Professional ‘guilds’ of bacteria gave rise to the modern microbiome

Even the smallest marine invertebrates — some barely larger than single-celled protists — are home to distinct and diverse microbial communities, or microbiomes, according to biologists. The study underscores that a vast diversity of animals have microbiomes, just as humans do. But more surprisingly, there’s little correlation between how closely related most animals are and how similar their microbiomes are — something widely assumed to be true based on the study of humans, larger mammals, and insects.
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