All the precambrian animals were weird ;P
Yes, although the fossil record for the precambrian period is scarce. See related link.
Jellyfish intervirbrates
The animals in the Precambrian Period were soft bodied animals. This Era was dominated by single celled organisms: algae, bacteria. Also in existence were jellyfish, spiders, crabs, and worms.
jellyfish-like animals, sea pen, and bacteria.
The appearance of complex, multicellular animals.
As far as we know for the majority of the Precambrian super-eon the only life on earth was bacteria.At the very end of the Precambrian multicelled life evolved. Amonst them jellyfish, invertibrates, sponges and pretty much a prehistoric version of most sealife today. There is also very suggestive evidence for simple plant life in the form of green algae in the Precambrian.
Late in Precambrian time
Examples of Precambrian animals are Brachiopods (aka lamp shells), Anthropods like spiders and crabs, jellyfish, sponges, and squids. There were also flora and fauna, of which 70% of their population was wiped out (Precambrian Mass Extinction). Most of the animals in that era were marine, soft-bodied organisms.
single-celled organisms and soft, boneless animals
Bri What - 2011 Weird Animals was released on: USA: 1 December 2011
It's not clear how any one animal could be "more" extinct than any other. However, those extinct longest are presumably unnamed Precambrian creatures who left no fossils.
YouTube offers literally thousands of videos featuring weird, funny or exotic animals. Other places to find videos of weird animals are the website for the Discovery Channel, Budget Travel and Daddu.