Enterobius (Colobenterobius) serratus Hasegawa, Matsuo et Onuma, 2003

Hasegawa, Hideo, Frias, Liesbeth, Peter, Surdensteeve, Hasan, Noor Haliza, Stark, Danica J., Lynn, Milena Salgado, Sipangkui, Symphorosa, Goossens, Benoit, Matsuura, Kei- Ko, Okamoto, Munehiro & Macintosh, Andrew J. J., 2020, First description of male worms of Enterobius Colobenterobius serratus Nematoda: Oxyuridae, the pinworm parasite of proboscis monkeys, Zootaxa 4722 (3), pp. 287-294 : 289

Enterobius (Colobenterobius) serratus Hasegawa, Matsuo et Onuma, 2003

(ZooBank registration: urn:lsid:zoobank.org:pub:69E6C6D0-A122-4AB0-AE90-747E941EF26A )

( Nematoda : Oxyuridae : Enterobiinae)

Male (based on 6 males): Body minute, 1.96–2.91 (x̄ =2.54) mm long and 163–178 (172) µm wide in midbody. Posterior end bent ventrally ( Fig. 1 ). Cuticle transversely striated ( Figs. 1, 6 ). Lateral alae single-crested, commencing at level of esophageal bulb and terminating ca. 200 µm anterior to posterior end ( Figs. 1, 5 ). Cephalic expansion 150–200 (175) µm long by 100–128 (116) µm wide, with inner septa in posterior half. Cephalic end with three lips of almost equal size, forming round head with diameter of 63–70 (68) µm. Lips well set off from body, each with serrated inner margin ( Figs. 2, 4 ). Dorsal lip with two cephalic papillae; subventral lips each with one cephalic papilla and amphidial pore; distance between amphidial pores 44–49 µm (n=2) ( Fig. 3, 4 ). Slots present between lips and pharynx ( Fig. 3 ). Pharynx with specific teeth composed of one large median and three pairs of side projections just beneath each lip ( Figs. 2–4 ). Pharynx 23–35 (30) µm long; esophageal corpus 255–285 (271) µm long by 51–65 (58) µm wide with dark granules in posterior half; esophageal isthmus short, 5–10 (7) µm long by 21–25 (23) µm wide; esophageal bulb valved, 95–113 (102) µm long by 83–103 (90) µm wide ( Fig. 1 ). Distance from cephalic apex to nerve ring 158–170 (165) µm and excretory pore 534–750 (662) µm. Testis extending to middle of body ( Fig. 1 ). Spicule thin, slender, with ellipsoid light-refractile mass basally; distal portion pointed, slightly bent ventrally, 227–248 (241) µm long (n=4) ( Fig. 6 ). Spicule portion inside body housed in spicular pouch with paired muscular bands ( Figs. 6, 7 ). Caudal papillae comprised of four pairs: 1 st pair large, pedunculated, projecting laterally at level of anus; 2 nd and 3 rd pairs slightly posterior to 1 st pair, mostly flat, directing ventrally, surrounded by transparent cuticular thickenings; 4 th pair pedunculated, smaller than 1 st pair, directing posterolaterally ( Figs. 6, 8 ). Phasmids arising from anterior base of 4 th papillae, directing laterally ( Figs. 6, 8 ).

Figures

FIGURES 1–8. Male adult of Enterobius (Colobenterobius) serratus Hasegawa et al., 2003, collected from the feces of Nasalis larvatus in Sabah, Malaysia. 1. Entire worm, left lateral view; 2–4. Cephalic extremity, left lateral view (2), optical frontal section (3) and apical view (4); 5. Lateral ala in cross section through midbody; 6. Caudal extremity, left lateral view; 7. Spicular pouch, cross section; 8. Caudal papillae arrangement, ventral view. Abbreviations used: am. amphidial pore; an. anus; ce. cephalic expansion; co. corpus (of esophagus); cp. cephalic papilla; dl. dorsal lip; eb. esophageal bulb; ep. excretory pore; in. intestine; is. isthmus (of esophagus); la. lateral ala; mo. mouth; nr. nerve ring; pd. phasmidial duct; p1–p4. caudal papillae arrangement; ph. pharynx; sl. slot; sp. spicule; ss. specific structure (teeth) of pharynx; sv. seminal vesicle; svl. subventral lip; t. testis; vd. vas deferens.