. Bulletin of the Natural History Museum Zoology. Fig. 33 Diplogasteritus nudicapitatus (Steiner, 1914). A-C. male. A. habitus; B, spicular region; C. oesophageal region. Scale bars a = 20 urn, b = 50 um. MALE. (N =1). L = 637 um; a = 25; b = ; c = ; c' = : gubernaculum = um; spicule = 33 um; tail = 155 um. Head not offset; labial papillae minute. Amphids not seen. Cuticle with ca. 20 prominent longitudinal lines. Annules minute, less than. wide. Oesophagus with large median bulb and smaller basal bulb; 105 um long. Excretory pore 98um from anterior, at mid-level of basal b
. Bulletin of the Natural History Museum Zoology. Fig. 33 Diplogasteritus nudicapitatus (Steiner, 1914). A-C. male. A. habitus; B, spicular region; C. oesophageal region. Scale bars a = 20 urn, b = 50 um. MALE. (N =1). L = 637 um; a = 25; b = ; c = ; c' = : gubernaculum = um; spicule = 33 um; tail = 155 um. Head not offset; labial papillae minute. Amphids not seen. Cuticle with ca. 20 prominent longitudinal lines. Annules minute, less than. wide. Oesophagus with large median bulb and smaller basal bulb; 105 um long. Excretory pore 98um from anterior, at mid-level of basal bulb. Testis anteriorly directed with reflexed tip. Spicula times anal body width. Gubernaculum, distally with two pairs of mound-like swellings (arrowed, fig. 36H). Bursa absent. Nine pairs of caudal papillae; three pairs pre-anal and six post-anal. Distribution and habitat. A common species found in Europe and South Africa in terrestrial and aquatic habitats. Remarks. Morphology and measurements closely agree with the descriptions of D. nudicapitatus provided by Bongers (1988) and Zullini (1982). Eucephalobus oxyuroides (de Man, 1876) Steiner, 1936. (Figs 34, 36E-G) Material examined. Foyers Plateau: 161 m; core 19, 1 ?. River Oich: m; core 36, 19. Females. (n = 2).L = 558, 615 jam; a = , : b = , ; c = ; c' = ; V = , 61: tail 85, um. Cuticle um thick with annules , um wide at mid-body. Lips six, pointed. Lateral fields with three lines ending at level of phasmids. Stoma (n = 1) long, rhabdions distinct. Oesopha- gus cylindrical, 153, 157 um long, basal bulb ovate. Excretory pore (n=l) 91 um from anterior end at level of hemizonid. Reproductive system monodelphic, prodelphic. Reflexed at oviduct. Spermatheca and postuterine sac not seen. Vagina length about one half of vulval body width. Vulva not protruding. Rectum 23, 26 um long or , times anal body width. Tail 80-86um long. Phasmid at 28, 32% of tail le
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