Under Ghiselin-Hull biological individualism, species are historical lineages whose membership is determined by genealogical-causal relations, not by stable qualitative properties.

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Genealogical-causal relations(as used in philosophy of biology): Connections between things based on shared ancestry and the parent-child relationships that caused one generation to come from another.
Ghiselin-Hull biological individualism(as used in philosophy of biology): A scientific theory arguing that species aren't defined by shared characteristics, but rather by their evolutionary history and family relationships—like how humans are human because we descended from common ancestors, not because we all have the same traits.
Historical lineages(as used in evolutionary biology): A chain of organisms connected through time by reproduction, tracing back through ancestors like a family tree.
qualitative properties(Used here to clarify that 'occupying someone's qualitative role' involves matching all qualitative features, not just intrinsic ones): Properties that include both intrinsic properties of an individual and extrinsic properties (such as relational or world-involving properties like being such that there are seven continents), which together suffice to fix the qualitative character of the world

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