QUINTA CONTRIBUCION AL CONOCIMIENTO DE LA PARASITOLOGIA DE RANA MONTEZUMAE RESUMEN: CLAVE DE LAS ESPECIES DEL GENERO CEPHALOGONIMUS Y DESCRIPCION DE UNA NUEVA ESPECIE. (Trematoda)

Resumen

The present work constitutes the fifth part of the contributions to the knowledge of the parasitology of Rana montezumae. A revision of the genus Cephalogonimus together with the description of a new species and key to all of the species have been made.
Moghe in 1930, on describing a new species of Cephalogonimus, grouped the species then described in a key, taking as a basis the location of the testicles, the presence or absence of the esophagus and the size of the suckers; in 1932 Pande placed the genus Cephalogonimus in the family Lepodermaitidae, described two new species and formed a new key, taking as his characters the location of the testicles, however he did not include in his key the especies, Cephalogonimus brevicirrus Ingles, 1932. The third key to the species of this genus was made by the Japonese helminthologist Ogata, who took the same characters as Moghe, but forgot to include the species described by Ingles and Pande.
We, upon forming our key, have considered only the size of the suckers, a character that we believe to be most stable, since the testicles and the absence or presence of the esophagus can be due to constant changs in the metabolism of the animals and to the methods of observation.
The new species described possesses some slight similarities with Cephalogonimus amphiumae, in the size and disposition of the testicles but differs in the other characters that are taken as a basis of classification.
In 1921 MacCallum described as Cephalogonimus trachysauri a species that he found in the intestine of an Australian reptile. Chandler does not accept, and rightly , the species of MacCallum, and Moghe and Pande are of the same opinion as the American investigator.
In accord with Chandler, this species of MacCallum should be transferred to another genus since some of the generic characters of Cephalogonimus are the location of the genital pores, the arrangement of the testicles and the ovary and the similarity of the suckers, all being characters not found in Cephalogonimus trachysauri. We have believd it pertinent to reproduce the drawing that MacCallum made of this species in order to compare it with the type species.
In 1932, T. T . Johnston places it definitely in the genus Paradistomum and species maccallumi.