I made some models of possible parts for macroscopic stage, based on the recent Dev forum post by Deus:

First line: extendable proboscis for swallowing smaller creatures, a stabbing proboscis, a mouth proboscis (with eversible pharynx), 2 tail fins, and 2 side fins.
Second line: villi for increasing surface area, a radiator frill(?) for the same purpose, 2 different filter feeding extensions, a seta ‘leg’, a stinger, and a clump of seta ‘fur’.
Third line: spatial / motion-detecting setae, mesoglea, 2 types of jaws, a set of mandibles, and 2 types of digestive system.
And finally: open and closed circulatory systems,
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