NEMATODOS PARASITOS DE LOS BATRACIOS DE MEXICO. III CUARTA CONTRIBUCION AL CONOCIMIENTO DE LA PARASITOLOGIA DE RANA MONTEZUMAE

Resumen

Two new genera and one new species of Nematodes from the intestine and peritoneum of Rana montezumae Baird are described in the present work.
The new genus Dibulbiger is characterized by having rhe mouth formed of three lips each one of which is provided with a papilla; vestibule with neither teeth nor a ring; oesophagus cylindrical, long, with an anterior pharynx well developed and two bulbs in its posterior part, the second one of which is spherical.
The male has no caudal alae nor genital sucker-like organ; spicules uniqual, long and finely striated; gubernaculum present; four pairs of preanal papillae, one postanal and two caudal; female with opposite uteri, vulva in the third posterior segment of the animal; oviparous.
In March of 1932, my Professor Isaac Ochoterena and I described, in Volume III, number 1, page 29, of these Annals, as a new species, the filaria of Rana montezumae. Upon revising the work I found that the description did not correspond to any of the genera described by Yorke and Maplestone in their work, " The Nematode Parasites of Vertebrates," and that although the species has many of the characters of the genus Foleyella, the differences are so great as to induce me to create the new genus Foleyellides having the following characters: cuticle with fine transverse striations; mouth without lips; no papillae on the anterior region nor cuticular formation on the lateral flanges: oesophagus relatively short, in two sections, one anterior, short, and of muscular nature and the other posterior, glandular. Males with caudal alae; with four pairs of well developed papillae, one preanal and three postanal; fine, short, unequal spicules; female amphidelphys; vulva slightly behind the oesophagus; viviparous; microfilariae bearing sheath and found in the blood.
The new species which is described in this work is Spiroxys corti the third of this genus for in 1926 Morishita described one, parasite of a Japonese Amphibian, and years five later Walton described another in an  Amphibian of the United States. These two species mentioned differ from Spriroxys corti in the distribution of the papillae in the male, in the dimensions of the specimens and of the eggs, and in anatomical details such as the structure of the mouth and the location of the vulva.