. Bulletin of the Natural History Museum Zoology. Fig. 18 Tylenchus rex Andrassy. 1979. A-F, male. A. anterior region: B, oesophageal region; C, head region showing amphid; D. lateral field; E, tail and spicular region; G. spicular region. Scale bars a = 20 jam, b = 50 |jm, c = 10 |jm, d = 100 urn. rather than smooth; the tail is longer (160 um vs 130-140 urn); ratio c is lower ( vs ) whereas c' is slightly higher ( vs 7-8). However, these ratios and tail length fall within the range of meas- urements given for T. rex by Brzeski (1996). Tylenchinae sp. (Figs 19, 36C) Material exam
. Bulletin of the Natural History Museum Zoology. Fig. 18 Tylenchus rex Andrassy. 1979. A-F, male. A. anterior region: B, oesophageal region; C, head region showing amphid; D. lateral field; E, tail and spicular region; G. spicular region. Scale bars a = 20 jam, b = 50 |jm, c = 10 |jm, d = 100 urn. rather than smooth; the tail is longer (160 um vs 130-140 urn); ratio c is lower ( vs ) whereas c' is slightly higher ( vs 7-8). However, these ratios and tail length fall within the range of meas- urements given for T. rex by Brzeski (1996). Tylenchinae sp. (Figs 19, 36C) Material examined. Foyers Plateau: 159 m; core 14; 1 9. River Foyers: m; core 42, 1 9. Horizon. Core 14, (1-2 cm). Females, (n = 2). L = 468, 520 urn; a = ,; b = ,; c = , ; c'= 12, ; V = 65,62; V = 80; tail/V-a = ,94; tail = , 104 um. Head not set off, about um wide at base. Amphid apertures not seen. Annules fine about um at mid-body. Lateral fields narrow with two lines. Spear moderately robust, um long with rounded basal knobs um wide; shaft slightly longer than conus. Oesopha- gus 103, 110 um long; median bulb ovate, valve at about 45% of oesophageal length. Excretory pore , um from anterior. Anterior genital branch 115, 109 um long. Spermatheca empty. Postuterine sac not seen, possibly collapsed. Vagina about um long, slightly inclined or curved anteriorly. Tail elongate, not fili- form; tip rounded. Remarks. The generic position of these nematodes is uncertain. They are placed in Tylenchinae because they are close to Tylenchus. Fig. 19 Tylenchinae sp. A-E. female. A. oesophageal region; B. tail: C. lateral field: D. vulval region; E, habitus. Scale bars a = 10 um, b = 100 Um. Bastian, 1865 in which the anterior conus and posterior shaft of the spear are about equal in length. However, the presence of two lines in the lateral fields is not compatible with the generic definition of Tylenchus, which is characterized by th
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