Heligmonina kotoensis, Diouf & Daouda & Durette-Desset, 2005

Diouf, Malick, Daouda, Is-Haquou & Durette-Desset, Marie-Claude, 2005, Two new species of Nippostrongylinae (Nematoda, Trichostrongylina, Heligmonellidae), coparasites of Mastomys natalensis (Muridae, Murinae) from Benin, Zoosystema 27 (1), pp. 27-35 : 29

Heligmonina kotoensis n. sp.

( Fig. 1 )

TYPE MATERIAL. — Holotype, allotype, 15. VI.2001, I. A. H. Daouda coll. ( MNHN 668 KQa) . Paratypes: 15. VI.2001, I. A. H. Daouda coll., 10, 10 ( MNHN 668 KQb) ; 21, 17 ( ZIT / IFAN 01 I), coparasites of Neoheligmonella lamaensis n. sp .

ETYMOLOGY. — After Koto: the name of the forest vil-

New Trichostrongylina (Nematoda) from Benin

TYPE LOCALITY. — Koto, Republic of Benin.

HOST. — Mastomys natalensis (Smith, 1834) ( Muridae , Murinae).

SITE. — Small intestine (SI 1-SI 2).

DESCRIPTION

Small nematodes with body uncoiled or slightly coiled along ventral side. Excretory pore situated about at mid-region of oesophagus. Deirids posterior to excretory pore and very distant from it ( Fig. 1A ). Vestibule twice as long as sphincter. Uterus very short less than 18% of body length.

Synlophe (studied in one male and one female paratypes)

In both sexes, cuticule bearing longitudinal, uninterrupted ridges, all appearing at different levels between cephalic vesicle and end of muscular oesophagus and disappearing anterior to caudal bursal in male. In female, ventral ridges disappearing anterior to vulvar opening, dorsal ridges posterior to vulva. Number of ridges: 11 (six dorsal, four ventral and left hypertrophied) at mid-body ( Fig. 1B, C ). Double gradient of size decreasing from left to right on ventral side, and from right to left on dorsal side ( Fig. 1B, C ). In both sexes, tips of ridges orientated from right to left with axis of orientation inclined at about 70° to sagittal axis ( Fig. 1B, C ). In vulvar region, ridges orientated perpendicularly to body ( Fig. 1G ).

Holotype male

2.0 mm long, 150 μm wide. Cephalic vesicle 43 μm long, 26 μm wide. Nerve ring, excretory pore and deirids situated at 75 μm, 80 μm and 130 μm from apex, respectively. Oesophagus 225 μm long, with anterior muscular part 85 μm and posterior glandular part 140 μm ( Fig. 1A ).

Figures

FIG. 1. — Heligmonina kotoensis n. sp.; A, male, anterior extremity, ventral view; B, C, transverse sections at mid-body; B, male; C, female; D, female, posterior part, left lateral view; E, male, genital cone, ventral view; F, male, caudal bursa, ventral view; G, female, transverse section of body anterior to vulvar opening. Abbreviations: r, right; v, ventral side. Scale bars: A-D, G, 50 μm;