Vol 27 No 2 December - The Indian Society for Parasitology

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Journal of Parasitic Diseases Vol. 27 (2) Dec. 2003, pp. 124-125 On a new species of the genus Hexacanalis Perrenoud (1931) from the spiral valve of Dicerobatis erregoodoo HEMLATA WANKHEDE University Department of Zoology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad - 431 004 The present communication deals with a new species of the genus Hexacanalis Perrenoud (1931) vzi. Hexacanalis govindi n.sp. collected from spiral valve of Dicerobatis eregoodoo. The species differ from all other known species of the genus in having scolex oval, compressed on all sides, the testes are of medium size, oval in shape, pre-ovarian 20 in numbers, cirrus pouch medium, short, oval, cirrus is coiled, ovary 'U' shaped, compact, vagina is thin tube, the viteilaria are follicular in single row. KEY WORDS : Cestode, Hexacanalis, Marine fish, Trygon Short Communication he genus Hexacanalis Perrenowd (1931) was Trecorded by Southwell (1911) as cephalobothrium with its type species C. abruptum from Pteroplates micura and Dasybatus kuhli at Ceylon (Trivandum coast) and he also reported another species C.variabilis from Pristis cuspidatus and Dasybatus kuhli at Ceylon. Perrenowd (1913) synomysied these species and created a new genus Hexacanalis with its type species H. abruptus and the name H. variabilis was proposed for C. variabilis. He recorded the genus from the same locality (Ceylon). Shinde and Deshmukh (1979) reported two new species i.e. H. zugei and H. Yamaguti from Trygon zugei and Dicerobatis eregoodoo from Ratnagiri and Hexacanalis govindi n.sp. A - Scolex B - Mature Segment Veraval (West coast of India) respectively. Shinde et al (1982) added two new species i.e. H. trygoni and H. ratnagirensis from Trygon zugei Later on Murlidhar (1986) added one new species i.e. H. indraji from Trygon sephen at Kakinada (A.P.) East coast of India. Fifteen specimens of the cestode parasites were obtained from the spiral valve of Dicerobatis eregoodoo, at Veraval, Gujarat (West coast of India). The worms were collected washed and fixed in 4% formalin, stained with Harris haematoxylene, dehydrated cleared in xylene, mounted in Canada balsum. Drawings were made with the aid of Camera lucida, identification was carried out with the help of systema Helminthum Vol-II (Yamaguti, 1960) all measurements are in millimeters. Hexacanalis govindi n.sp. Measurements in mm Organs Length Width Scolex 0.514 0.610 Sucker 0.270 0.145 Neck 0.329 0.164 to 0.106 Mature segment 0.853 0.388 Testes 0.106 to 0.062 0.062 to 0.485 Cirrus pouch 0.121 0.081 Cirrus 0.265 0.014 Vas deferens 0.101 0.009 Genital pore 0.043 0.019 Ovary 0.270 to 0.200 0.072 to 0.0029 Vagina 0.450 0.0009 Ootype 0.052 0.052 Vitellana 0.101 to 0.032 0.033 to 0.019
JPD : Vol. 27 (2), 2003 Genus Hexacanalis Perrenoud 125 Diagonosis and Relationships Prof. G.B. Shinde who has contributed a lot in the field 1. The worm under discussion differs from H. of Cestodology. abrupts which is having the scolex 1.3 X 1.2, ACKNOWLEDGEMENT neck absent, testes 62 to 73 in number, 40 to 45 on The author is thankful to Head, Department of aporal side and 22 to 28 on poral side, ovary Zoology, Dr. Babasaheb Ambedkar Marathwada dumb-bell shaped, without acini, rsceptaculum University. Aurangabad for providing necessary seminis present and vitellaria follicular with facilities during this work. constant globular acini. 2. The present cestode differ from H. zugei which is REFERENCES having the testes 42 to 47 in number almost in two Murlidhar A. 1986. A new species Hexacanalis indraji n.sp. (Lecanicephallidae) from a marine fish Trygon sephen at fields, in 3 to 4 rows, large, ovary single mass, Kakinada (East coast of India). Indian Journal of small, oval compact, genital pores at middle of Helminthology vol. XX-XVIII (2): Sept. 1986 pp. 151-156. the segment and vitellaria granular, subcorticular Perrenowd W. 1931. Recherches anatomiques at histologiques sur with wide strip. quelques cestodes de sclaciens. Rev. Suissezool 38: 469-555. 3. The present worm differs from H. ratnagiriensis Shinde GB & Deshmukh RA. 1979. On two new species of having scolex 0.5 x 0.91, testes 35 in number, in Hexacanalis Perrenowerd, 1931 (Cestoda : Lecanicephalidea) from marine fish. Marath. Univ. J. Sci. Vol. XVIII No. II: 133- two lateral fields (18 in poral and 17 in aporal 139. side), ovary single mass, roughly quadrangular, Shinde GB, Mohekar AD and Sarwade DV. 1982. Two new species compact, vagina posterior to cirrus pouch and of genus Hexacanalis Perrenoud. 1931 (Cestoda : vitellaria granular with wide strips. Lecariicephalidae) from Trygon zugei Muller and Henie and T. In the view of differences, the present form is regarded sephanis (Cuvier) from Arabian sea west coast of India. here to constitute a new species for which the name Yamaguti S. 1960. Systema Helminthum - Vol. II the cestode of vertebrates. Interscience Publ. New York and London, 1-860. Hexacanalis govindi n.sp. is proposed in honour of Ex.
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Vol 27 No 2 December - The Indian Society for Parasitology

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