鶏に寄生する方形絛虫の中間宿生としての蟻について
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概要
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This study was made with the view of investigating the life history of Raillietina tetragona. So far as the authorknows, the two species of ants, Tetramorium caespitum and Pheidole vinelandica, have been only considered to be an intermediate host of R.tetragona. Last year the author found that Onthophagus ater WATERHOUS could become an intermediate host of the said tapeworms. This year the author found a large number of ants living inside and outside the chicken yards carrying to their nests many segments of the tapeworms. So after having examined whether the ants were infected with cysticercoids or not, the author found that a small dark brown species, Pheidole fervida F.SMITH inside of the yard and a small brown form, Tetramorium caespitum subsp. jacoti WHEELER outside of the yard were infected with a considerable number of cysticercoids？E The latter were infected to the extent of 0.86% and the former, inside of the two different yards, to the extent 2.3% and 2.06%, respectively. The cysticercoids were approximately elliptical in shape with the larval scolex invaginated into the bladder and entirely surrounded by a heavy cyst wall. Neither caudal appendage nor embryonal hooks were observed on any of the specimens examined. The larvae were filled with calcaresus corpuscles which masked the internal structure. In general the cysticercoids (Fig.1) infected in Pheidole fervida F.SMITH arelarger than those (Fig.2) of Tetramorium caespiturn subsp. jacoti WHEELER. Both cysticercoids which infected in the two species of ants were only mature cysticercoids and the developing stage of them were not found. The author found that the tapeworms had infected up to 100%, when the author killed young white Leghorn cocks and cut out their small intestine, 20 days after being fed them on cystcercoids taken out of the abdominal cavity of these ants. Control birds kept with the experimental birds proved to be negative upon the post-morten examinations. From this the author found that the two above-mentioned species of ants could be an intermediate host of Raillietina tetragona.
- 奈良學藝大學の論文
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