Eudorylaimus subjunctus, 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 : 69-71

Eudorylaimus subjunctus n.sp. ( Fig. 24 ; Diagram 4)

Dimensions:

Females (n = 10): L = 1.01 -1.19 mm; a = 26-28; b = 2.8 -3.6; c = 21 -25; V = 10 - 1555 - 6010 - 14.

Female, holotype: L = 1.12 mm; a = 27; b = 3.1; c = 23; V = " S S10.

Male unknown.

Body curved slightly in death, tail bent more strongly, to ventral side. Cuticle 2 [x thick, increasing to 3 \± on tail; distinctly layered, the outer layer with fine but distinct transverse striation. Lateral chord one-sixth of body width. Lip region offset by constriction, its width 40 % of body diameter at base of oesophagus, its height 40 % of its width; lips well developed, separate, somewhat angular, the papillae not protruding. Amphids half the correspondingbody width. Odontostyle 15 -18 jx long or 1.0-1.3 x width of lip region, the aperture occupying one-third of its length. Basal portion 24-26JJL long, linear. Guiding ring 'single'. The nerve ring surrounds the oesophagusatabouttwo-fifthsofits length from head end. Hemizonid not seen. Cardia bulky, ovoid,25JJ. long.

Oesophageal characters (three females): The oesophagusbeginstowidenat 52 -55 % and attains its full width at 60-63 % ofitslengthfrom headend.DO lies at the latter level, the distance DO-DN is 13-22(x. TheSiN liea small distance apart, far behind the middle ofthe distanceDN- S 2N; theanteriorone is smaller. The S2N are well developed. DN measures 10 X 4 JJL,nucleolus3 [i; SiN! 4 x 1.5 (x, nucleolus 1 (i.;SjN2 7 X 3 [i, nucleolus 2.5 \i; S2N 5(j., nucleolus 2.5 (j.. Locations:

DO 61- 62 %; S ^ 7 7%; S2N 8 8 - 9 0 %; K = 71 - 78;

D N 6 7 %; SiN 2 7 8- 8 2%; S2 0 8 9- 9 2 %; K ' = 78 - 87.

D O - D N 4.4- 6.4 %; dist. 0.8-3.8%;

Vulva of the transverse type, vagina distinctly sclerotized, less than half body width deep. Gonads two, opposed, reflexed, with a distinct sphincter in the oviduct. No sperm. Tail conoid with blunt tip; slightly bent to ventral side, 2. 1 - 2.4 anal body widths long. Rectum slightly longer than anal body diameter, prerectum 1.5-2.5 X as long as rectum.

Holotype: Female on slide WT 1172. Paratypes: Nine females on slides WT 1173 - 1179.

Type habitat and locality: Sample 64. Paratypes also from samples 34,37, 48 and 52. Found furthermore in samples 9, 10, 11, 42 and 46. The population from sample 9 has slightly different dimensions: it is slenderer and the vulva lies more anterior. Dimensions of three females: L = 1.10-1.30 mm; a = 29- 37; b = 3.4- 3.9; c = 25- 35; V = 9 - 1 1 50- 529 - 12.

Through the blunt, conoid-arcuate tail this species resembles E.junctus (Thorne & Swanger, 1936) Andrassy, 1959 . It differs from that species by the much shorter odontostyle (against 23 \L), longer aperture, post-equatorial vulva, and more distinct lips. From E. santosi (Meyl, 1957) it differs by the striated cuticle and blunt terminus, from E. nodus (Thorne & Swanger, 1936) by the well separate lips and more anteriorly expanded oesophagus; from E.allgéni (Andrâssy, 1958) , of which only the male is known, by the longer tail (T/ABW = 1 in allgéni ).

Figures

FIG. 24. Eudorylaimus subjunctus n.sp., female.A:head end; B: oesophagus base; C: vulva; D: tail; E: entire specimen.