Dinurus ivanosi sp. nov. (Digenea: Hemiuridae) from the stomach of dolphin fish, Coryphaena hippurus, caught off the Kerala Coast, India.

A new species of stomach fluke, Dinurus ivanosi (sp. nov.), was recovered from the dolphin fish, Coryphaena hippurus, off the Kerala Coast, India. It is similar to other Dinurus species in the plicated prosoma, trilobed seminal vesicle and seven vitellaria, but differs from them in the length of the pharynx, unequal lobes of the seminal vesicle and unequal size of the testes. The most important diagnostic features of the new species are the general shape and proportions of the body, the position of the oral sucker, elongated pharynx, small distal lobe of the seminal vesicle, and larger anterior testis, smaller egg size, short and slender vitellaria and the limited extent of the vitelline field.