Xyo pseudohystrix




Rev 03/06/2023

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 Xyo pseudohystrix Travassos & Kloss, 1958


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Morphology and Anatomy:

Ref: Morffe et al., 2019.

  Xyo pseudohystrix. D: anterior region, face view; E: anterior region, lateral view.
Scale bar D = 30um; scale bar E = 50um
Scanning electron micropgraph adapted from Morffe et al., 2019.





  • Vulva a median transverse slit  its lips barely prominent, located near the midbody.
  • Vagina muscular, forwardly directed.
  • Genital tract didelphic-amphidelphic, both ovaries reflexed. Distal end of the anterior ovary reflexed at the level of the excretory pore, distal flexure ca. two body-widths long. Distal end of the posterior ovary reflexed at ca. 2.5 body-widths anterior to the level of the anus,
  •  Oocytes in single rows.
  •  Fusiform spermatheca present in the posterior uterus, near the level of the basal end of the anterior ovary but spermatheca absent in the anterior branch of the genital tract.
  • Eggs ellipsoidal, smooth-shelled and numerous

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

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Reported from host beetles, Odontotaenius disjunctus, from Ohio and Georgia, USA (Morffe et al., 2019).

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  Intestinal parasites of passalid beetles (Coleoptera).

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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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Morffe, J., Garcia, N., Davus, A.K., Hasegawa, K., Carreno, R.A. 2019. Morphological and molecular characterization of Xyo pseudohystrix Travassos & Kloss, 1958 (Nematoda: Oxyuridomorpha: Hystrignathidae) from Odontotaenius disjunctus (Illiger, 1800) (Coleoptera: Passalidae) from USA and discussion on its taxonomic status. Zootaxa 4619:391-400

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Copyright © 1999 by Howard Ferris.
Revised: March 06, 2023.