Good parenting evolved multiple times in moss animals ScienceAdvances
But a new study on the 600-million-year history of these obscure animals highlights the important role good parenting has played in their enduring success. In one of the largest genetic analyses of invertebrate marine organisms to date, researchers sequenced DNA from hundreds of alcohol-preserved specimens stored in more than 20 museums around the world.
Cheilostomes are decidedly less obdurate. If other bryozoan colonies are villages, cheilostomes form diverse cities. They have the regular complement of feeding zooids that gather food, but these are merely one type among a variety of specialized structures. There are species with a built-in cleaning and locomotion system made of animals with a long protruding hair called vibracula that allow the colony to"walk" through coordinated movement.
Among their various specialties, many cheilostomes create brooding chambers to nurture their young, which previous studies indicate may have led to a steep uptick in their diversity.
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