Are There Examples of New Species with Minimal Changes in Appearance?

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The discussion centers on the concept of new species defined by taxonomy that exhibit minimal physical changes from their original counterparts, primarily due to reproductive isolation. Examples include organisms like mosquitoes that have diverged enough genetically to prevent cross-breeding while maintaining similar appearances. The conversation also touches on the emergence of new virus species, such as HIV, as instances of speciation events. Participants suggest researching the term "new species by separation" for further insights into this phenomenon. Overall, the topic highlights the complexities of speciation and the nuances of defining new species based on genetic divergence rather than physical characteristics.
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Is there any new species defined by taxonomy (unable to cross-breed, therefore a new species) that has very little change in appearances comparing to the "original species" it deviate from?

For instance, a mosquito separated from the original horde long enough, or due to genetic mutation, which made them impossible to breed with the original horde, but still looks quite the same to the original ones? I hope you got the over all idea.
 
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Here's one... its not that new since it was discovered in 1979...

http://ijs.sgmjournals.org/cgi/reprint/29/2/102.pdf

Just google this "new species by separation" and you'll have a fair gamut of research to do.:smile:
 
If you count viruses as showing speciation events, then there are many examples of new virus emergence. For example, HIV is a relatively new species of virus.
 

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