Ciliates from the cecum of capybara ( Hydrochoerus hydrochaeris) in Bolivia 2. The family cycloposthiidae

Cycloposthiid ciliates in the cecum of five capybaras in Bolivia were surveyed and their morphology and infraciliature was studied using silver impregnation techniques. A new Monoposthium species, M. cynodontum n. sp., a new Cycloposthium species, C. bursa n. sp., and nine known Cycloposthium species, C. incurvum Cunha, 1915, C. hydrochoeri Cunha, 1915, C. lenticularis Hollande & Batisse, 1959, C. minutum Cunha & Muniz, 1927, C. compressum Cunha, 1915, C. elongatum Hollande & Batisse, 1959, C. caudatum Cunha & Muniz, 1927, C. cristatum Cunha & Muniz 1927, in the family Cycloposthiidae, were described. Both density and diversity of the ciliate faunae were extremely high: average values of ciliate density, Brillouin’s diversity index, number of species per host and equitability were 240.0 x 10 4/ml, 2.307,22.4, 74.2%, respectively.