PROGRESS IN PROTOZOOLOGY

More documents

Recommendations

Info

20 B. M. HONIGBERG On phylogenetic grounds, Prof. Scholtyseck suggested a divison of the phylum into two subphyla, SPOROZOA and PIRO- PLASMA. Fig. 1. Schematic diagram of a coccidian merozoite showing the diagnostic finestructural characteristics, (a) longitudinal section of the organism, (b) longitudinal and transverse sections of a micropore, (c) a diagram of a conoid. A — amylopectin, C — conoid, DRH — ductule of rhoptry, ER — endoplasmic reticulum, FI — fibril, GO — Golgi apparatus, IM — inner membrane complex, MI — mitochondrion, MN — micronemes, MP — micropore, MT — miirotuibules, N — nucleus, NE — nuclear envelope, NP — nuclear pore, O — opening, OM — outer membrane, P — polar ring, PE — pellicle, PP — posterior polar ring, Ri, R2 — preconoidal rings, RH — rhqptry In their life cycle the organisms belonging to the former subphylum have an encysted zygote, sporocysts in the gregarines and oocysts in the coccidia. Meiosis and sporogony occur in these stages. Therefore, it would be useful to preserve the historical name SPOROZOA Leuckart, 1879 for this subphylum. Since to date the occurrence of gamogony among piroplasms has not been unequivocally proved, this group should be separated from SPO- ROZOA and placed in a new subphylum PIROPLASMA. http://rcin.org.pl
195 The foregoing subdivisions of APICOMPLEXA reflect Prof. S c h o 1t y s e c k's belief that asexual reproduction, i.e., schizogony (or merogony), represents a secondary development in the course of evolution of the phylum found only in the more advanced intracellular SPORO- ZOA. The more primitive gregarines and coccidia have only the sexual reproductive phase. According to the speaker, if one follows his approach to the taxonomy of APICOMPLEXA, the genus Perkinsus Levine, 1978, the sole member of the class PERK<strong>IN</strong>SEA Levine, 1978, is to be considered not as sporozoan, but as an apicomplexan. On the other hand, the members of the order AGAMOCOCCIDIIDA Levine, 1979 do not belong among COCCIDIA Leuckart, 1879. A different approach to APICOMPLEXA was presented by the second speaker, Prof. DESSER. It was his understanding that the name APICOMPLEXA was created by Levine (1970) to replace the older and generally employed name SPOROZOA which included only the gregarines, coccidia, and piroplasms. In addition to possessing the apical complex, as revealed by electron microscopy, the majority of the species belonging to API- COMPLEXA have life cycles that involve gamogony and sporogony; in most instances they include also merogony. The inclusion of the class PERK<strong>IN</strong>SEA Levine, 1978 among API- COMPLEXA (with the single genus Perkinsus Levine, 1978) in the most recent scheme published by the Society of Protozoologists (Levine et al., 1980) is not justified. Admittedly, the zoospores of this peculiar organism possess certain features which superficially resemble the apical complex. These features might have resulted, however, from convergent evolution of organisms of different ancestry and function in a similar manner to enable the parasites to assume their intracellular location. Moreover, these parasites do not undergo sexual reproduction, sporogony, or merogony. Finally, the zoospores of Perkinsus sp. (which are not sexual stages) are biflagellate (Perkins 1976). For those reasons, he felt that the class Perkinsea should be removed from the APICOM- PLEXA and that the original concept of APICOMPLEXA as the equivalent of SPOROZOA, be retained. Prof. Desser felt that not enough information is available at this time to justify definitive decisions with regard to the affinities of the piroplasms. One must agree with him that much evidence was provided during the Sixth Congress in support of this opinion. One of the lines of evidence was the demonstration by Prof. V i v i e r that Dactylosoma ranarum is an eimeriid coccidian rather than a piroplasm. Intraerythrocytic merozoites of these species have a trilaminate pellicle, po- http://rcin.org.pl
Page 1 and 2: POLISH ACADEMY OF SCIENCES NENCKI I
Page 3 and 4: PROGRESS IN PROTOZOOLOGY Proceeding
Page 5 and 6: INTRODUCTORY REMARKS This Part II o
Page 9 and 10: 183 In his abstract Mignot (1981) s
Page 11 and 12: PHYLOGENETIC RELATIONSHIPS AMONG PR
Page 13 and 14: 187 algae by phycologists (Bourelly
Page 19: PHYLOGENETIC RELATIONSHIPS AMONG PR
Page 35 and 36: 209 vine et al. 1980), there is no
Page 39 and 40: 213 evidence for the assumption of
Page 41 and 42: REFERENCES 215 Bardele C. F. 1977:
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
Page 61 and 62: IN VITRO CULTIVATION OF PARASITIC P
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 and 74:
247 in eukaryotes. It is about the
Page 75 and 76:
Table 2 Mating species of Tetrahyme
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Table 8 Percentage of DNA reanneali
Page 85 and 86:
259 pattern; they do confirm our ju
Page 87 and 88:
Page 89 and 90:
Table 13 Two-dimensional electropho
Page 91 and 92:
265 Cuny M., Milet M. and Hayes D.
Page 93 and 94:
PROGRESS IN PROTOZOOLOGY Proceeding
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
Page 103 and 104:
273 the preliminary designation "co
Page 105 and 106:
MEMBRANE FUSIONS IN PROTOZOA 275 ba
Page 107 and 108:
277 B i 1 i n s k i M., Plattner H.
Page 109 and 110:
LIST OF SCIENTIFIC REPORTS presente
Page 111 and 112:
281 structure and cytochemistry of
Page 113 and 114:
283 LIST OF SCIENTIFIC REPORTS A. P
Page 115 and 116:
285 LIST OF SCIENTIFIC REPORTS R. G
Page 117 and 118:
287 LIST OF SCIENTIFIC REPORTS K. G
Page 119 and 120:
LIST OF SCIENTIFIC REPORTS 289 R. A
Page 121 and 122:
291 LIST OF SCIENTIFIC REPORTS magn
Page 123 and 124:
293 Co-Chairman: Jan Kućera, Czech
Page 125 and 126:
295 LIST OF SCIENTIFIC REPORTS for
Page 127 and 128:
PROGRESS IN PROTOZOOLOGY Proceeding
Page 129 and 130:
INTERNATIONAL COLLABORATION AMONG P
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
http://rcin.org.pl
Page 141 and 142:
LONDON 1965 http://rcin.org.pl
Page 143 and 144:
LENINGRAD 1969 http://rcin.org.pl
Page 145 and 146:
CLERMONT-FERRAND 1973 http://rcin.o
Page 147 and 148:
WARSAW 1981 http://rcin.org.pl
Page 149:
CONTENTS Introductory Remarks 179 B
show all

PROGRESS IN PROTOZOOLOGY

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?