16 



F.R. WANLESS AND R. HUNTER 



Fig. 22 Helicotylenchus pseudorobustus (Steiner, 1914). A-C, female. 

 A, anterior region; B, tail; C, habitus. Scale bars a = 10 urn, b = 100 pin. 



Second-stage juvenile, (n = 1). L = 403 pm; a = 26.8; b = 6. 1 ; 

 c = 9.8; c' = 4.0; tail 40.9 pm.. 



Head not offset from body with two faint post labial annules. 

 Cuticular annulation distinct but fine, about 0.9 pm at mid-body. 

 Lateral field with four lines, the outer ones finely crenate and giving 

 the impression of two vague additional lines in the post oesophageal 

 region. Spear slender. 11.5 um long with small backward-sloping 

 knobs. Dorsal gland opening 2.5 um behind spear knobs. Length of 

 oesophagus (from anterior to base of median bulb) 65.3 um; median 

 bulb ovoid. Excretory pore 75.8 um from anterior. Hemizonid not 

 seen. Tail with rounded tip; phasmid not seen; Length of hyaline tail 

 terminus 12.1 um. 



Distribution and habitat. Reported from Belgium, France, 

 Germany, Poland, Russia and the United Kingdom (Karssen & Van 

 Hoenselaar, 1998). Infective, migratory second-stage juveniles have 

 been found in a wide variety of soils including dunes; adults are 

 commonly associated with roots of vegetable and herbaceous crops 

 (Jepson, 1987). 



Remarks. Although the hemizonid and phasmids could not be 

 seen, this second-stage juvenile is otherwise in close agreement with 

 descriptions of M. ardenensis. 



Meloidogyne kralli Jepson, 1983 



(Fig. 24) 



MATERIAL examined. Foyers Plateau: 159 m; core 14, second- 

 stage juvenile. 



Second-stage juvenile, (n = 1). L = 435 um; a = 3 1 .7; b = 7; c 

 = 6.7; c' = 6.8; tail 64.6 pm. 



B 



'"■•. 



Fig. 23 Meloidogyne ardenensis Santos, 1968. A-D. second stage 

 juvenile. A, anterior region; B, tail; C, lateral field; D, habitus. Scale 

 bars a = 10 um. b = 50 pm. 



Fig. 24 Meloidogyne kralli Jepson. 1983. A-D. second stage juvenile. A, 

 anterior region; B, lateral field; C, tail; D, habitus. Scale bars a = 10 pm, 

 b= 100 pm. 



