Species problem  From Wikipedia, the free encyclopedia
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Charles Darwin, On the Origin of Species (p. 48)[1]  The species
problem is a mixture of difficult, related questions that often
come up when biologists define the word "species". Definitions
are usually based on how individual organisms reproduce, but
biological reality means that a definition that works well for
some organisms (e.g., birds) will be useless for others (e.g.,
bacteria).  One common, but sometimes difficult, question is how
best to decide which species an organism belongs to, because
reproductively isolated groups may not be readily recognizable;
cryptic species may be present.   Many of the debates on species
touch on philosophical issues, such as nominalism and realism,
as well as on issues of language and cognition.  The current
meaning of the phrase "species problem" is quite different from
what Charles Darwin and others meant by it during the 19th and
early 20th centuri