. A manual of zoology. Zoology. 2'2 (J mOTOZOA. 22. In conjugation portions of the niicroniicleus are exchanged anil accomplish impregnation. The macronucleus degenerates and is replaced by part of tho fecundated micronucleus. 22. The classification of the Ciliata is based on the structure a]ul arrangement of the cilia. 23. The Ilolotridiu have similar cilia over the whole body. The Heterotriclia have besides the total ciliation stronger cilia in the neighborhood of the mouth (adoral ciliary spiral). The Peri- trirlia have only adoral ciliation. The Ilypotriclia have, on the ventral surface, t
. A manual of zoology. Zoology. 2'2 (J mOTOZOA. 22. In conjugation portions of the niicroniicleus are exchanged anil accomplish impregnation. The macronucleus degenerates and is replaced by part of tho fecundated micronucleus. 22. The classification of the Ciliata is based on the structure a]ul arrangement of the cilia. 23. The Ilolotridiu have similar cilia over the whole body. The Heterotriclia have besides the total ciliation stronger cilia in the neighborhood of the mouth (adoral ciliary spiral). The Peri- trirlia have only adoral ciliation. The Ilypotriclia have, on the ventral surface, the ciliary spiral and rows of cilia and coalesced cilia. The Sudoria have cilia oiily in the young, later they become attached and feed through suctorial tentacles. 24. Spoeozoa are jjarasitie Protozoa, usually without organs of locomotion or mouth. They take no solid food, but live by osmosis on tissue fluids. In reproduction the encysted animals produce spores (apparently always beginning with fecundation and accompanied by a change of host). The spores divide again into sporozoites. Besides, multiplication without change of host (auto- infection) can occur. 25. Tlie Grefjariinda are temporary or permanent parasites in cells. (Spores = ^jseudonavicellaj, sporozoite = falciform embryo). (_'ucridia\ Hamosporida (cause of malaria, parasitic in blood corpuscles). 3G. The )Sarcosj)Orida (liainey's or Miescher's corpuscles of mammalian muscles) and JIj/xosjKiridii (psorospenn capsules of fishes, psorosperm = spore) live in tissues or hollow organs. APPENDIX. According to ihe evolution theory one should expect forms between the Protozoa and Mctazoa. Tlie Catallacta—spheres of ciliated cells which iu reproduction break up into single cells—have been described as such. WSWm-^. iillWlilw Fio. 160.—Section of luilt of Tiichoiilax uiihareiis. (After Schulze.) Peculiar many-celled animals whose position in the system is diflicult to decide are, furtlier, Trifhniilux adha-rena, iSali
Size: 2297px × 1088px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
