Favoritos de edanko

Found below the wrack line. Very fragile. I'm guessing that it was formed beneath the surface and that gentle waves/currents washed the surrounding sand away.
Compare cocoons for Hypocharassus pruinosis: https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.jstor.org%2Fstable%2F2422259&psig=AOvVaw1tGtqquQgTRizY0HLKRxK4&ust=1611342253883000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCOD91oLcre4CFQAAAAAdAAAAABAD

Is it a fish? Is it a slug? Is it a fishy anemone? I do not have a clue what this is!

It is about 30mm long and there were a few of them in the sand - outgoing tide nearly on the turn. Most were buried and only the "fan fin" was showing.

Resting on the wet sand, when the sand collapsed it arched it's face upwards (2nd and third photos) and seem to spawn capsule from somewhere - there are 2 floating in the 4th pic.

Totally hypnotic, by the time my sister-in-law and I carried on the brother had walked 2kms away from us!

Seen while conducting a quick Bioblitz near Kensington Park Elementary School. I noticed this area had good tree canopy through Google maps so decided to come check it out. It also had a nice weedy area with plenty of insects.

Observations from today: https://www.inaturalist.org/observations?nelat=25.783239721297168&nelng=-80.23795067332685&on=2020-11-25&order_by=observed_on&place_id=any&swlat=25.780582988587906&swlng=-80.24815916083753&user_id=joemdo&verifiable=any

Same individual as a larva:
https://www.inaturalist.org/observations/66432110
https://www.inaturalist.org/observations/66756129
As a pupa:
https://www.inaturalist.org/observations/66803100
As an adult one day earlier (day of emergence):
https://www.inaturalist.org/observations/67560661

Now a free-flying aphideater.