NEIHPID

Oesophagostomum (Oesophagostomum) dentatum (Molin Molin) Rudolphi 1803 Back

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Taxonomy

Nematoda »
        SECERNENTEA »
              Chabertiidae (Popova, 1952) Lichtenfels, 1980 »
                     Oesophagostominae Railliet, 1916 »
                            Oesophagostomum Molin, 1861 »
                                    Oesophagostomum (Oesophagostomum) dentatum (Rudolphi 1803), Molin 1861

Synonyms

(Strongylus dentatus Rudolphi, 1803; Oesophagostomum subulatum Molin, 1861)

Host

Sus (scrofa domestica)

Habitat

Large intestine, colon

Locality

Shillong (Meghalaya), Nongstoin (Meghalaya), Markasa (Meghalaya), Riangdo (Meghalaya), Jowai (Meghalaya)

Description

General

Mouth directed straight forwards. Cuticle with well-marked transverse striations throughout length of body. Cervical or lateral alae absent. Pair of cervical papillae symmetrically placed behind middle of oesophagus, possessing bristle-like terminations. Two corona radiatae present - external projecting beyond oral aperture, with nine elements, one pair displaced on either side of oral aperture, five closely packed together with pointed endings; internal having eighteen elements. Mouth collar with two lateral and four sub-median head papillae which project forward conspicuously. Ventral cervical groove near anterior end, extending around ventro-lateral aspects of body; cuticle anterior to groove dilated to form prominent cephalic vesicle, anteriorly beginning at base of mouth collar. Buccal capsule shallow, uniformly cylindrical, oesophagus club shaped, with prominent bulb at its posterior end.

Male

Body 8.0-9.5 mm in length, 0.33-0.45 mm in maximum width. Bursa well developed having bursal rays; ventral ray cleft; medio-laterals and postero-laterals fused proximally, somewhat divergent from antero-lateral ray; externo-dorsal arising from common trunk with dorsal ray; latter divided into two divergent terminal branches, each of which gives off a short lateral twig. Spicules equal, alate with blunt tips. Gubernaculum present.

Female

Body 8.0-13.0 mm in length, 0.45-0.62 mm in maximum width. Tail tapering to sharp point. Vulva little anterior to anus. Ovejector single, J-shaped characteristically laden with three mature eggs; uterine branches parallel, entering ovejector at its opposite ends. Eggs thin shelled, segmented, 0.05-0.055 x 0.027-0.03 mm.

Remarks

The genus Oesophagostomum Molin,1861 was divided by Railliet and Henry in 1913 into three sub-genera, and the present species was accommodated in sub-genus  Oesophagostomum (Oesophagostomum)  Molin,1861 mainly on the basis of the shape and degree of development of the oesophageal funnel.

The species closely resembles in general appearance with O. quadrispinulatum (Marcone,1901) Alicata,1935 also parasitizing the same host in India, only the shape of the oesophagus (oval) and the tail length (comparatively short) differentiate the present species from the latter species, in which the oesophagus has a small but distinct swelling at its anterior end.

Helminthological collections record

NEHU/Z - NM/10

References

Railliet, A. and Henry, A. (1913). Sur les oesophagostomiens des ruminants. Bulletin de la Societe de Pathologie Exotique. 6:pp 506-511.

Molin, R. (1861). Prodromus faunae helminthologicae vehetae adjectis disquisititionibus anatomicis et criticis. Denkschr. Akad. Wissensch. Wiener Math-natürwissenschaftlichen. 19: pp 189-338.

Alicata, J. E. ( 1935) Oesophagostomum longicaudum Goody, 1925, a synonym of Oesophagostomum quadrispinulatum (Marcone, 1901). Journal of Parasitology. 21:pp 215-216.