Labiobulura (Archeobulura) leptomyidis, Smales, Lesley R., 2006

Smales, Lesley R., 2006, Helminths of the Hydromyini (Muridae: Hydromyinae) from Papua New Guinea with the description of a new species of Labiobulura (Nematoda: Ascaridida), Zootaxa 1332, pp. 57-68 : 63-65

Labiobulura (Archeobulura) leptomyidis n. sp.

( Figs 1–13 )

Type Host: Leptomys ernstmayeri Rümmler, 1932

Type locality: Kawaya Village, Waruma Mountain, Milne Bay Province (9º 53'S, 149º 22'E), Papua New Guinea

Site in host: caecum

Date of collection: between 7 August 1992 and 7 September 1993 by P. German.

Type material: Holotype male SAM AHC 33916; Allotype female SAM AHC 33917; Paratypes SAM AHC 33915, AM W.30078, W.30065, W.30079, W.30080, W.30081.

Other material: from Leptomys ernstmayeri 10 males, 3 females from Munimum Village, Milne Bay Province (9º 53'S, 149º 23'E), coll. P. German between 11 August 1992 and 7 September 1993. From Leptomys elegans Thomas, 1897 3 males, 8 females from Iana River, west of Agaun (9º 87'S, 149º 35'E) coll. A. Englisi, 13 March 1985.

Etymology: The specific name is taken from the host genus name.

Description: Cuticle with fine annulations and fine longitudinal striations extending posteriorly from base of cervical alae. Cervical alae prominent, extend to base of oesophagus. Mouth opening, circular in outline, bounded by 6 simple lips, 4 submedians each with double papillae, 2 laterals with amphids. Inner circle of 6 smaller papillae not observed. Buccal capsule circular in cross section, with fine transverse ridge at about 1/2 its length; separating anterior part of buccal capsule from pharyngeal part. Pharyngeal lobes, cuticularized, 3 smaller pointed chordal lobes, 3 larger bifid radial lobes freestanding, project anteriorly into buccal cavity, neither helical nor spiral. Peripheral lobes forming shallow cup for chordal and radial lobes. Oesophagus widens gradually to posterior oesophageal bulb, about 1/8 body length. Nerve ring surrounds anterior oesophagus, excretory pore posterior to nerve ring.

Male: (Measurements of 10 specimens) Length 9–12 (10.2) mm, width 210–335 (311). Buccal capsule 40–67 (55) long. Oesophagus 1000–1360 (1220) long; bulb 168–234 (200) wide. Nerve ring 270–340 (310), excretory pore 415–535 (475) from anterior end. Spicules similar, slender, with pointed tips 1900–2145 (2005) long. Gubernaculum with sides extending anteriorly, 140–215 (170) long. Tail 160–235 (195) long. Sucker pre-cloacal, elongate without cuticular elaborations; 11 pairs caudal papillae; 3 pairs pre-cloacal, 2 pairs at level of cloaca, 6 pairs post-cloacal.

Female: (Measurements of 10 specimens) Length 9–14 (11.3) mm, width 280–380 (320). Buccal capsule 45–56 (49) long. Oesophagus 1150–1360 (1325) long; bulb 168–228 (215) wide. Nerve ring 265–330 (310), excretory pore 495–560 (525) from anterior end. Vagina opens 3825–5140 (4500) from anterior end. Tail conical, with pointed tip 480–590 (535) long. Eggs thin-shelled, sub-globular 64–70 (68) by 47–60 (53), embryonate in utero.

Figures

FIGURES 1 – 13. Labiobulura leptomyidis n. sp. 1. Anterior end, lateral view. 2. Cephalic end, lateral view. 3. Cephalic end, optical section, lateral view showing pharyngeal lobes. 4. Buccal capsule, en face view, showing pharyngeal lobes. 5. Cephalic end, hand cut sagittal section, dorsoventral view showing pharyngeal lobes. 6. Oesophagus, transverse section showing lateral alae. 7. Cephalic end, en face view. 8. Gubernaculum, lateral view. 9. Posterior end male, ventral view showing gubernaculum. 10. Posterior end male, lateral view showing sucker. 11. Spicule tip. 12. Posterior end female, lateral view. 13. Vagina. Scale bars: 1 = 150 Μm; 2, 3, 5 & 13 = 50 Μm; 4, 6, & 7 = 20 Μm; 8 & 11 = 25 Μm; 9 = 75 Μm; 10 = 200 Μm; 12 = 100 Μm.