal glands overlap the intestine dorsally.R
eproductive system monodelphic-prodelphic with a postuterine branch 1.3 to 2.3 times vulval body diameter
Vulva a transverse, thick-lipped slit, no vulval flap.
Crustaformeria pear shaped, anterior to uterus and separated by a sphincter
Spermatheca oval, without sperm.
Tail, slightly curved ventrally,conically rounded, 2x abd in length, tip smoothh, no mucro,.

Male:

Not found

Ref Rhyss et al., 2013

Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

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Distribution:

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Economic Importance:

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Feeding:

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Hosts:

For an extensive host range list for this species, click

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Life Cycle:

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click	If species level data are not available, click for genus level parameters

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Damage:

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Management:

Host Plant Resistance, Non-hosts and Crop Rotation alternatives:

For plants reported to have some level of resistance to this species, click

Robustidorus megadorus specimens have been seen infected with Pasteuria sp. (Ryss et al, 2013).

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References:

Allen, M.W.(1941). Aphelenchoides megadorus, a new species of Tylenchoidea (Nematoda). Proceedings of the Helminthological Society of Washington 821-23.

Andrássy, I. 2007. Free-living Nematodes of Hungary (Nematoda Errantia) Vol. II. Hungarian Natural History Museum. Budapest. Hungary, 496 pp.

Kanzaki, N., E. Shokoohi, H Fourie, A Swart, L Muller, R.M. Giblin-Davis. 2018. On the morphology and phylogeny of Robustodorus AndrÃ¡ssy, 2007 and two â€˜Aphelenchoidesâ€™ species (Nematoda: Aphelenchoidinae). Nematology 20:601-615.

Ryss, A.Y., McClure, M.A., Nischwitz, C., Dhiman, C., and Subbotin, S.A. 2013. Redescription of Robustodorus megadorus with Molecular Characterization and Analysis of Its Phylogenetic Position within the Family Aphelenchoididae. J. Nematology 45:237-252.