22 



F.R. WANLESS AND R. HUNTER 



Distribution and habitat. Cosmopolitan, prefers dry ground, 

 but also mentioned from freshwater. 



REMARKS. These specimens agree with descriptions of this species 

 by Thome (1937) and Rashid etal., (1984). Note variation in length 

 of the slender tail terminus and appearance of the lateral field at 

 different focal levels. 



Eucephalobus sp. 



(Fig. 35) 



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



Female, (n = 1 ). L = 430 urn; a = 19.8; b = 3.5; c = 10.2; c'= 3.4; 

 V = 63. tail 42 urn. 



Cuticle 1 .2 urn thick. Annules 1 .6 um wide at mid-body. Lips six, 

 pointed. Lateral field with three lines in region of oesophageal basal 

 bulb, not evident elsewhere. Stoma 12.8 um long, rhabdions indis- 

 tinct. Oesophagus cylindrical, 122 um long. Excretory pore 73.6 um 

 from anterior end, hemizonid not seen. Reproduction system 

 monodelphic, prodelphic. Ovary with double flexure. Egg 38 um 

 long by 16 um wide. Spermatheca not seen. Postuterine sac 9.6 um 

 long. Vulva protruding. Length of vagina about one quarter of vulval 

 body width. Rectum 10.2 um long, or 0.8 times anal body width. Tail 

 terminus without distinct annules, broadly spear-shaped. Phasmid 

 not evident. 



Remarks. The distinctive spear-like tail terminus of this female is 

 not known to occur in other species of Eucephalobus and this 

 specimen may represent a new taxon. It cannot however, be described 

 until additional material becomes available for study. 



Acknowledgements. This work was made possible by the financial 

 support of The Natural History Museum, London and by sponsorship of the 

 all-documentory television station The Discovery Channel under the aus- 

 pices of Project Urquhart. Additional support was provided by Simrad, the 

 electronics company which was the main sponsor of the hydrological survey 

 of the loch. Special thanks are due to Mr Nicholas Witchell, the founder and 

 Chairman of Project Urquhart. We also thank the crew of the research vessel 

 Soel Mara who's skills contributed greatly to the success of the profundal 

 coring programme. The late Professor M. W. Brzeski. Museum and Institute 

 of Zoology, Polish Academy of Sciences. Warszawa, Poland kindly read 

 through early descriptions of these nematodes and his comments are greatly 

 appreciated. Several of our colleagues also deserve many thanks; Nicola 

 Mitchell gave invaluable help assisting with field and laboratory work; DrT, 

 J Ferrero produced the map of Loch Ness and 'sorted' many of the word 

 processing problems encounted by the first author. Translation of various 

 German and Dutch texts by Dr R. Huys is also gratefully acknowledged. 



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