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Boletín chileno de parasitología

versión impresa ISSN 0365-9402

Bol. chil. parasitol. v.55 n.1-2 Santiago ene. 2000 

Note on Dujardinascaris cybii Arya and Johnson, 1978 (Nematoda: Heterocheilidae) from new host, Mugil cephalus (Linnaeus)

B. Bharatha Lakshmi and M. Sudha

Department of Zoology, Andhra University, Waltair, 530 003, Andra Pradesh, India


Nota sobre Dujardinascaris cybii Arya and Johnson, 1978 (Nematoda: Heterocheilidae) de un nuevo
huésped, Mugil cephalus (Linnaeus)

D. cybii fue obtenido del intestino de M. cephalus, pez de agua dulce, constituyendo el registro de un nuevo huésped. Papilas caudales invisibles en la especie descrita vs 13 pares de papilas caudales sésiles en descripción original.

Key words (Palabras clave): Dujardinascaris cybii; nematode; intestine; Mugil cephalus


In the course of a survey for parasites of freshwater fishes of Visakhapatnam, Andhra Pradesh, India, Dujardinascaris cybii Arya and Johnson 1978, was obtained from the intestine of Mugil cephalus (Linnaeus). M. cephalus represents a new host for Dujardinascaris cybii.


The nematodes were fixed in hot 70% alcohol and preserved in 10% glycerine alcohol. These specimens were cleared in lectophenol for appropriate observations. All measurements are given in millimetres.


Family: Heterocheilidae (Railliet Henry, 1915).
Genus: Dujardinascaris Baylis, 1927
Dujardinascarias cybii (Arya and Johnson, 1978)
Material: 2 males
Host: Mugil cephalus
Location: Intestine
Locality: Visakhapatnam
Number of fish examined: 10
Number of fish infected: 1
Type of specimen: Holotype and paratype, specimens will be deposited in the department of Zoology, Andhra Univesity, Visakhapatnam, A.P. India.

Fig. Dujardinascaris cybii Arya and Johnson, 1978: a) Anterior region of male. b) Posterior region of male.

Worms medium sized, stout and dark brown in colour. Mouth bounded by three lips, without dentigerous ridges. Interlabia present. A tooth pointed out at mouth. Oesophagus long muscular, ventriculus absent. Intestinal caecum well developed, anteriorly directed. Tail slender, pointed with cuticular ring-shaped striations. Cuticle thick, striations prominent.

Male: Body 8 x 0.192 - 0.216. Head diameter 0.048-0.06. Oesophagus 1.476-1.5. Nerve ring at 0.192-0.204 and excretory pore at 0.24 from anterior end. Intestinal caecum 0.864-0.9. Caudal papillae invisible. Spicules equal and chitinized. Caudal alae and gubernaculum absent. Tail


The present species referable to the genus Dujardinascaris, Baylis 1927. Yamaguti (1961) listed two species under the genus Dujardinascaris, D. cenotae (Pearse, 1936) from Rhandia guatemalensis and D. malapteruri Baylis, 1923 from Malapterus electricus. Sood (1988) provided key to the species of Dujardinascaris Baylis 1927 reported from fishes in South Asia. Sood (1988) listed five species under the genus Dujardinascaris, D. magna Khan and Begum, 1971 from Sciaena sp., D. ritai Zaidi and Khan, 1975 from Rita rita, D. quadrii Zubari and Farooq, 1976 from Sciaena sp., D. sciaenae Bilquees, Fatima and Rehana, 1977 from Pseudosciaena diacanthus (=Sciaena) and D. cybii Arya and Johnson, 1978 from Scomberomorus guttatus (= Cybium guttatum), Arya 1980 reported larval forms of D. cybii from the lever, mesenteries and outer wall of intestine from S. guttatus from Jodhpur. The present material resembles Dujardinarcaris cybii Arya and Johnson, 1978 in having a tooth at the anterior end, an oesophagus without posterior ventriculus, well developed intestinal caecum, tail with prominent striations and in some body measurements also. The prsent specimens tally with the principle character of D. cybii except caudal papillae are invisible in the present specimen against 13 pairs of sessile caudal papillae in original description. A detailed examination allowed us to consider the present species as Dujardisascaris cybii.

Acknowledgements.- The authors are thankful to the University authorities and the Head of the Department of Zoology for providing necessary facilities.


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