Malvinia crassa

Malvinia crassa	Contents	Rev: 06/15/2025
	Classification	Hosts
	Morphology and Anatomy	Life Cycle
Return to Malvinia Menu	Economic Importance	Damage
	Distribution	Management
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Classification:

Chromadorea Rhabditida Tylenchina Drilonematoidea
Ungellidae

Morphology and Anatomy:

Paired, dorsally-directed, blade-like cephalic hooks present.
Cephalic sensilla and amphids not discernible.
Mouth aperture minute, displaced dorsally; stoma short, infundibular;
Pharynx with pre-corpal swelling, procorpus, isthmus and terminal bulb. Nerve ring encircling isthmus. Excretory pore situated just posterior to nerve ring.
Fimbriate organs situated in caudal region, with wide aperture, no visible cavity and radially striated basal rim.

Ref: Ivanova and Neuhaus, 2009

Female:

Prodelphic, monodelphic,
Vulva mid-body, vagina straight.
Spermatheca offset;

Male:

Monorchic; reflexed portion of testis very long.
Spicules paired, curved;
Gubernaculum shallow, plate-like.
Bursa and caudal sensilla absent.

Malvinia crassa. A: Male, entire body; B: Female, entire body; C: Female head; D, E: Male head; F: Pharyngeal region of female; G: Excretory pore region of female; H: Male tail; I: Egg; J, K: Spicule and gubernaculum; L: Caudal organ of female. All in lateral position. (Scale bars in um)
Drawings from Ivanova and Neuhaus, 2009

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