Transitional forms are generally lacking at the species level, but they are abundant between larger groups.
Interpretation
Transitional forms in evolution are not typically found within single species but are evident between larger taxonomic groups.
Stephen Jay Gould's quote highlights the observation in evolutionary biology that while specific transitional forms may be rare within distinct species, there is a rich abundance of transitional forms when considering broader categories of life. This underscores the complexity of evolutionary processes and the idea that evolution is not a linear progression but rather a branching tree with diverse pathways between major groups of organisms.
In practice
In a lecture on evolutionary biology, one might cite Gould's quote to discuss the fossil record.
The human mind delights in finding pattern—so much so that we often mistake coincidence or forced analogy for profound meaning. No other habit of thought lies so deeply within the soul of a small creature trying to make sense of a complex world not constructed for it.
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Nothing is more dangerous than a dogmatic worldview - nothing more constraining, more blinding to innovation, more destructive of openness to novelty.
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The heart of the matter, as I see it, is the stark fact that world poverty is primarily a problem of two million villages, and thus a problem of two thousand million villagers.
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Economics profession, they've been - they've been confident in various formulas, but economics is not physics. The same formula that works in one decade doesn't work in the next. Economics is a difficult subject.
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