I just took it as he was collecting all kinds and discovered some new ones. The medusa spider would have to be an already known one with all the information he knew about it. IMO

His claims might also have been his geeky way of flirting with Nikki, cause there are billions of insects and for him to claim with any certainty that he found new ones without a data base to check against is kinda far fetched.
More than anything else it is just a scientist doing scientist things and a way for Nikki to learn about a spider she can use to manipulate poor Paulo

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Doctor playing golf. Woo, boy howdy, now I've heard everything. What's next, cop eating a donut?