Paraxonchium laetificans

Paraxonchium laetificans	Contents	Rev 02/21/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Paraxonchium Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Paraxonchiidae Menu	Feeding	References
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Paraxonchiinae

Paraxonchium laetificans (Andrassy, 1956) Altherr & Loof, 1969

Synonyms:

Dorylaimus laetificans Andrassy, 1956

Paraxonchium striatum Krall, 1958

Drepanodorus laetificans (Andrassy, 1956) Andrassy, 1958

Aporcelaimus laetificans (Andrassy, 1956) Andrassy, 1985

Paraxonchium magnidens Thorne, 1974

Morphology and Anatomy:

Body plump, but conspicuously narrowed in anterior part of neck towards the very narrow lip region.
Lip region somewhat angular, set off by constriction.
Amphid stirrup-shaped, the aperture about half as wide as the lip region.
Cuticle thick, especially on tail, and with minute transverse striae
Lateral and ventral hypodermal glands and pores conspicuous.
Lateral pores and glands in two rows, laterosubventral and laterosubdorsal in position.
Odontostyle short and cuticularised, 4.0 â€“ 5.0 times as long as wide, 0.6-0.9 times as long as lip region diameter and 0.8 â€“ 1.1% of body length. Aperture occupies 53 â€“ 67% of odontostyle length with large dorsal aperture, comprising 60% (56-63) of the stylet length. Ventral "closed" part of stylet not circular in cross section, but laterally compressed.
Base of odontostyle apparently not "forked" (i.e. without basal collar for attachment of odontophore).
Odontophore long but posterior end unclear. No guiding ring or plicated guiding sheath visible.
Esophagus typically dorylaimoid, gradually widened into basal bulb slightly beyond middle of neck. Basal bulb very granular in appearance.
Three oblong cardiac glands at base of oesophagus mostly quite distinct.
Esophageal-intestinal junction surrounded by tissue containing several cells, associated with the three cardiac glands. Cardia conspicuous, consisting of a broad hemispherical basal part largely embedded in intestinal tissue, with an elongate-conoid distal part projecting into lumen of intestine.
.Prerectum very variable in length,
Tail conoid, with rounded terminus, tending to be very slightly subdigitate.
Dorsal and other pores conspicuous on the tail.

Female:

Didelphic, vulva transverse, post-equatorial, the vulval lips distinctly sclerotized.
Ovejector apparently not strongly demarcated.
Uterus short, undifferentiated, distinctly separated from the oviduct by a sphincter.
Gravid females with one, two or three uterine eggs.
Egg shell thick (up to 6 um) along sides of egg, but mostly very thin (about 1 um) around each end of egg.

Male:

Reproductive system typically dorylaimoid.
Spicules 63 um long
No gubernaculum or lateral guiding pieces.
Adanal pair of supplements close to anus, and a ventromedian (more or less contiguous) series of 18, anterior to the cloace.

From Heyns, 1988; Ileva, et al. 2017

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

Life Cycle:

Ecophysiological Parameters:

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

Ecosystem Functions and Services:

References:

Andrassy, I. 2009. Free-living Nematodes of Hungary III. Hungarian Natural History Museum, Budapest. 608.

Heyns, J. 1958. Redescriiption of Paraxonchium laetificans (Andrassy, 1956) and P. monohystera (Brzeski, 1964)(Nematoda: Dorylaimida). Nematologica.

Ilieva, Z.I., Iliev, I.L., Georgieva, V.G. 2017. New Data on Nematodes of the Families Aporcelaimidae, Paraxonchidae, Qudsianematidae and Dorylaimidae Based on Examinations of a Raspberry Plantation in Bulgaria. Acta zool. bulgarica., 69: 171-192.

Krall, E. 1958. Paraxonchium striatum gen. n., sp. n.(Nematoda, Belondiridae): a new free-living soil nematode from Estonia. Eesti NSV Teaduste Akadeemia Toimetised.