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I've seen a couple of these around so never thought to check I.D. going back through photos and can't see any similar on here. Help would be appreciated :)

Scuba diving with @ shaun-lee

zipping along the surface of the water at high speed. These ones beached on a rock when the wave surge receeded

Very long (30cm+) polychaete worm drifting/dancing in the outgoing tide, saw a couple

A couple of times I've seen these big swarms at this spot near shore.
All the different colour variations swimming around probably a 3m^2 area.

I have no idea what these are. Weird, active tunes coming from ascidian like pink mass. Small (maybe 3mm) and growing from the stick I found the feather aeolids on

One I haven't seem before. It was very fast.
Under a rock.

~0.6cm long
~1m subtidal

This fellow is tiny, maybe 1mm diameter, only spotted through the viewfinder while photographing nearby 5mm sea anemones.

It slowly opened the arms but not very wide.

Quite common.

~0.5-1cm diameter

Outer Waitemata Harbour seashore at Hobson Point, Orakei, Auckland 1071. One live animal on the underside of a submerged rock, in the low intertidal.

Tim burton worm.

Manukau Harbour seashore at Blockhouse Bay, Auckland. In an upper intertidal rockpool.

Tiny one with an interesting head.
Under a rock.

~1m subtidal
~0.6cm long

Same species as previously observed: 103465983.
Under a rock.

~2cm long
Shallow subtidal.

Large beds growing on the shelves, much smaller than the parchment tubes washed up on beaches. Most of these photos at c6m (high tide). The clump was weird.

was about 1m long

Approx 30mm length, found amongst seagrass roots at low water.

The other species to the previous ones I have observed?

Under a rock.
~1m subtidal

I was told these are the polyps of a moon jellyfish

Used peristaltic motion to aid movement. Under a rock.

~1.5cm long

Under a rock

~3cm long
Upper Intertidal

head end found in coral rock (most of tail missing); swarming rear ends in tray (red = female; green = male)

Many individuals S
wimming down a drain from Cairns swamp towards the river

~3cm wide
~2m depth

Big guess - is there a guide for sedentary marine worms?

Under a rock tucked up.

~1.5 cm long
<1m depth

~3cm long

Outer Waitemata Harbour seashore at Hobson Point, Orakei, Auckland 1071. Intertidal on rocky reef.

~1cm

Appeared to come out of a shell tube.

Seen under the mangonui fishing wharf during marine biosecurity surveillance

more weird life!

I thought it was an eel but looking at the photos the Variable Oystercatcher caught and ate some kind of large marine worm?