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Evolution__3rd_Edition

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..<br />

CHAPTER 11 / The Units of Selection 297<br />

Table 11.1<br />

The modes of development in different groups of living things. In the cellular differentiation column, + means that it is present in all<br />

the species that have been studied in the group and +/– means it is present in some species and absent in others. In the developmental<br />

mode column, s means new organisms can develop from the “somatic” cells of their parent, e means epigenetic development,<br />

p means preformationistic development, and u means unknown. From Buss (1987).<br />

Cellular Developmental Cellular Developmental<br />

Taxon differentiation mode Taxon differentiation mode<br />

Protoctista<br />

Phaeophyta +/− s<br />

Rhodophyta +/− s<br />

Chlorophyta +/− p<br />

Ciliophora +/− s<br />

Labyrinthulamycota +/− s<br />

Acrasiomycota +/− s<br />

Myxomycota +/− s<br />

Oomycota + s<br />

Fungi<br />

Zygomycota + s<br />

Ascomycota + s<br />

Basidiomycota + s<br />

Deuteromycota + s<br />

Plantae<br />

Bryophyta + s<br />

Lycopodophyta + s<br />

Sphenophyta + s<br />

Pteridophyta + s<br />

Cycadophyta + s<br />

Coniferophyta + s<br />

Angiospermophyta + s<br />

Animalia<br />

Placozoa + s<br />

Porifera + s<br />

Cnidaria + s<br />

Ctenophora + p<br />

Animalia (continued)<br />

Mesozoa + p<br />

Platyhelminthes + s, e, p<br />

Nemertina + e<br />

Gnathostomulida + u<br />

Gastrotricha + p<br />

Rotifera + p<br />

Kinorhyncha + u<br />

Acanthocephala + p<br />

Entoprocta + s<br />

Nematoda + p<br />

Nematomorpha + u<br />

Bryozoa + s<br />

Phoronida + s<br />

Brachiopoda + u<br />

Mollusca + e, p<br />

Priapulida + u<br />

Sipuncula + u<br />

Echiura + u<br />

Annelida + s, e, p<br />

Tardigrada + p<br />

Onychophora + p<br />

Arthropoda + e, p<br />

Pogonophora + u<br />

Echinodermata + e<br />

Chaetognatha + p<br />

Hemichordata + s, e<br />

Chordata + e, p<br />

(Section 1.2, p. 6) and the Galápagos finches (Section 9.1, p. 223), to the color patterns<br />

of the peppered moth Biston betularia (Section 5.7, p. 108) and mimetic butterflies<br />

(Section 8.1, p. 195), are all adaptations that benefit the individual organism. It can<br />

hardly be doubted, therefore, that organismal adaptations exist, and natural selection<br />

can favor them.

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