Present investigation deals with taxonomic studies of Pseudophyllidean cestode Senga triangulata Sp. Nov. collected from the intestine of Mastacembelus armatus (Lacepede, 1800) at Hadgaon Dist. Nanded (M.S.) India during the period of February, 2011 to January, 2013. Worm comes closer to all known species of this genus in general topography of organs but differs having triangular scolex, narrow anteriorly and broad posteriorly, having pair of bothria, which is sessile, extends from the anterior end to posterior end of the scolex, rostellum oval in shape, armed with single circled 28-30 hooks, neck absent, mature proglottids four to five times broader than long, testes 50-60 in number, pre-ovarian, scattered in two groups, cirrus pouch oval, vagina thin tube, runs posteriorly, ovary bilobed, dumb bell shaped, Gravid proglottids are 5-6 times broader than long, uterus sacular filled with eggs and vitellaria follicular.
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