Marine Invertebrates

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Marine Invertebrates

Anemones, Jellyfish, Comb Jellies & allies (Cnidaria & Ctenophora)

Crabs, Prawns, Barnacles & allies (Crustacea)

Sea Shells, Sea Slugs, Octopuses & allies (Mollusca)

Sea Stars, Sea Urchins & allies (Echinodermata)

Other Marine Invertebrates

Featured sightings

Anthopleura sp. at Green Cape, NSW - 21 Jun 2025 by Hejor1

Catostylus mosaicus (Blue Blubber) at Ku-Ring-Gai Chase, NSW - 27 Apr 2022 by KMcCue

Astropecten sp. (genus) at Toogoom, QLD - 20 Aug 2024 by BlueBowerArt

Hypselodoris obscura (Hypselodoris obscura) at Narooma, NSW - 6 Apr 2018 by BillBarker

Asteroidea (class) at Hope Vale, QLD - 5 Jul 2024 by GlossyGal

Catostylus mosaicus (Blue Blubber) at Lake Illawarra, NSW - 17 Sep 2023 by lbradley

Mictyris longicarpus (Soldier Crab) at Narooma, NSW - 11 Jul 2022 by GlossyGal

Unverified Anemone, Coral, Sea Pen at Pardoo, WA - 27 Oct 2022 by AaronClausen

Latest sightings

Unverified Jellyfish or Hydroid at Bermagui, NSW - 5 Oct 2025 by DougT

Austrobalanus imperator (Royal Rock Barnacle) at Lilli Pilli, NSW - 16 Jun 2023 by Hejor1

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Discussion

Jennyncmg wrote:

6 Oct 2025

I saw many small ones like this at Bermagui Harbour about this time of year many years ago. I think it is Cyanea rosea but could not get the verification to work

Unverified Jellyfish or Hydroid

MichaelBedingfield wrote:

29 Sep 2025

Thanks Jenny, I have aded the species to the master list.

Austrobalanus imperator

Jennyncmg wrote:

26 Sep 2025

I agree with the ID but don't know how to confirm - the drop down does not show that choice.

Austrobalanus imperator

Jennyncmg wrote:

3 Sep 2025

Sorry I dont know what species and they are really difficult to ID

Unverified Sponge

Jennyncmg wrote:

3 Sep 2025

sorry I cant tell from the photo - nearest would be a umbrella/moon jelly (Aquorea eurhodina) but it's usually easy to see the 4 underside lobes.

Unverified Jellyfish or Hydroid

Significant sightings

Scylla serrata at Wonboyn, NSW

Species Richness Score (SRS)

996

Top contributors

Hejor1 385
MichaelMcMaster 156
Jennyncmg 124
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trevorpreston 96
pennybeaer 68
Seadragon 50
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