different between intraspecies vs infraspecies

English

From intra- +? species.

intraspecies (not comparable)

Between or among members of a single (taxonomical) species; within a species.
- 2001, National Research Council, Standing Operating Procedures for Developing Acute Exposure Guideline Levels for Hazardous Chemicals,^[1] National Academies Press, ?ISBN, page 66,
  The estimation of the intraspecies variability in dynamics was also based on drug responses in a similar human population.

infra- +? species

infraspecies (plural infraspecies)

An infraspecific name (for a taxon below the rank of species), used informally as a rank in zoology.

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