Prismatolaimus primitivus A..L O O F 1971, n.sp.

Prismatolaimus primitivus n.sp.

(Fig. 18).

Dimensions:

Females (n = 5): L = 0.51 - 0.74 mm; a = 42 -51; b = 3.6 -4.4; c = 3.0-4.0; V = * - 943-446- 9.

Female, holotype: L = 0.53 mm; a = 46; b = 3.9; c = 3.3; V = 7436.

Cuticular annulation not very conspicuous, best visible on the proximal part of the tail. Width of head at level of middle of stoma 6-7 jx. Body width at base of oesophagus 1.4-1.6 X width ofhead. The amphids open through a transverse slit located 23 -28 |x or 3.3 - 3.8 head widths from the anterior end. Buccal cavity 7;x deep, slightly more than twice as deep as wide. Around the vestibule there are six cephalic setae measuring 3.0 - 3.6 fx. Four slender subcephalic setae are placed distinctly behind the cephalic ones (2 fx behind them, at level of middle of stoma). Vulva transverse, inconspicuous. Gonads paired, opposed, generally asymmetrically developed. Dimensions of two itra-uterine eggs: 48 x 10;x and 74 x 13 \x. Length of tail equal to 15-25 anal body widths.

Holotype: Female on slide WT 1165. Paratypes: Four females on slides WT 1166-1168.

Type habitat and locality: Sample 8. Found also in samples 9, 34 and 41.

This species is conspicuous for the position of the four subcephalic setae, which have not jointed the six cephalic ones to form a circle of ten, and thus show a primitive arrangement. In other respects it is a minor edition of P. dolichurus.