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 : 69-72

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 %;

D N 6 7 %;

D O - D N 4.4- 6.4 %;

S ^ 7 7%; SiN 2 7 8- 8 2%; dist. 0.8-3.8%;

S2N 8 8 - 9 0 %; S2 0 8 9- 9 2 %; K = 71 - 78; K ' = 78 - 87.

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 ).

Eudorylaimus circulifer Loof, 1961 . Syn. Dorylaimus intermedins apud Thorne & Swanger, 1936 nee de Man, 1880. Two females. Dimensions: L = 1.16-1.22 mm; a = 28 -31; b = 4.0; c = 53- 67; V = 1047.4910- ii Length of odontostyle 11 |x or 0.9 x width of lip region; the aperture occupying almost one-half of its length. Lip region continuous. Tail hemispheroid, shorter than anal body width, with saccate bodies. Rectum as long as anal body width, prerectum 1.4 x as long. These specimens are smaller and stouter than those described by Thorne & Swanger. They differ from E.

paracirculifer Brzeski, 1962 by the shorter odontostyle with longer aperture, and by the presence of saccate bodies in the tail.

Sample 63.

Figures

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