F.R. WANLESS AND R. HUNTER 



Fig. 3 Coslenchus polonicus Brzeski, 1982. A-F, female. A, oesophageal 

 region; B, lateral field; C, posterior end of reproductive system; D, 

 habitus; E, tail tip; F, tail. Scale bars a = 20 um, b = 100 um. 



elongate, 38, 41 jam long, packed with sperms about 2.0 um in 

 diameter. Distance from vulva to anus 107-128 um. Tail tip finely 

 rounded with annules in one specimen; rounded without discernible 

 annules in other. 



Distribution and habitat. 'Collected in several places in Po- 

 land and in Andreevskoe, Karelia, USSR, always in low peat soil, in 

 small number of specimens' (Brzeski, 1987). 



Remarks. These nematodes were not originally identified as C. 

 polonicus because they have fewer cuticular ridges (18-20 vs 26 in 

 C. polonicus). However, Brzeski (pers. comm.) recognized these 

 females, and suggested they appeared to be C. polonicus. As there 

 are no other significant differences between these females and 

 descriptions of C. polonicus (Brzeski, 1 982, 1 987) it is assumed that 

 the lower number of cuticular ridges lies within the range of varia- 

 tion that might be expected in this species. 



Coslenchus sp. 1 



(Fig. 4) 



Material EXAMINED. Fort Augustus Bay: 92 m; core 4; 1 9. 

 Foyers Plateau: 157 m; core 16; 1 9. 



FEMALES, (n = 2). L = 520, 527 um; a = 23.2, 24.7; b = 5.5, 5.4; c 

 - 5.6, 6.1; c' = 7.2, 6.9; V = 64, 65; V = 77, 79; Rex = 37, 42; Roes 

 = 42, 46; Rv = 136, 138; Rvan = 40, 37; Ran = 59, 53; tail/V-a = 

 0.92, 0.93; tail = 93.4, 86.4 um. 



Head offset in one specimen; 7.0, 7.5 um wide with 4 annules. 

 Annules about 2.6, 2.7 urn at mid-body. Lateral fields with four 

 lines. Cuticle with 14 longitudinal ridges (excluding lateral fields). 

 Spear moderately robust 1 1 .5, 12.8 um long, knobs rounded, slightly 



Fig. 4 Coslenchus sp. 1 . A-E. female. A. oesophageal region; B. lateral 

 field; C, vulval region; D. habitus: E, tail. Scale bars a = 20 um, b = 100 

 um. 



sloping posteriorly, 2.6, 3.0 pm wide. Oesophagus 96.3, 94.7 um 

 long; median bulb ovoid; valve well developed at about 46% of 

 oesophageal length. Vulva with lateral vulval membranes 7.0, 7.6 

 urn or 3 adjacent annules long; vagina perpendicular or slightly 

 inclined anteriorly, with thick walls; postuterine sac not evident; 

 spermatheca without sperm. Distance from vulva to anus 100, 120 

 um. Tail tip finely rounded. 



Remarks. Using Brzeski's (1987) and Geraert & Raski's (1988) 

 keys, these nematodes come close to C. andrassyi Brzeski, 1987, but 

 the mid-body annules are marginally too wide 2.6, 2.7 vs 2. 1-2.5 um 

 in C. andrassyi, also the number of annules between the vulva and 

 the anterior end of the body are too low, 136, 138 vs 157-186 in C. 

 andrassyi. 



Coslenchus sp. 2 



(Fig. 5) 



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



Horizon. Core 40, (1-2 cm). 



Female. (n= l).L = 546pm;a = 24;b = 4;c = 5.4;c' = 7; V = 65; 

 V = 79.5; Rex = 40; Roes = 63; Rv= 152; Rvan = 41; Ran = 66; tail/ 

 V-a= 1.1; tail = 102 pm. 



Head narrower than adjacent body; 7.7 um wide with 5 

 annules. Annules 2.7 pm wide at mid-body. Lateral fields with 4 

 lines. Cuticle with longitudinal ridges and additional short ridges 

 distributed irregularly, giving an estimated total of 15-16 ridges 

 excluding lateral fields. Spear slender, 13.5 pm long; knobs small, 



