Conversation so far:
Why was Vladimir Nabokov interested in entomology?
Vladimir Nabokov's interest in entomology had been inspired by books of Maria Sibylla Merian he had found in the attic of his family's country home in Vyra.
Did Vladimir Nabokov do anything important regarding entomology?
During the 1940s, as a research fellow in zoology, Vladimir Nabokov was responsible for organizing the butterfly collection of the Museum of Comparative Zoology at Harvard University.
What year did Vladimir Nabokov start to get into Entomology?
During the 1940s, as a research fellow in zoology, Vladimir Nabokov was responsible for organizing the butterfly collection of the Museum of Comparative Zoology at Harvard University.
Does Vladimir Nabokov have anything displayed today?
The Harvard Museum of Natural History, which contains the Museum of Comparative Zoology, still possesses Vladimir Nabokov's genitalia cabinet, where the author stored his collection of male blue butterfly genitalia.
Was Vladimir Nabokov's work critically successful?
Yes, his writings in this area were highly technical. Many of Vladimir Nabokov's fans have tried to ascribe literary value to his scientific papers, Gould notes.
Anything interesting that you can tell me about?
Though his work was not taken seriously during his life, research supports Nabokov's hypothesis that a group of butterfly species came to the New World over the Bering Strait.
Does anyone else agree with Vladimir Nabokov's stance on this?
Rather than assuming that either side of Vladimir Nabokov's work caused or stimulated the other, Gould proposes that both stemmed from Nabokov's love of detail, contemplation, and symmetry.

Question: What else did he use to distinguish species?
Self-contained rewrite: What else did Vladimir Nabokov use to distinguish species?