A General Section -- B Systematic Section -- Gonostomatidae (33 species) -- Kahliellidae (15 species) -- Taxa of Unknown Position in the Non-dorsomarginalian Hypotricha (14 species) -- Supplement to Apourosomoida (5 species) -- References -- Systematic Index -- Table Index
Summary
The present monograph is the fourth of six volumes which review the Hypotricha, a major group of the spirotrichs. The book is about the Gonostomatidae, the Kahliellidae, and some taxa of unknown position in the hypotrichs. Gonostomum was previously misclassified in the Oxytrichidae because its type species Gonostomum affine has basically an 18-cirri pattern, which is dominant in the oxytrichids. A new hypothesis, considering also molecular data, postulates that this 18-cirri pattern evolved in the last common ancestor of the hypotrichs and therefore it appears throughout the Hypotricha tree. T
