Enchodelus parvus, A..L O O F, 1971

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 : 67

Enchodelus parvus n.sp.

( Fig. 23 ; Diagram 3).

Dimensions:

Females (n = 5): L = 0.59- 0.79 mm; a = 18 - 22; b = 3.9 -4.7; c = 37 -45; V = i 2 - " 52 _ 54 i 4 - i9.

Female, holotype: L = 0.70 mm; a = 22; b = 4.0; c = 41; V = 165415.

Body curved ventrad about 90° in death. Cuticle consisting of two sharply demarcated layers of equal thickness; total thickness 1.5 jx, increasing to 2 ji, in neck region and to 3.5 JJ. (chiefly through thickening of the inner layer) on the tail. Outer layer with fine but distinct transverse striation. Lateral chord one-quarter of body width. Lip region slightly offset by a shallow constriction: lips somewhat separate, the papillae protruding slightly. Walls of buccal cavity not conspicuously thick. Length of odontostyle 8 -10 pi, of basal portion 9-11 pi; aperture short. Length of odontostyle about equal to width of lip region. Basal portion linear, weakly sclerotized. The nerve ring surrounds the oesophagus at 43 % of its length from head end. Cardia small.

Oesophageal characters (one female): The oesophagus begins to widen at 66 % and attains its full width at 74 % of its length from head end, DO lies anterior to the latter level; the distance DO-DN is 7 pi. The SjN are invisible, but the St O are distinct, located halfway between DN and S 2N. The latter are well developed. Locations:

DO 72 %; 8,082 %; S2N 98 %;

DN 76 %; S2092 %.

DO-DN 4.1 %;

Vulva depressed, probably not quite transverse. Vagina slightly sclerotized, one-halfbody width deep. Gonads two, opposed, reflexed; uteri without sperm. A distinct sphincter is present. An intra-uterine egg measures 78 x 27 pi. Ovaries with few oocytes. Tail elongate-hemispheroid, as long as anal body width, with a few saccate bodies. Rectum as long as anal body width, prerectum about twice as long.

Holotype: Female on slide WT 1229 ; paratypes: Four females on slides WT 1230-1231.

Type habitat and locality: Sample 28. Paratypes also from samples 16 and 63.

This species resembles E.vesuvianus (Cobb, 1893) , from which it differs by the longer tail, shorter odontostyle and posterior vulva.

Figures

FIG. 23. Enchodelus parvus n.sp., female. A: neck region; B: part of reproductive system; C: tail.