Tylencholaimellus affinis

 

Contents

 

Rev 06/16/2023

  Classification Biology and Ecology
Morphology and Anatomy Life Cycle
Return to Tylencholaimellus Menu Ecosystem Functions and Services
Distribution Management
Return to Tylencholaimellidae Menu Feeding  References
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Classification:

Enoplea
Dorylaimia
Dorylaimida
Tylencholaimellus affinis (Brakenhoff, 1914) Thorne, 1939.
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Morphology and Anatomy:

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  • Moderately slender (a = 20-24) nematodes, small to medium size, 0.93-1.10 mm long.

  • Body cylindrical, tapering towards both ends

  • Cuticle dorylaimid, two-layered, 3-5 Î¼m thick in anterior region, 3.5-7 Î¼m at mid-body and 7-9 Î¼m on tail, outer layer thin.and with distinct radial striation.

  • Lateral chord occupying ca one-fourth of mid-body diam. Body pores obscure.

  • Lip region offset by variably distinct constriction, cap-like, 2.1-2.2 times as wide as high and one-third of body diam. at neck base, lips mostly amalgamated, with slightly protruding labial and cephalic papillae.

  • Amphidial fovea cup-like, its aperture occupying 1/2 to 2/3 of lip region diam.

  • Odontostyle typical of genus, 1.0-1.5 times lip region diam. long, dorsal stiffening piece covering entire dorsal arm, aperture short, 1/8 of total length. Guiding ring simple.

  • Odontophore 0.4-0.7 times odontostyle length, with distinct basal knobs 3-6 Î¼m broad.

  • Esophagus with a slender and weakly muscular anterior region and a nearly pyriform basal bulb occupying 12-21% of total esophagus length.

  • Cardia short, hemispheroid, 3-4 × 7-11 Î¼m.

  • Intestine lacking any differentiation.  Prerectum 1.2-2.1 and rectum 0.9-1.3 anal body diam. long. Caudal region short and rounded to conoid, visibly more straight along ventral 

 

Female:

  • Genital system mono-opisthodelphic. Anterior genital branch reduced to a simple uterine sac. Posterior ovary reflexed for two-thirds of distance to vulva, often reaching beyond  oviduct-uterus junction

  • Oocytes arranged first in two or more rows, then in a single row.

  • Vagina perpendicular to body axis, extending inwards for 38-55% of body diam., with pars proximalis 9-17 × 13-18 Î¼m long and surrounded by weak circular musculature, and pars distalis 2.0-3.8 Î¼m long.

  • Vulva a transverse slit.

 

Males:   Unknown

Ref: Vazifeh et al., 2019

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

 

 
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Distribution:

 

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Feeding:

Classified as hyphal feeding (Yeates et al., 1993) and probably on more complex fungal structures.   

Wood (1973) observed Tylencholaimellus montanus feeding and reproducing on fungi in tissue culture.

      
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Biology and Ecology:

   
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Life Cycle:

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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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Ecosystem Functions and Services:

 

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Management:

 

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References:

Thorne, G. 1939. A monograph of the nematodes of the superfamily Dorylaimoidea. Capita Zool. 8: 1-263.

Vazifeh, N., G. Niknam, H. Jabbari, A. Naghavi and R. Pena-Santiago 2019. Morphological and molecular characterisation of Tylencholaimellus zeinabadensis sp. n. (Dorylaimida: Tylencholaimellidae) from Iran, with additional data on five known species of the genus. Nematology 21:597-612.

Wood, F.H. 1973. Nematode feeding relationships: Feeding relationships of soil-dwelling nematodes. Soil Riol. Biochem. 5: 593-601.

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

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Copyright © 1999 by Howard Ferris.
Revised: June 16, 2023.