Enchodelus conicaudatus (Ditlevsen, 1927) Thorne, 1939

P. A. A. LOOF, 1971, FREELIVING AND PLANT PARASITIC NEMATODES FROM SPITZBERGEN, COLLECTED BY MR. H. VAN ROSSEN, Mededelingen Landbouwhogeschool Wageningen 71, pp. 1-86 : 64-65

Enchodelus conicaudatus (Ditlevsen, 1927) Thorne, 1939

( Fig. 21 ; Diagram 1).

Dimensions:

Females (n = 6): L = 1.80- 2.15 mm: a = 33 -42; b = 6.0-7.8; c = 52 -67; V = 14- 1741_47l5- 20

Fourth—stage juveniles (n = 5): L = 1.33-1.55 mm; a = 33 -35; b = 6.5 - 7.3; c = 43 - 58; V = 43 - 48.

One female has V = 53.

Lip region offset by depression. Cuticle 4 [x thick, increasing to 6 [x on tail. Outer layer sharply demarcated. Lateral chord one-fourth to one-fifth of body width in mid-body. Length of odontostyle 18 -19 y. in adults; the L - 4 have an odontostyle of 15-17 jx and a spare one of 18 -19 fx. Posterior portion of spear 24 [x long in adults. Oesophagus anteriorly with distinct, somewhat muscular swelling.

Oesophageal characters (four females). The oesophagus begins to widen at 59- 61 % and attains its full width at 68 -69 % of its length from head end. DO lies a short distance anterior to the latter level, the distance DO-DN is 12-14 jx. SiN rather indistinct, located about halfway between DN and S2N; the S2N are well developed. Locations:

DO 65- 67 %; 8^ 7 8- 80 %; S2N 89 -91 %;

D N 70-71 %; SjO 78 - 80 %; S20 90-92 %;

DO - D N 4.0 -4.8 %;

Vulva transverse, vagina more than one-half body width deep, with distinct sclerotization. Uterus very spacious. Oviduct with distinct sphincter. No sperm. On the ventral side the tail contains 'saccate bodies' which may extend to one anal body width anterior to the anus. Tail 1.1-1.2 anal body widths long. Rectum 1.0-1.2 anal body widths long, prerectum two to three times as long as rectum. Body tapering markedly anteriorly, the diameter at the base of the

1.

Oesophagus being almost four times the width of the lip region. Dimensions of three intra-uterine eggs: 85 -90 x 34-38 jx.

The specimens agree well with Ditlevsen's description. As he gives a body length of 2.0 mm and a tail length of 33 [x, the value of 'c' is 61, not 30 as stated in the text.

Females in samples 1,46 and 68; juveniles in samples 3, 7, 27, 29, 31, 34, 37, 39, 49, 52, 66 and 69.

Figures

FIG. 21. Enchodelus conicaudatus(Ditlevsen),female.A: head end; B: part of reproductive system; C: tail.