I have heard of the loops one. They catch soil nematodes. I haven’t heard of the harpoons.
There are also sticky fungi (macroscopic this time) which catch falling twigs before they hit the ground and so get sole use rather than having to compete with all the soil-dwelling decomposers.
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Seems there are various harpoon types depending on the species. And apparently there are also some that use a sticky web to catch nematodes, some use small growths that apparently smell and taste good to the nematodes, but once they eat them, they grow through the intestine wall and spread all over. Also tasty poison drops seem to be used.
Many of these seem to be oomycetes, though, like the Haptoglossa-genus.
Not as much body plan diversity, but having read about the tiny sea grass squid last week and comparing them to the giant squid, I wonder how they compare with size range.
I think I read that the mass range in cephalopods is the greatest of all invertebrates. From the smallest hatchling to the heaviest adult is over 3 billion-fold. Nine orders of magnitude!
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