20 



F.R. WANLESS AND R. HUNTER 



close to A. cyrtus Paesler, 1957 originally described from mush- 

 room-beds of the Champignonzuchtinstitut Dieskau near Halle, 

 Germany. 



Aphelenchoid.es sp. 3 



(Fig. 31) 



Material examined. River Foyers: 0.22 m; core 40, 1 9. 



Female. (n= 1). L = 813 pm; a = 52;b = 13.4;c= 17.3; c' = 5.2; 

 V = 68; tail = 50 um 



Head region smooth and slightly offset. Cuticle with fine striations 

 about 0.9 jam wide. Lateral fields with four lines, the inner pair 

 indistinct and fading away in some regions. Spear 1 0.8 um long with 

 pronounced basal thickenings. Procorpus of oesophagus hardly 

 visible; median bulb more or less ovoid with well developed valve 

 located slightly posterior to middle of bulb. Excretory pore about 1 .5 

 body widths posterior to median bulb. Vagina directed anteriorly. 

 Anterior genital branch outstretched, about 290 um long. 

 Spermatheca 58 um long with globular sperms. Postvulval uterine 

 sac 123 um also with globular sperms. Anus distinct. Tail concoid 

 with terminal mucro. 



REMARKS. This female is very similar to A. fragariae (Ritzema 

 Bos, 1 890), but differs by having more robust basal spear thickenings; 

 described as minute but distinct in A. fragariae, Siddiqi (1975). 



cf. Caenorhabditis sp. 



(Fig. 32) 



Material examined. River Oich: 0.31 m; core 31, 19. 



Horizon. Core 31 (1-2 cm). 



Female, (n = 1 ). L = 625 um; a = 30; b = 3.9; c = 5.9; c' = 8.6; V 

 = 50; tail = 105 pm. 



Head not offset, 7.0 pm wide with minute labial papillae. Amphids 

 not seen. Cuticle finely annulated; annules about 0.9pm wide at 

 mid-body. Stoma 14.1 pm long; cheilostome distinct, lightly 

 sclerotised, barely setoff from long prorhabdions; metastome with 

 two small denticles. Oesophageal collar not observed. Oesophagus 

 159 pm long with swollen midbulb. Excretory pore not seen. 

 Ovaries paired, anterior branch reflexed. Spermatheca filled with 

 more or less rounded sperms about 2.2 pm.in diameter. Tail straight, 

 tapering to fine tip. Phasmids inconspicuous. 



Remarks. Additional specimens, especially males, are required 

 in order to properly identify this nematode. 



Diplogasteritus nudicapitatus (Steiner, 1914) 



(Figs 33, 36H) 



Material examined. Borlum Bay (1992 collection): 0.38 m; 

 core 4, 1 6\ 



Fig. 31 Aphelenchoides sp. 3. A-E, female. A, anterior region; B, vulval 

 region; C, lateral field; D, tail; E, habitus. Scale bars a = 10 pm, b = 100 

 Jim. 



Fig. 32 cf. Caenorhabditis sp. A-D, female. A, oesophageal region: B, 

 vulval region; C, tail; D. habitus. Scale bars a = 20 pm, b = 50 pm. 



