Bilqees, F.M., Khatoon, N. & Muti-ur-Rehman. (2007). Two species of a new trematode genus Thynotrema (Spirorchiidae: Coeuritrematinae) from the fish Thynnus thunnia of Karachi coast, Pakistan. Int. J. Biol. Biotech. 4 (1): 1-4.

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Bilqees, F.M., Khatoon, N. & Muti-ur-Rehman

2007

Publication

A new trematode genus Thynotrema is described here to accommodate two new undescribes trematodes in the family Spirorchiidae Stunkard, 1921 and subfamily Coeuritrematinae Dwivedi, 1968. The trematodes belonging to the new genus have small, delicate, elongate body, acetabulum smaller than oral sucker, ceca reaching to posterior end of the body, flower- shaped lobed testes, tandem in position, situated near to posterior end of the body. Genital opening is anterolateral or posterolateral to acetabulum seminal vesicle free in parenchyma, tubular or elongated in shape, almost reaching to ovary, cirrus sac is also long terminating posterior to acetabulum or extending anterior to it, metraterm weakly developed or distinct, vitellaria consisting of small follicles, lateral in position, circumcecal posteriorly, between intestinal bifurcation and posterior end of the body. Excretory vesicle is a wide tube extending to level of ovary or posterior testis. The new species Thynotrema elongatum has genital opening posterolateral to acetabulum, seminal vesicle is tubular free in parenchyma and metraterm is weakly developed. Another new species reported here is Thynotrema thynotrema characterized by having genital opening anterolateral to acetabulum, seminal vesicle not tubular but large and elongate, and metraterm is distinct.

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