South Australian Marine Life
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samarineguide.com.au
South Australian Marine Life
@samarineguide.com.au
This account highlights the coastal marine life found in South Australia, as featured in my pictorial guide at https://www.samarineguide.com.au. It is maintained by Matt Tank (@mtank.com.au).
SA Creature Spotlight - Actaea peronii (Thorn-legged Crab)

This small reddish crab, found under rocks, is most recognisable for the dense blunt spines on its walking legs and tubercles on its claws.

www.samarineguide.com.au/taxon/10/

#greatsouthernreef #underwaterphotography #southaustralia #crab
December 28, 2025 at 7:09 AM
SA Creature Spotlight - Desis kenyonae

One of the only true intertidal spiders, this species seals itself in rock crevices with its web at high tide, emerging to hunt on the rocks at low tide.

www.samarineguide.com.au/taxon/588/

#greatsouthernreef #spider #southaustralia #underwaterphotography
December 12, 2025 at 5:57 AM
SA Creature Spotlight - Parvulastra exigua

This small 5-armed grey-green sea star is usually found in large numbers in rockpools, both exposed and on the underside of rocks.

www.samarineguide.com.au/taxon/770/

#greatsouthernreef #seastar #southaustralia #underwaterphotography
December 7, 2025 at 4:27 AM
SA Creature Spotlight - Holopneustes Sp.

This undescribed sea urchin is reddish, with short, blunt spines and brown tube feet. It is usually found attached to large-leafed algae.

www.samarineguide.com.au/taxon/271/

#greatsouthernreef #urchin #southaustralia #underwaterphotography
November 27, 2025 at 1:34 AM
SA Creature Spotlight - Rhodosoma turcicum

This small solitary ascidian is distictive for the flap of test that it can use to protect its siphons, which are arranged perpendicular to its body.

www.samarineguide.com.au/taxon/640/

#greatsouthernreef #ascidian #southaustralia #underwaterphotography
October 16, 2025 at 5:50 AM
SA Creature Spotlight - Ammothella biunguiculata

This long-limbed sea spider has a long spherical proboscis and equally long chelifores. It is plain brownish in color, with a short abdomen.

www.samarineguide.com.au/taxon/908/

#greatsouthernreef #seaspider #southaustralia #underwaterphotography
October 4, 2025 at 9:27 AM
SA Creature Spotlight - Paliolla cooki

This nudibranch is small and squarish, and feeds on the bryozoan Beania magallanica. It is usually a pale pink to orange, with darker orange spots.

www.samarineguide.com.au/taxon/589/

#greatsouthernreef #nudibranch #southaustralia #underwaterphotography
September 13, 2025 at 2:51 PM
SA Creature Spotlight - Aptychotrema vincentiana (Western Shovelnose Ray)

A brownish ray, with darker brown blotches, particularly around the eyes, this ray can be recognised by its long pointed snout.

www.samarineguide.com.au/taxon/49/

#greatsouthernreef #underwaterphotography #southaustralia
August 15, 2025 at 3:18 AM
SA Creature Spotlight - Myliobatis tenuicaudatus (Southern Eagle Ray)

This species of eagle ray has a pattern of greyish-blue blotches that are often quite subtle, and a long and thin, but rigid tail.

www.samarineguide.com.au/taxon/340/

#greatsouthernreef #underwaterphotography #southaustralia
August 15, 2025 at 3:15 AM
SA Creature Spotlight - Callistochiton antiquus

This orange/brown chiton has a furry, lightly-banded girdle. Its valves are heavily ribbed laterally, with fine cross-hatched striations centrally.

www.samarineguide.com.au/taxon/111/

#greatsouthernreef #chiton #southaustralia #underwaterphotography
July 29, 2025 at 7:07 AM
SA Creature Spotlight - Goniistius gibbosus (Magpie Morwong)

Not previously known from SA, this Western Australian species was recorded several times at Port Noarlunga Jetty between 2023 and 2024.

www.samarineguide.com.au/taxon/920/

#greatsouthernreef #fish #southaustralia #underwaterphotography
July 17, 2025 at 5:03 AM
SA Creature Spotlight - Styliferina translucida

This tiny snail grows to around 5mm. It has a transparent shell with brownish spots in between fine lines, and a large white stripe on its back.

www.samarineguide.com.au/taxon/797/

#greatsouthernreef #seasnail #southaustralia #underwaterphotography
July 10, 2025 at 5:16 AM
SA Creature Spotlight - Lipotrapeza vestiens

A small but thick pink to reddish-brown sea cucumber, this species has relatively large light-coloured tube feet. It is usually covered in debris

www.samarineguide.com.au/taxon/626/

#greatsouthernreef #seacucumber #southaustralia #underwaterphotography
June 27, 2025 at 8:25 AM
SA Creature Spotlight - Clavelina lepadiformis

This colonial ascidian is native to Europe, and likely introduced into Australia by shipping. It is mostly transparent, with bright white rings.

www.samarineguide.com.au/taxon/876/

#greatsouthernreef #ascidian #southaustralia #underwaterphotography
June 6, 2025 at 3:20 AM
SA Creature Spotlight - Electroma papilionacea

This small bivalve has a thin fragile shell and a skewed fan shape. It can be found on seagrass, kelp, and jetty pylons, often in large numbers.

www.samarineguide.com.au/taxon/219/

#greatsouthernreef #bivalve #southaustralia #underwaterphotography
May 25, 2025 at 4:59 PM
SA Creature Spotlight - Halocynthia dumosa

This solitary ascidian is distinctive for its bright orange test, with spines on the end of its dark-striped siphons. Its body is covered in papillae.

www.samarineguide.com.au/taxon/255/

#greatsouthernreef #ascidian #southaustralia #underwaterphotography
May 22, 2025 at 2:16 AM
SA Creature Spotlight - Coryphellina poenicia

This slug has a white or purple body with orange/red cerata. It has two large purple patches which look like eyes, but are actually jaw plates.

www.samarineguide.com.au/taxon/176/

#greatsouthernreef #nudibranch #southaustralia #underwaterphotography
May 12, 2025 at 12:59 AM
SA Creature Spotlight - Alpheus novaezelandiae

This pistol shrimp is variable in colour, but almost always with pale spots on the carapace and a dark mid-dorsal line.

www.samarineguide.com.au/taxon/808/

#greatsouthernreef #shrimp #crustacean #southaustralia #underwaterphotography
May 6, 2025 at 1:57 AM
SA Creature Spotlight - Cryptopolyzoon wilsoni

This well-camouflaged bryozoan (lace animal) colony appears as sandy "beaded" threads. Its feeding tentacles are only visible in extreme close-up

www.samarineguide.com.au/taxon/187/

#greatsouthernreef #bryozoan #southaustralia #underwaterphotography
April 25, 2025 at 5:37 PM
SA Creature Spotlight - Clarkcoma canaliculata

This brittle star has five whip-like arms with long paddle-shaped spines, and is usually a brown to black colour. It is fast-moving when disturbed.

www.samarineguide.com.au/taxon/158/

#greatsouthernreef #seastar #southaustralia #underwaterphotography
April 22, 2025 at 6:53 AM
SA Creature Spotlight - Anthothoe albocincta

This sea anemone has white tentacles with an orange oral disc. The column is also white, with greenish stripes. It can be found in large aggregations.

www.samarineguide.com.au/taxon/39/

#greatsouthernreef #anemone #southaustralia #underwaterphotography
April 15, 2025 at 3:56 AM
SA Creature Spotlight - Ischnochiton contractus

This chiton is variable in colour, with triangular streaks on either side of the dorsal ridge and rounded nodules on the outside of the valves.

www.samarineguide.com.au/taxon/286/

#greatsouthernreef #chiton #southaustralia #underwaterphotography
April 6, 2025 at 12:32 PM
SA Creature Spotlight - Elysia coodgeensis

This small sacoglossan (sap-sucking) slug eats green algae. It is greenish, with white blotches and black margins, with purplish to black antennae.

www.samarineguide.com.au/taxon/220/

#greatsouthernreef #nudibranch #southaustralia #underwaterphotography
March 22, 2025 at 4:40 PM
The coasts of South Australia host an incredible diversity of life and its rugged beauty rivals that of the tropics. Featuring almost 700 species, this guide can help you find & recognise these remarkable organisms.

www.samarineguide.com.au

#underwaterphotography #greatsouthernreef #southaustralia
March 18, 2025 at 3:21 AM
SA Creature Spotlight - Octopus kaurna (Southern Sand Octopus)

This octopus creates a den to bury itself during the day, only emerging after dark. This octopus cannot change colour and is an orange-red.

www.samarineguide.com.au/taxon/693/

#greatsouthernreef #southaustralia #underwaterphotography
March 17, 2025 at 5:22 PM