PROGRESS IN PROTOZOOLOGY

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248 D. L. NANNEY among the earliest of the major eukaryotic protists, at least the earliest represented by extant forms. Perhaps the discovery of nuclear compounding provided the first effective means of increasing greatly the size and motility of the eukaryotic organisms. And perhaps these new capabilities permitted an important early radiation. That radiation could conceivably have occurred as early as 1.5 to 1.8 billion years ago, but the time cannot be fixed until more satisfactory data are available for several well-calibrated presumably chronometrie molecules. (3) Tetrahymena pyrijormis is a Complex of Species Remarkably Similar in Certain Features Following Sonneborn's (1937) discovery that Paramecium aurelia is a cluster of sibling species, many named ciliate species have been shown to be species complexes. The first systematic study of the population structure of Tetrahymena pyrijormis was carried out by Gruchy (1955), who found eight genetically isolated species in collections from North America. Elliott and his collaborators continued Species Name Table 1 Some mating groups in the T. pyriformis complex T. thermophila I II III IV V VI VII T. pigmentosa I II III T. canadensis I II III IV V T. thermophila I - + + + + + + _ _ _ ______ (mating group 1) II h + + + + - - - m - + + + + — — — iv - + + + — - — V - + + — - — VI - + — - — VII T. pigmentosa i - + + (mating groups 6, 8) II - + HI — T. canadensis i - + + + + (mating group 7) u - + + + in - + + TV - + v — these explorations, making collections in Central America, the Pacific Islands, Australia and Europe (see Elliott 1973). The general situation is illustrated in Table 1. Each species, once referred to as a "variety" http://rcin.org.pl
Table 2 Mating species of Tetrahymena pyriformis complex . _ Syngen (Mating Number of Mode of Mating Spec.es Name Group) Number Collector Mating Types Type Inheritance _ T. thermophila 1 Elliott and Hays (1953) 7 karyonidal T. americanis 2 Gruchy (1955) 9 synclonal T. borealis 3 Gruchy (1955) 7 karyonidal T. hegewischi 5 Gruchy (1955), Nyberg (1981) 8 unknown T. canadensis 7 Gruchy (1955) 5 karyonidal T. pigmentosa 6,8 Gruchy (1955) 3 synclonal T. tropicalis 9 Elliott and Hays (1955) 5 unknown T. hyperangularis 10 Elliott et al. (1962) 4 synclonal T. australis 11 Elliott et al. (1966) 3 unknown T. capricornis 12 Elliott et al.(1966) 4 unknown T. sonneborni 13 Nyberg (1981) 3 unknown T. nipissingi 14 Nyberg (1981) 3 unknown T. malaccensis 16 Simon (1981, unpublished) i 6 karyonidal http://rcin.org.pl
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POLISH ACADEMY OF SCIENCES NENCKI I
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PROGRESS IN PROTOZOOLOGY Proceeding
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INTRODUCTORY REMARKS This Part II o
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183 In his abstract Mignot (1981) s
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PHYLOGENETIC RELATIONSHIPS AMONG PR
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187 algae by phycologists (Bourelly
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195 The foregoing subdivisions of A
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Page 35 and 36: 209 vine et al. 1980), there is no
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Page 41 and 42: REFERENCES 215 Bardele C. F. 1977:
Page 45 and 46: PROGRESS IN PROTOZOOLOGY Proceeding
Page 47 and 48: THE TAXONOMIC POSITION OF EVGLENIDA
Page 51 and 52: 225 brate cycle in vitro. Further c
Page 53 and 54: 227 could support the development o
Page 55 and 56: 229 for the development of methods
Page 57 and 58: IN VITRO CULTIVATION OF PARASITIC P
Page 59 and 60: Malaria IN VITRO CULTIVATION OF PAR
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Page 63 and 64: 237 Rai Choudhuri A. N.. Chowdhuri
Page 67 and 68: 241 Only those with 9-type 1 fronto
Page 71 and 72: THE MOLECULAR DIVERSITY OF TETRAHYM
Page 73: 247 in eukaryotes. It is about the
Page 83 and 84: Table 8 Percentage of DNA reanneali
Page 85 and 86: 259 pattern; they do confirm our ju
Page 89 and 90: Table 13 Two-dimensional electropho
Page 91 and 92: 265 Cuny M., Milet M. and Hayes D.
Page 95 and 96: MEMBRANE FUSIONS IN PROTOZOA 269 It
Page 97 and 98: Table 1 Characterization of exocyto
Page 99 and 100: Fig. 3. Freeze fractured trichocyst
Page 101 and 102: * 1 ^MBBHBBHBBBBI jgf'- Fig. 5. Tan
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Page 107 and 108: 277 B i 1 i n s k i M., Plattner H.
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Page 111 and 112: 281 structure and cytochemistry of
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Page 123 and 124: 293 Co-Chairman: Jan Kućera, Czech
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295 LIST OF SCIENTIFIC REPORTS for
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LONDON 1965 http://rcin.org.pl
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LENINGRAD 1969 http://rcin.org.pl
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CLERMONT-FERRAND 1973 http://rcin.o
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WARSAW 1981 http://rcin.org.pl
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CONTENTS Introductory Remarks 179 B
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