The Daphnia genus is really old. That’s really interesting for studying infectious diseases.

Preface: This post is a bit different than a typical post for me (or any of us here at DE!) It relates to an interesting bit of Daphnia biology that I find myself relating a lot when I talk to people more generally about my research. People seem to find it surprising and interesting, so I decided to write a post on it in the hopes that others find it interesting, too.


If I put a bunch of different Daphnia on a microscope in front of you, you’d probably think they all look pretty much the same.* As an example, when keying out the species I’ve done the most work on, Daphnia dentifera**, using the excellent online Haney et al. key, these are two of the first traits you need to focus on:



Those aren’t exactly traits that are overwhelmingly obvious, are they?

I think it is because of their morphological similarity that it is then very surprising to most people when they learn just how old the genus Daphnia is. It’s really old.

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