Tripylella dentata




Rev: 11/19/2019

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Tripylella dentata Cid del Prado-Vera, Ferris, & Nadler, 2016

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Morphology and Anatomy:

Tripylella dentata Female (A.E). A. Entire body; B,D: Anterior end; C: Pharynx intestinal junction; E: Vulva region and gonads; F: Tail.

from Cid del Prado et al., 2016


  • Body C-shaped after heat relaxation and fixation.
  • Cuticle 2-3 μm thick, with fine striations and without anastomoses. Many pores and scattered setae present posterior to the cervical region along body.
  • Head region rounded, slightly flattened anteriorly, 14-17 μm wide, smooth and slightly offset from the body
  • Six lips, each with one conical inner labial papilla at the base; six conical outer labial setae, 2-3 μm long; four small cephalic setae, 1 μm long, appearing to be in a single whorl of six longer and four shorter setae.
  • Mouth cavity with two adjacent stomal chambers, the anterior smaller than the posterior. The posterior chamber has two teeth, one larger dorsal and one subventral and the anterior small stomal chamber has two small subventral teeth.
  • The subventral tooth and dorsal tooth in the posterior stomal chamber are, respectively, 14-16 and 15-18 μm from the stomal aperture. The subventral teeth in the anterior stomal chamber are 2.0-8.0 μm, anterior to the dorsal tooth in the posterior chamber.
  • Amphids caliciform, 10-18 μm from anterior end of the body.
  • Pharynx to vulva distance 217-291 μm and pharynx to anus distance 481-566  μm.
  • Cardia very large, 18-25 μm long and 21-27 μm wide, comprised of six cells.
  • Two cervical setae are present in lateral positions.
  • Excretory pore not observed.
  • Gonads reflexed, the anterior 75-113 μm long, the posterior 28-132 μm long
  • Vulva with slightly protruding lips and small oval cuticular structures.
    Rectum 0.8-1.7 times anal body diameter.
  • Tail 104-126 μm long, the posterior narrower portion of the tail is 34.4-52.7% of the tail length.
  • Tail ending in a spinneret 1-3 μm long.
  • Three pairs of caudal setae present, one pair in a lateral position posterior to the anus position, the second pair ventral and close to the end of the wide portion of the tail, and the third pair latero-dorsal at 50% of the length of the narrower part of tail.






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



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Type Locality and Habitat:  Moss on trunk of California buckeye tree, Aesculus californica Nutt, at Bobcat Ranch, Winters, California USA, 147 m above sea level.

Collector: Howard Ferris on November 4, 2013.

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Nematodes of the family Tripylidae are generalist predators of small aquatic and soil organisms. Many authors have commented on the freshwater and
wet soil in which these nematodes are found, and on the nature of their prey based on observation of intestinal contents or from behavior. Among the recorded prey, as reviewed and collated by Small (1987), are nematodes, rotifers and protozoa (Cid del Prado et al., 2012).

Interestingly similar attachment and feeding behavior occurs in other nematode groups  that, based on most characters, appear to be only distantly related.  For example, the generalist predators of the Tripylidae are in the Class Enoplea, Subclass Enoplia, Order Enoplida, the specialist predators of other nematodes in the Mononchidae are in the Class Enoplea, Subclass Dorylaimia, Order Mononshida, while the bacterivorous Plectidae are in the Class Chromadorea, Subclass Chromadoria, Order Plectida, according to the phylogeny proposed by De Ley and Blaxter, (2002, 2004).

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Biology and Ecology:

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Life Cycle:

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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Brzeski, M.W. (1965): On the identity off Trischistoma Cobb and Tripylina Brzeski. Nematologica 11:449.

Cid del Prado, I., H. Ferris and S.A. Nadler. 2010. Soil inhabiting nematodes of the genera Trischistoma, Tripylina and Tripyla from México and the USA with descriptions of new species. Journal of Nematode Morphology and Systematics 13-28-49.

 Cid del Prado Vera, I., Ferris, H., Nadler, S.A., Lamothe Argumedo, R. 2012.Four new species of Tripylina Brzeski, 1963 (Enoplida: Tripylidae) from México, with an emended diagnosis of the genus.  Journal of Nematode Morphology and Systematics 15: 71-86.

Cid del Prado-Vera, I., Ferris, H., Nadler, S.A. 2016. Five new species of the genus Tripylella (Nematoda: Enoplida: Tripylidae). Zootaxa 4109(2):198-217.

Small, R.W. 1987. A review of the prey of predatory soil nematodes. Pedobiologia, 30: 179-206.

Copyright © 1999 by Howard Ferris.
Revised: November 19, 2019.