. Bulletin of the Natural History Museum Zoology. Fig. 20 Ditylenchus sp. A-D, male. A, oesophageal region; B, spicular region: C. habitus; D. lateral field. Scale bars a = 20 pm. b = 10 pm. c â â 100 Geocenamus cf. nanus (Allen, 1955) Brzeski, 1991 (Fig. 21) Material examined. River Oich: m; core 31, 19. Female. (n= 1). L = 510pm;a = ;b = ;c = ll;c' = ; V = 54; tail/ V-a = ; tail annules 54; tail = ujn. Head slightly narrower than adjacent body with 5 or 6 fine annules; labial frame work weak. Spear 12 um long with backward- sloping knobs, um wide. Cuticle ann
. Bulletin of the Natural History Museum Zoology. Fig. 20 Ditylenchus sp. A-D, male. A, oesophageal region; B, spicular region: C. habitus; D. lateral field. Scale bars a = 20 pm. b = 10 pm. c â â 100 Geocenamus cf. nanus (Allen, 1955) Brzeski, 1991 (Fig. 21) Material examined. River Oich: m; core 31, 19. Female. (n= 1). L = 510pm;a = ;b = ;c = ll;c' = ; V = 54; tail/ V-a = ; tail annules 54; tail = ujn. Head slightly narrower than adjacent body with 5 or 6 fine annules; labial frame work weak. Spear 12 um long with backward- sloping knobs, um wide. Cuticle annules fine and moderately distinct, about um wide at mid-body. Lateral fields with 6 lines at mid-body, inner lines faint and not always evident throughout the entire length of the lateral fields. Deirid at level of excretory pore. Excretory pore 77 um from anterior. Oesophagus (possibly con- tracted) 80 um long; median bulb ovoid, valve weak at of oesophageal length. Vulva and vaginal structures poorly defined. Genital branches stretched out; anterior and posterior branches do not extend into the oesophageal or anal regions respectively. Phasmids at 40% of tail length. Tail annules continue almost to terminus. Distribution and habitat. Originally described from the Netherlands with further records from Iran, Turkey, Belgium, and Poland. Terrestrial, in soils around roots of various plants (Saltukoglu et ai, 1976); also in meadow and peat soils (Brzeski, 1991a). Remarks. Provisionally identified as G. nanus on account of the number of tail annuli and the value of ratio c'. Other very similar species have fewer tail annules and ratio c' is generally lower, but observed values overlap. For a discussion on relationships between G. nanus (Allen, 1955), G. alboranensis (Tobar Jimenez, 1970) and G. microdorus (Geraert, 1966) see Brzeski (1991a). Tylenchorhynchus sp. Material examined. Fort Augustus Bay: 105 m; Core 7, 1 juvenile. Foyers Plateau: 157 um; core 16. 1 juvenile
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