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During an investigation on helminth parasites of birds, a new species of trematode genus Heterotestophyes gibsoni sp. n. was recorded from the intestine of little tern (Sternula albifrons) collected from Jamshoro, Sindh, Pakistan. The new species is characterized by having small body, maximum width attained at the level of mid body region and
twisted at the level of pharynx. Oral sucker terminal, rounded and broader than long. Esophagus long, intestinal bifurcation is above the acetabulum. Ventral sucker muscular, rounded, occupy 2nd. quarter of the body. Testes lie in posterior most region of the hind body, these are Juxta-opposite, rounded in shape. Genital atrium occupies middle of
the body, elongated to rounded in shape, distinctly separated from acetabulum, spines in the crown are 57-60 in number. Ovary pre-testicular, sub median, equal in size to anterior testis. Uterus profuse with loops in hind body, between the genital atrium and anterior testis. Vitellaria follicular, commence at little distance below the genital
atrium, extend up to the hind body above the testes, eggs are oval shaped and double walled.
Bushra Siyal, Sanjota Nirmal Das, Rafia Rehana Ghazi, Aly Khan. (2016) Heterotestophyes gibsoni sp.n. (Trematoda: Heterophyidae) from the bird little tern (Sternula albifrons) in Sindh, Pakistan, Punjab University Journal of Zoology, Volume 31, Issue 2.
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