Longidorella magna, 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 : 79-82

Longidorella magna n.sp.

( Fig. 29 ; Diagram 8).

Dimensions:

Female, holotype: L = 1.05 mm; a = 21; b = 3.5; c = 21; V = 1 55614; odontostyle = 30 \x.

Female, paratype: L = 1.13 mm; a = 20; b = 3.5; c = 24; V = 1 7 58 18; odontostyle = 35 \L.

Male not found.

Body stout, slightly curved ventrad in death. Cuticle 5 [x thick ventrally, 3 jj. dorsally; with thin, sharply demarcated outer layer; transverse striation imperceptible. Lateral chord one-third of body width. Body tapering strongly anteriorly, the width at base of oesophagus being 4.5 X width oflip region; the shape of the anterior part reminiscent of Paraxonchium . Lip region offset by constriction; angular, but the papillae do not protrude. Amphid aperture half corresponding body width. Odontostyle thrice as long as width of lip region, the tip bent somewhat dorsad, with very small aperture. Basal portion not sclerotized, 20- 24 \x long. The nerve ring surrounds the oesophagus just anterior to its middle. Cardia more or less round, one-quarter of body width long.

In the oesophageal region there are 9-12 ventral body pores; furthermore there are 4-5 between oesophagus base and vulva and 3 -4 between vulva and

anus. Total number on one body side 16 -21. In the anterior half of the neck there are 5 -6 dorsal pores.

Oesophageal characters: The oesophagus begins to widen at 59 % and attains its full width at 64- 66 % of its length from head end. DO lies slightly anterior to the latter level, the distance DO- DN is 16-18 JJ.. The St N lie a small distance apart, about halfway between D N and S2N; the anterior one is very indistinct. Locations:

DO 63 -65 %; S^ 78 -79 %; S2N 89-93 %; K = 67 -82;

DN 68-70 %; SiN2 81- 82 %; S20 9 1-95 %; K' = 76- 9 1.

DO - DN 4.8- 5.8 %; dist. 2.2- 3.9 %;

Vulva probably not quite transverse, vagina one-half body width deep. Gonads two, opposed, reflexed, without sperm; a sphincter appears to be present. No eggs. Tail conoid-digitate, 1.7 anal body widths long. Rectum 1.0 - 1.4 anal body widths long, prerectum twice as long as rectum.

Holotype: Female on slide WT 1143. Paratype: Female on slide WT 1142 .

Type habitat and locality: Sample 66. Juveniles in samples 17, 27 and 44.

The large body size distinguishes this species from all others.

Figures

FIG. 29. Longidorella magna n.sp.,female. A: neck region; B: part of reproductive system; C: tail; D: entire specimen.