Rev 09/13/2023

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          Hemicaloosia Ray & Das, 1978

Type species of the genus:  Hemicaloosia americanae Ray & Das, 1978

    Hemicaloosia was considered a junior synonym of Caloosia by Raski and Luc (1987) but recognized as a valid taxon by Siddiqi (2000) (Inserra et al., 2013).

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Morphology and Anatomy:

Hemicaloosia spp are either amphimictic (with males and females having s functional spermatheca) or non-amphimictic (lacking males anfd females lacking a functional spermatheca)..

Female: Cuticle with an extra-cuticular membranous layer, much thinner than body cuticle and closely adpressed to it. 

Lateral field nearly always present. 

Monovarial, prodelphic, vagina sigmoid

Tail elongate, conoid to filiform.

Male: Labial region continuous, framework not as "spectacle mark."

Spicules straight.  

Caudal alae peloderan, covering more than one-third of the tail.  

Tail shorter than that of female.

Juvenile: Cuticle and labial area as in corresponding female.

Hemicaloosia spp differ from sheath nematodes (Hemicycliophora spp.) in that the sheath is membranous and fits tight around the body rather than detached and loose.  The sheath in Hemicaloosia is actually the outermost layer of the body cuticle rather thyan an extra cuticle (Inserra et al., 2013).

Hemicaloosia and Caloosia are very similar in the configuration of the labial area, large amphids and a vagina vera with thick cuticle.


Body size range for the species of this genus in the database - Click:



Key to Species of Hemicaloosia See Inserra, et al. (2013).


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The genus mainly contains warm-climate species from Asia, Africa and the Americas (Inserra et al., 2013).

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Economic Importance:


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For an extensive host range list for this genus, click
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Life Cycle:

For Ecophysiological Parameters for this genus, click 
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Inserra, R. N., Stanley, J.D., Troccoli, A., Chitambar, J., Subbotin, S.A. 2013. Hemicaloosia vagisclera n. sp. (Nematoda: Caloosiidae) from Bermuda grass in Florida and its phylogenetic relationships with other criconematids. Nematology 15: 23-39.

Raski, D.J. & Luc, M. (1987). A reappraisal of Tylenchina (Nematoda) 10. The superfamily Criconematoidea Taylor, 1936. Revue de Nématologie 10, 409-444.

Ray, S. & Das, S.N. (1978). Hemicaloosia americanae n. gen. n. sp. (Nematoda: Hemicycliophoridae) from Orissa, India. Journal of Research, OUAT, Bhubaneswar, India 8, 131-138.

Siddiqi, M.R. (2000). Tylenchida parasites of plants and insects, 2nd edition. Wallingford, UK, CABI Publishing, 833 pp.

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Copyright © 1999 by Howard Ferris.
Revised: September 13, 2023.