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Polarity: Since Hennig's own research concentrated on a g r o u p with a poor fossil record, he applied methods of establishing the primitive or derived nature of traits, and hence polarity, among contemporary species. These include outgroup comparison, commonality, and embryological development. Since o u t g r o u p comparison is considered the most useful method, it will be discussed first. An o u t g r o u p includes taxa that are not part of the particular group under consideration, but do share a distant common ancestry.

If the sample contained both juveniles and adults it would include a wide range of dimensions that change with growth, which would misrepresent the adult variation. In many animals, and some plants, species exist in male and female forms which have size differences greater than those between related species. Species which exist in two different forms are said to be dimorphic. Obviously, when collections are being compared to determine morphologic discontinuities, the biologist must be sure that adults are being compared with adults and males with males, or females with females.

And Sokal, R. , 1973, Numerical taxonomy. T h e principles of numerical classification: San Francisco, Freeman, 573 p. 2. , 1966, Phylogenetic systematics: Urbana, Univ. of Illinois Press, 263 p. 3. , 1987, T h e phylogenetic system. T h e systematization of organisms on the basis of their phylogenesis, New York, Wiley, 340 p. SUGGESTED READINGS Blackwelder, R. , 1967, Taxonomy, a text and reference book: New York, Wiley, 698 p. Lazarus, D. , and Prothero, D. , 1984, The role of stratigraphic and morphologic data in phytogeny: Journal of Paleontology, v.

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