Dorylaimus Dujardin, 1845 (ref. ID; 5942)
Subphylum Penetrantia: Order Dorylaimida: Suborder Dorylaimina: Family Dorylaimidae (ref. ID; 1276)
Order Dorylaimida (ref. ID; 6180)
Family Dorylaimidae (ref. ID; 5942, 6182, 6740)

[ref. ID; 1663]
Cuticle with longitudinal ridges; more than 2 mm long. Basal portion of esophagus considerably longer than wide. Abundant and common species. (ref. ID; 1663)

[ref. ID; 1795]
Miscellaneous feeder. (ref. ID; 1795)

[ref. ID; 1923]
Stylet not greatly attenuated, at most with simple basal extensions (Over 300 species, usually in soil, some species characteristically in fresh water) (ref. ID; 1923)

[ref. ID; 5942]
Prior to 1959 the genus Dorylaimus Dujardin, 1845 comprised one of the largest and most heterogeneous taxa of free-living nematodes, numbering over 200 valid species. Needed revisions initiated by Andrassy (1959, 1960) split the genus into seven, reducing the number of species of Dorylaimus to 44. Goodey (1963) redefined the genus on the basis of the type. D. stagnalis Dujardin, 1845, and included only those species with longitudinal body ridges and sexes with dissimilar tail shape. He listed 11 species of which 9 remain valid. Andrassy (1969), in the latest revision of the genus, further restricted the genus to species having females with conoid, moderately elongated tails and males with a series of 25 or more contiguous supplements. The number of valid species at the time of this revision had increased to 16. Based on the comprehensive diagnosis of Dorylaimus by Goodey (1963), as amended by Andrassy (1969), we recognize 22 valid species for which a key and tabulated list of diagnostic characters are presented. (ref. ID; 5942)

[ref. ID; 6691]
Omnivore. (ref. ID; 6691)


Dorylaimus amplexor Nesterov & Liserskaya, 1965 (ref. ID; 5942)
Description; Description of this species is inadequate and according to the figures presented belongs to another taxon. We therefore place this species in genus and species inquirenda. (ref. ID; 5942)
Dorylaimus lineatus Altherr & Deboutteville, 1972 (ref. ID; 5942)
Description; Longitudinal body ridges 38-42, very prominent, uniformly spaced by 4-5 um. Ventromedian vulval papillae well developed, generally two anterior and two posterior to level of vulva. Spermatheca long, 350 x 80 um, oval. Sperms spindle shaped, 10-15 um in length. (ref. ID; 5942)
Remarks; This species differs significantly from D. stagnalis from Canada by the much shorter and narrower stylet, presence of vulval papillae, and size and shape of the spermatheca and sperms. The spicules also are much shorter than those of D. stagnalis. Intercalation of the longitudinal ridges is a prominent feature of D. stagnalis but is absent in D. lineatus. Under low magnifications the ridges of D. lineatus are clearly visible but are obscure in D. stagnalis. Thorne and Swanger (1936) reported D. helveticus from the Lake Nipigon area of Ontario. This species is closely related to D. lineatus. (ref. ID; 5942)
Type deposited; Collection Nos. 6806, 6811, 6812. First record for Canada. (ref. ID; 5942)
Measurements; [Female]: L = 3.6 (3.0-4.3) mm; a = 36 (30-43); b = 4.4 (4.0-4.8); c = 14 (12-15); V = 49 (47-50). Stylet length = 41 (40-42) um; width = 2-3 um. Tail length 250 (200-300) um. Prerectum length = 160-250 um. (n = 10). (ref. ID; 5942)
[Male]: L = 3.5 (2.9-4.0) mm; a = 37 (30-42); b = 4.3 (3.9-4.6); c = 74 (60-86). Spicule length = 83 (80-90) um. Supplements = 38-40. Stylet length = 38 (37-40) um; width = 2-3 um. Tail length = 49 (40-60) um. (n = 10). (ref. ID; 5942)
Dorylaimus stagnalis Dujardin, 1845 (ref. ID; 881, 1795, 2592, 5942)
Description; Stylet robust, dorsal aperture at least one-third of stylet length. Longitudinal body ridges distinct, 28-32, widely spaced by 9-10 um. Vulval papillae absent although several obscure innervated organs are present anteriorly and posterior to vulva as shown by Thorne and Swanger (1936). The spermatheca is large, about 130 um long, containing numerous small, apparently asymmetrical sperms. (ref. ID; 5942)
Remarks; Thorne and Swanger (1936) reviewed the descriptions of D. stagnalis and concluded that some were of D. montanus or D. helveticus. Our specimens agree well with those described and figured by Thorne and Swanger (1936) for D. stagnalis. These authors reported this species from the Lake Nipigon area of Ontario, Canada. (ref. ID; 5942)
Type deposited; Collection Nos. 6532, 6552, 6631, 6638, 6682, 6759, 6799, 6806, 6811, 6812, 6813, 6864. These collections from Canada consisted of several hundred males and females. (ref. ID; 5942)
Measurements; [Female]: L = 5.0 (4.2-6.3) mm; a = 30 (24-34); b = 5.1 (4.5-5.7); c = 16 (14-17); V = 44 (40-47). Stylet length = 52 (50-55) um; width = 7 um. Tail length = 340 (260-400) um. Prerectum length = 280-310 um (twice anal body width) (n = 10). (ref. ID; 5942)
[Male]: L = 4.5 (3.9-5.5) mm; a = 32 (32-35); b = 5.0 (4.7-5.4); c = 100 (80-110). Spicule length = 105 (100-110) um. Stylet length = 52 (50-55) um. Tail length = 50 (40-60) um. Supplement 38-42 (n = 10). (ref. ID; 5942)
Dorylaimus sulcatus M. V. Cobb, 1915 (ref. ID; 5942)
Description; Description of this species was based on one juvenile without illustrations, which we place in species inquirenda. (ref. ID; 5942)