TREMATODOS DE PECES DE AGUAS MEXICANAS DEL PACIFICO. XXII ALGUNOS MONOGENOIDEOS DE LA COSTA SONORENSE DEL GOLFO DE CALIFORNIA

Resumen

In the present contribution to the study of Monogenoidea of mexican marine fishes, structures of the opisthohaptor and the male and female reproductive complexes of Paracalceostoma ralceostomoides Caballero y Bravo, 1960, are defined. In the studied specimens, at this time the opisthohaptoral marginal hooks were not seen as in the specimens described in 1960, although we examined the forro of two anchors in the sucker-like.
A new species of Entobdella Blainville, 1818, Entobdella guberleti n. sp. is described; it is different from the other known species, first: the penetration of only one caeca branch into prohaptor, which forros an open collar in front of the pharynx and, second: by the structure of the cirrus external portion. The only species of the genre which resembles our specimens is Entobddla corona Hargis, 1955, because of the presence of the pretesticular spermatic organ, but by the rest it is quite different. The third species, Choricotylc sonorensis n. sp., differs from
Choricotyle caulolatili ( Meserve, 1938) Sproston, 1946, in the structure of the prohaptor and opisthohaptor and in the number and form of the genital clise hooks. For these same characteristics it is different from the species Choricotyle Beneden and Hesse, 1863, described by G. A. MacCallum (1917); E. Linton (1940); H. F.ujii (1944)
and by W. J. Hargis (1955) all of them found in fishes of the Atlantic and North-American coast of the Gulf of Mexico.