. Bulletin of the Natural History Museum Zoology. species of Filenchus, the same range is also given by Karegar & Geraert (1988) in their summary of characters distinguishing F. facultativus from other very similar species, whereas Torres & Geraert (1996) record spear lengths of um in a population described from Argentina. Filenchus thornei (Andrassy, 1954) Andrassy, 1963 (Fig. 8) Material examined. Deep South Basin: 161 m; core 19, 19. River Foyers: m; core 40, 1 2. Foyers Plateau: 159 m; core 14, 1<J. Horizon. cm). Core 14, (2-3 cm); core 19, (1-2 cm); core 40, (2-3 F
. Bulletin of the Natural History Museum Zoology. species of Filenchus, the same range is also given by Karegar & Geraert (1988) in their summary of characters distinguishing F. facultativus from other very similar species, whereas Torres & Geraert (1996) record spear lengths of um in a population described from Argentina. Filenchus thornei (Andrassy, 1954) Andrassy, 1963 (Fig. 8) Material examined. Deep South Basin: 161 m; core 19, 19. River Foyers: m; core 40, 1 2. Foyers Plateau: 159 m; core 14, 1<J. Horizon. cm). Core 14, (2-3 cm); core 19, (1-2 cm); core 40, (2-3 Females, (n = 2). L = 997, 1003 um; a = 38,; b = , ; c = , ; c'= 18; V = 59, 56; V = 73, ; tail/V-a = , ; tail = , um. Head about , um wide at base with 3-4 annules; height about um. Amphids not observed. Annules um wide at mid-body. Lateral fields with four lines, inner lines very faint and not always evident. Spear distinct, moderately slender, , 12 um long with small basal knobs about urn wide. Oesophagus 144- 155 um long; median bulb more or less ovoid, valves moderately distinct at , 42% of oesophageal length. Excretory pore sclerotized at 112, 122 um from anterior. Anterior genital branch 432 urn (n = 1); spermatheca 42 um long, offset. Vagina perpendicu- lar to body axis about um long. Tail tip finely F - Fig. 7 Filenchus facultativus (Szczygiel, 1969). A-G, female. A. oesophageal region; B, head showing amphid; C, posterior end of reproductive system; D, lateral field; E, reproductive system; F, tail terminus; G, habitus. Scale bars a = 10 urn, b = 30 um, c = 100 um. Fig. 8 Filenchus thornei (Andrassy, 1954). A-E, female. A, habitus; B, posterior end of reproductive system; C, tail; D, head region; E, oesophageal region. F, male spicular region. Scale bars a = 200 urn, b = 30 urn, c = 20 Please note that these images are extracted from scanned page images that may have been di
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