Hadromerida (class Demospongiae, subclass Tetractinomorpha) An order of sponges in which the body has a radial structure. spicules and organic fibres form the skeleton. The cortex is simple. oviparous forms reproduce sexually. Some live in holes they have bored. They first appeared in the Cambrian.
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Haeckel, Ernst Heinrich Philipp August (1834 – 1919) German Naturalist, Scientist, Biologist, Philosopher, and Professor