Hermit crab (Dardanus arrosor) on the wreck of the P29 patrol boat

Invertebrates of Malta

We found the marine life of Malta strikingly different to what we are used to at home. I like to think that we are pretty good at finding things, because diving in Cape Town sometimes requires a beady eye, patience, and willingness to stare at what seems like barren sand. To both me and Tony the marine life of Malta seemed far less prolific than we are accustomed to in South Africa, and certainly there are not many invertebrates – in terms of both number of species and biomass –  at all. The warm, clean water, which is devoid of plankton, probably does not support the dense aggregations of life that we are used to in the Cape.

Here is a summary of pretty much all the different invertebrates we did see. (You should note that I didn’t have twenty pictures of each creature to choose from… In the ten dives, I saw one hermit crab, one sea squirt, and ONE sea cucumber. Not one sea anemone – though apparently they are there somewhere. Imagine that!)

Nudibranchs

A nudibranch (Flabellina affinis) that we saw often on the deeper wrecks
A nudibranch (Flabellina affinis) that we saw often on the deeper wrecks

Worms

We saw lots of fireworms, which have erectile bristles that will break off in your skin if you touch them, and cause irritation because they contain a toxic substance. They move just like centipedes, and occasionally form feeding aggregations – I didn’t get a photo of one, but Tony has some on video.

Fire worm (Hermodice carunculata)
Fire worm (Hermodice carunculata)

We also saw a lot of tube worms, some even inside the cave and tunnels we swam through. On the deeper wrecks and less disturbed sites we found very large specimens.

Tubeworms (Serpula vermicularis) inside a cave under Gozo's Blue Hole
Tubeworms (Serpula vermicularis) inside a cave under Gozo's Blue Hole
The tube worm Serpula vermicularis
The tube worm Serpula vermicularis
The tube worm Serpula vermicularis
The tube worm Serpula vermicularis
The tube worm Serpula vermicularis retracting into its tube
The tube worm Serpula vermicularis retracting into its tube
White tufted worm (Protula tubularia)
White tufted worm (Protula tubularia)

Crabs

Spinous spider crab (Maja squinado) hiding from the camera
Spinous spider crab (Maja squinado) hiding from the camera
Hermit crab (Dardanus arrosor) on the wreck of the P29 patrol boat
Hermit crab (Dardanus arrosor) on the wreck of the P29 patrol boat

Urchins

We saw a few different kinds of sea urchin, but I don’t have scientific names for them…

Urchin found in shallow water
Urchin found in shallow water
Sea urchins are light sensitive, so use shells and bits of seaweed as hats
Sea urchins are light sensitive, so use shells and bits of seaweed as hats
Dense purple spines cover this urchin
Dense purple spines cover this urchin

Sea cucumbers

A sea cucumber inside the cave leading to the inland sea at L'Ahrax Point
A sea cucumber inside the cave leading to the inland sea at L'Ahrax Point

Sea stars

Common starfish (Echinaster sepositus)
Common starfish (Echinaster sepositus)

We can’t move an inch in Cape waters without landing on a sea star, whereas in Malta I think I saw five starfish (individual specimens, not kinds) in ten dives. I was thus disproportionately excited when I did find them!

Irregular starfish (Coscinasteria tenuispina)
Irregular starfish (Coscinasteria tenuispina)

This next one is interesting – we find huge numbers of spiny sea stars at home, and I seem to recall reading that they are in fact a European “import”.

Spiny sea star (Marthasterias glacialis)
Spiny sea star (Marthasterias glacialis)

Ascidians

A red sea squirt
A red sea squirt

I say “ascidians”, but this is the only one I saw.

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Clare

Lapsed mathematician, creator of order, formulator of hypotheses. Lover of the ocean, being outdoors, the bush, reading, photography, travelling (especially in Africa) and road trips.