Crassolabium costaricense

Crassolabium costaricense	Contents	Rev 09/22/2022
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Crassolabium Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Dorylaimidae Menu	Feeding	References
	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

Enoplea

Dorylaimia
Dorylaimida

Dorylaimidae

Labronematinae

Crassolabium costaricense Varela-Benavides & Pena-Santiago, 2018

Morphology and Anatomy:

Moderately slender nematodes, medium length (1.16-1.37 mm long).
Body cylindrical, slightly tapering towards both extremities
Tail short and rounded.
Cuticle typical two-layered, with very fine transverse striation.
Lateral chord 7.5-9.5 ÃŽÂ¼m wide at mid-body; body pores obscure.
Lip region truncate, weakly angular, nearly continuous with adjacent body, 2.6-3.3 times as wide as high and 23-29% of body diam. at neck base.
Lips mostly amalgamated, labial and cephalic papillae barely protruding.
Amphid fovea cup-like, opening occupying 51-70% of lip region diam.
Odontostyle robust, 4.7-6.1 times as long as wide, 1.2-1.5 times lip region diam. 1/3 to 2/5 of odontostyle length. Guiding ring simple.
Odontophore rod-like, 1.2-1.5 times odontostyle length.
Esophagus with a slender but muscular anterior region, enlarging gradually, basal expansion occupying less than one-half (40-45%) of total esophagus length.
Nerve ring located at r 33-41% of total esophagus length.
Cardia conical, 12-16 Ãƒâ€” 10-12 ÃŽÂ¼m and surrounded by intestinal wall.
Pseudocoelomocytes also present in posterior body region, located either in dorsal or in dorsal and ventral position.

Female:

Genital system didelphic-amphidelphic, both branches equally developed.
Ovaries reflexed, variably developed, oocytes arranged first in several rows and then in a single row. Oviduct joining ovary subterminally, consisting of a tubular part and a moderately developed pars dilatata with small lumen. Oviduct-uterus junction with distinct sphincter.
Vagina extending inwards 33-38% of corresponding body diam., pars proximalis with slightly sigmoid walls and surrounded by weak musculature, pars refringens vaginae with two distinct, triangular to trapezoidal, pieces, pars distalis nearly absent.
Vulva probably a short transverse slit.
Tail short and rounded. Two pairs of caudal pores, one subdorsal, one lateral or subventral

Males:

Prerectum 2.8-3.3 anal body diam. long.
Genital system diorchic, with opposed testes.
Besides an adcloacal pair of supplements 6-8 ÃŽÂ¼m from cloacal aperture, a series of 8-10 closely and regularly spaced (9-16 ÃŽÂ¼m apart) ventromedian supplements located outside range of spicules.
Spicules curved ventrad and moderately robust, 4.6-5.4 times as long as wide and 1.4-1.6 anal body diam. long,. curvature 130Ã‚Â°, median piece occupying nearly half of spicule width. Lateral guiding pieces comparatively short and robust, somewhat fusiform, 9-11 ÃŽÂ¼m long and 3-4 times as long as wide, with bifurcate terminus.
Tail somewhat more conoid and straighter on its ventral margin than that of female.

Ref: adapted from Varela-Benavides & Pena-Santiago (2018)

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

Distribution:

Reported from tropical forest soil in Costa Rica.

Feeding:

Designated omnivore-predator by Yeates et al (1993).

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. 608p.

Varela-Benavides, I. and R. PeÃƒÂ±a-Santiago. 2018. Description of Crassolabium costaricense sp. n. (Nematoda: Dorylaimida: Dorylaimidae) from Costa Rica. Nematology 20:1007-1014.

Yeates, G.W., T. Bongers, R. G. M. De Goede, D. W. Freckman, and S. S. Georgieva. 1993. Feeding habits in soil nematode families and genera—An outline for soil ecologists. Journal of Nematology 25:315-331.