Lenisaphelenchus ulomae

Lenisaphelenchus ulomae	Contents	Rev 12/17/2024
	Classification	Hosts
	Morphology and Anatomy	Life Cycle
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	Distribution	Management
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Classification:

      Chromadorea
       Rhabditida
       Tylenchina
         Aphelenchoidea
          Aphelenchoididae
           Ektaphelenchinae

Lenisaphelenchus ulomae Kanzali & Hamaguchi, 2020

The type species of the genus

Morphology and Anatomy:

Body cylindrical.
Cuticle moderate thickness, finely or coarsely annulated, surface annulations seem wider than internal pattern.
Lateral field consisting of three bands (= four lines) with two bands on either side higher and narrower than middle one.
Six equal-sized lips forming a dome-shaped anterior continuous with body contour,
Stylet moderately thick, with a wide lumen, separated into two parts, anterior section long, occupying more than half of total stylet length, weakly separated into two conus and conophore; shaft without clear basal swellings.
Procorpus tube-like, relatively short, < 2x stylet length, ending in well-developed metacorpus.
Metacorpus slightly elongated, oval or pear-shaped with glandular anterior part and muscular posterior part, conspicuous valve between glandular and muscular parts.
Pharyngo-intestinal junction (cardia) relatively large, immediately posterior to median bulb; isthmus absent.
Nerve ring immediately posterior to pharyngo-intestinal junction, surrounding intestine and pharyngeal gland.
Postcorpus (pharyngeal gland) narrow, overlapping intestine dorsally, ca four metacorpal lengths long.
Hemizonid ca one metacorpal length posterior to nerve ring, or ca 1.5 metacorpal lengths posterior to base of metacorpus.

Female:

Monodelphic, prodelphic, located on right subventral side of intestine; PUS absent.
Reproductive tract consisting of ;
Spermatheca roundish rectangular or oval-shaped, harboring mature sperm in observed individuals.
Crustaformeria composed of relatively large and rounded cells, not conspicuous.
Uterus with thick wall,
Vulva lacking flap apparatus.
Rectum and anus present, but seemingly vestigial (not functional).
Tail conical with narrow, roundish-squared tip.

Male:

Monorchic, testis outstretched, located on right subventral side of intestine.
Spermatocytes arranged in multiple (2-3) rows in anterior two-fifths and well-developed small amoeboid sperm tightly packed in posterior part of testis.
Vas deferens c of large flattened cells, occupying posterior two-fifths of total gonad.
Spicules paired, seemingly not fused, capitulum well developed, composed of slightly dorsally truncate roundish-squared condylus and triangular rostrum with blunt tip, c
Gubernaculum absent.
Tail without bursa or bursal flap and with slightly elongate and bluntly pointed terminus, but not forming true mucron.
Two pairs of papilliform genital papillae present, anterior pair adcloacal and posterior pair at mid-tail.

Ref: Kanzaki and hamaguchi, 2120

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

Many groups of insects are associated with parasitic, phoretic, mutualistic and ammensal nematodes. However, the nematode associates of tenebrionid beetles have not been sufficiently examined except for those used as bait for entomopathogenic nematodes All field-collected tenebrionid-associated nematodes are the juveniles or eggs of spirurid and ascarid vertebrate parasites that apparently use the beetles as intermediate hosts. In the case of Lenisaphelenchus ulomae, the parasitic nematode uses the tenebrionid beetle as its final host.

The host insect, Uloma marseuli, is widely distributed in East Asia. It is univoltine and overwinters in dead trees so its habitat is sufficiently humid. The eggs of both nematode parasite and host beetle hatch and develop to adults in the same place, suggesting both parasites and phoretic associates can be transmitted vertically (Kanzaki and Hamaguchi, 2020.

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Economic Importance:

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Feeding:

Collected from the body cavity of overwintering adults of Uloma marseuli taken from a rotten tree.

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Hosts:

Uloma marseuli, a tenebrionid beetle.

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Life Cycle:

Lenisaphelenchus ulomae uses the tenebrionid beetle as its final host.

The host insect, Uloma marseuli, is univoltine and overwinters in dead trees so its habitat is sufficiently humid. The eggs of both nematode parasite and host beetle hatch and develop to adults in the same place, suggesting both parasites and phoretic associates can be transmitted vertically (Kanzaki and Hamaguchi, 2020.

Ecophysiological Parameters:

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