| Foreword | |
| Preface | |
| Systems and classifications | |
| Systematics and taxonomy | p. 3 |
| Classification versus system | p. 4 |
| Biological classifications from Andrea Cesalpino to the New Systematics | p. 5 |
| Evolutionary systematics | p. 7 |
| Numerical taxonomy | p. 7 |
| Hennig's phylogenetic systematics | p. 8 |
| Contrasting systematic schools | p. 9 |
| Towards a natural system of living organisms | p. 11 |
| Some steps in comparative biology | |
| Characters as 'symptoms' for recognizing taxa | p. 15 |
| Characters for choice | p. 16 |
| Homology | p. 18 |
| Homoplasy | p. 23 |
| Character coding | p. 24 |
| Monophyly, paraphyly, polyphyly | p. 25 |
| Determining character polarity | p. 28 |
| Cladograms and trees | p. 32 |
| Numerical methods for the reconstruction of phylogeny | p. 33 |
| Ancestors | p. 37 |
| Fossils and cladistic analysis | p. 38 |
| Grouping and ranking | p. 39 |
| Phylogeny versus adaptation | p. 42 |
| Biochemical and molecular systematics | |
| Micromolecules | p. 44 |
| Macromolecules | p. 46 |
| The species | |
| Species concepts | p. 62 |
| Taxonomic diversity within the species | p. 72 |
| Hybrids | p. 75 |
| Speciation | p. 76 |
| Resources and media | |
| Human resources | p. 87 |
| Institutions | p. 89 |
| Literature | p. 92 |
| Nomenclature | p. 96 |
| The inventory of natural diversity | |
| How many species do we know? | p. 107 |
| Continuing discovery | p. 125 |
| How many species are still to be discovered? | p. 126 |
| Towards the system | |
| Kingdoms and phyla | p. 130 |
| 'Prokaryotes' | p. 133 |
| The major groups of eukaryotes | p. 135 |
| Fungi | p. 137 |
| 'Protists' | p. 139 |
| Metazoans | p. 140 |
| Placozoans | p. 142 |
| Sponges | p. 142 |
| Cnidarians | p. 143 |
| Ctenophorans | p. 144 |
| Platyhelminths | p. 144 |
| Gnathostomulids | p. 145 |
| Mesozoans | p. 145 |
| Aschelminths | p. 145 |
| Pogonophorans | p. 146 |
| Annelids | p. 147 |
| Molluscs | p. 148 |
| Arthropods, excluding insects | p. 149 |
| Insects | p. 153 |
| Onychophorans, tardigrades and pentastomids | p. 154 |
| Bryozoans, brachiopods and phoronids | p. 155 |
| Deuterostomes, excluding chordates | p. 155 |
| Chordates, excluding vertebrates | p. 156 |
| Vertebrates | p. 157 |
| Green plants, excluding angiosperms | p. 164 |
| Angiosperms | p. 165 |
| Interviews on the daily work of systematists: problems and trends | |
| Specialist groups as natural groups | p. 168 |
| Genera | p. 169 |
| Species | p. 173 |
| Infraspecific taxa | p. 176 |
| Characters | p. 180 |
| From field work to monograph | p. 182 |
| The unequal distribution of taxonomic diversity | |
| The very large genera | p. 185 |
| Size distributions of higher taxa | p. 194 |
| Domesticated animals and cultivated plants | |
| Taxonomy and nomenclature of domesticated animals | p. 198 |
| Taxonomy and nomenclature of cultivated plants | p. 202 |
| Some dangerous trends, and a hope for the future | p. 207 |
| App. 1 Zoological checklists and catalogues | p. 215 |
| App. 2 Mohn's (1984) general classification of living organisms | p. 218 |
| App. 3 'Provisional classification' of the Protista, according to Corliss | p. 221 |
| App. 4 Phyla and classes of the Protoctista (Corliss' Protista) according to Margulis et al. (1990) | p. 222 |
| App. 5 Mohn's (1984) classification of animals | p. 224 |
| App. 6 Nielsen's (1985) classification of the Animalia | p. 226 |
| App. 7 Ehler's (1985) system of Plathelminthes | p. 228 |
| App. 8 Jamieson's (1988) system of the Oligochaeta | p. 229 |
| App. 9 Salvini-Plawen's (1980) classification of the Phylum Mollusca | p. 231 |
| App. 10 Haszprunar's (1986) classification of gastropods | p. 233 |
| App. 11 Weygoldt and Paulus's (1979) system of the Chelicerata | p. 234 |
| App. 12 Shultz's (1990) system of the Chelicerata | p. 235 |
| App. 13 Schram's (1986) classification of the Crustacea | p. 236 |
| App. 14 Starobogatov's (1988) classification of the Crustacea | p. 237 |
| App. 15 Hennig's (1969) system of the Insecta | p. 239 |
| App. 16 Hennig's (1985) system of the Chordata | p. 241 |
| App. 17 The major groups of Chordata according to Nelson (1969) | p. 243 |
| App. 18 Rosen et al.'s (1981) classification of gnathostome vertebrates | p. 245 |
| App. 19 Carroll's (1987) classification of vertebrates, including both extinct and living forms | p. 246 |
| App. 20 Lauder and Liem's (1983) classification of living bony fishes | p. 252 |
| App. 21 Sibley and Ahlquist's (1990) classification of birds | p. 253 |
| App. 22 Bremer's (1985) cladistic classification of green plants | p. 262 |
| App. 23 Dahlgren's (1989a,b) classification of the flowering plants | p. 263 |
| References | p. 270 |
| Author index | p. 334 |
| Subject index | p. 346 |
| Taxonomic index | p. 351 |
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