Rev 05/27/2022

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Diastolaimus  Rahm, 1928

Taxonomic note:

Cid (2012) indicates a total of six species of Diastolaimus, Rahm, 1928.  Of those, D. papillatus Rahm, 1928 and 1929 seems to have been moved to Macrolaimus by Goodey (1951) and then to Chambersiella by Sanwal (1960).  The type species is indicated as D. croca (Massey, 1963) Andrassy, 1984. Other species include D. grossus (Truskova & Eroshenko, 1977) Andrassy, 1984, D. damalis (Massey, 1966) Andrassy, 1984, D. aculentus (Von Daday, 1905) Andrassy, 1984 and D. mexicana (Cid, 2012). Fescia grossa Truskova & Eroshenko, 1977 was transferred to Diastolaimus as D. grossus by Andrassy (1984)

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Morphology and Anatomy:


Diastolaimus croca:  A, B. Head (a) amphid aperture (s)
sensilla pouch; C. Face view; D. Male tail; E. Female midbody; F. Female

Diastolaimus (Santafea) croca, from Massey, 1963

Body size range for the species of this genus in the database - Click:
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The type specimens were taken from the Sandia Mountains, Cibola National Forest, and the Otowi section of Bandelier National Monument in New Mexico.

They :were found associated with Scolytus ventralis Lee  in Abies concolor (Gord. and Glend.) Lindl. and Phloeosinus sp. in Juniperus osteosperma (Torr.) Little.
(Massey, 1963).

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Bacterial feeder.

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Biology and Ecology:

Nematodes in the Chambersiellidae are frequently reported in assocaiation with bark beetles.  The relationships are probably phoretic in that the nematodes are transported from tree to tree or to insect galleries by the beetles.


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Life Cycle:


For Ecophysiological Parameters for this genus, click 


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Ecosystem Functions and Services:



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Andrassy, I. 1984. Klasse Nematoda (Ordnungen Monhysterida, Desmocolecida, Araeolaimida, Chromadorida, Rhabditida) Bestimmungsbűcher zur Bodenfauna Europas, No.9. Berlin (Deutschland): Akademie Verlag.

Cid del Prado, V.I.. 2012. Two new species of nematodes (Cephalobida: Chambersiellidae) from moss from North and South America. Nematropica 42:108-114.

Goodey, T. 1952. Soil and Freshwater Nematodes: A Monograph. Methuen, London. 390pp.

Massey, C.L. 1963. Santafea new genus (Rhabditoidea, Chambersiellidae) and a change in the systematic position of Macrolaimus Maupas, 1900. Proc. Helminthol. Soc. Wash. 30:26-28.

Rahm, G. F. 1928. Alguns nematodes parasitas e semiparasitas das plantas culturaes do Brasil. Arch. Inst. Biol. Andina Lima, 1 : 239-252.

Rahm, G.F. 1929. Nematodes parasitas e semi-parasitas de diversas plantas culturaes do Brasil. Arch. Inst. Biol. Andina Lima, 1,2: 67-135.

Sanwal, K.C. 1960. Taxonomic position of Macrolaimus papillatus (Rahm, 1928) Goodey, 1951, status of Diastolaimus Rahm, 1928, and emended diagnoses of Chambersiellidae and Chambersiella Cobb, 1920.(Nematoda). Canadian J. Zoology 38:751-753.

Sanwal, K. C. 1971. Geraldius n. gen., Macrolaiminae n. subfam., with a revision of the subfamilies and genera of Chambersiellidae (Nematoda). Canadian J. Zoology 49:965-967.

Truskova, G.M. & Eroshenko, A.S. 1977. Nematodo-fauna vegetativnykh organov travjanistykhi i drevesnykh rastenij elnikov primorja. Trudy Biologio-Pochvennogo Instituta 47, 35-49.

Von Daday, J. 1905. Untersuchungen �ber die S�sswasser-Mikrofauna Paraguays. Zoologica. Stuttgart 18 (44):1-374.

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Copyright 1999 by Howard Ferris.
Revised: May 27, 2022 .