"Take a look at this identity line-up of Cambrian lobopods, sir. Do you recognise...""Him! That one on the right! That's the one I saw evolving into an Anomalocarid!"
Over to the right of the line-up, note the speculative evolutionary trails from the Xenusiid lobopods to tardigrades, and to Pentastomid parasites like Bockelericambria -- which really deserve a Riddled post to themselves for being so ghastly as to belong in Charlie Stross' next 'Laundry' novel.
Kerygmachela kierkegaardi and Pambdelurion whittingtoni, other lobopods elsewhere in the Cambrian oceans had finished evolving into
One Anomalocarid survived another 100 million years into the Devonian era by growing flippers and pretending to be a penguin. The official line, otherwise, is that they are long-extinct so we will never what they taste like with caper butter; and any resemblance between their circular mouthparts and those of Fane Flaws cartoon characters c. 1987 is purely coincidental.
The official line is also that lobopods are entirely of terrestrial origin, and that velvet worms such as Peripatus are the only surviving relatives.
Siberion lenaicus is especially scary. No further speciments are likely to turn up because after Dzik's initial report, that particular limestone outcrop in Siberia was destroyed. This was by private fossil collectors and was totally not a cover-up to forestall the piecing together of dissociated knowledge that would open up terrifying vistas of reality.