Strangest Invertebrate Ever

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A Nemertean Worm – 1 of 13 terrestrial species recorded worldwide – four are known to exist in Australia (Argonemertes: australiensis; dendyi; hillii; stocki). The identification of this individual has not been confirmed and may be new to science or require a range extension.

All species found in Australia are from the Argonemertes genus. Jon
Norenburgj from the Smithsonian Institution suspects that this individual could belong to the species Argonemertes australienis known from south-eastern Australia and Tasmania but without DNA confirmation it is difficult to conclude.

Terrestrial nemerteans need damp, dark and cool habitats, under rotting logs, in leaf litter or, less often, under stones, in lands where the climate is equable and suitably damp. There are serious worries that some of the terrestrial species may be extinct, or at least have suffered significant declines in their abundance (Moore, Gibson, Jones 2001).

Nemertea (ribbon worms) are characterised by a long, eversible proboscis held in a hollow proboscis sheath (rhynchocoel) above the digestive tract. The Phylum also has distinct circulatory systems and a tubular gut with anus. The nemertean proboscis normally is used for prey capture but in most terrestrial and some intertidal species it also is used as a very effective escape mechanism. Marine species are known to feed by shooting out the very long thin proboscis which is either sticky or has poisonous hooks. The prey is entangled in the proboscis and drawn towards the worm's mouth.

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Protostomia
Superphylum: Lophotrochozoa
Phylum: Nemertea
Classis: Enopla
Ordo: Hoplonemertea
Subordo: Monostilifera
Familia: Tetrastemmatidae

Possible Genera: Algonemertes - Amphinemertes - Arenonemertes - Nemertellina - Prostoma - Prostomatella - Prostomiopsis - Sacconemertella - Sacconemertes - Sacconemertopsis – Tetrastemma

ibsut, Tiggrx, iamah, Sham Hardy, and 257 other people added this video to their favorites.

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  1. Butter Fields AKA nD! 54 months ago | reply

    Hi, I'm on the otherside of the planet - Europe - but is this anything like what you have? Found it in my garden.

    I've taken to calling it a Slug/Worm Thing- not very scientific I know but it fits!

  2. BassPeer [deleted] 54 months ago | reply

    That's really strange! Reminds me a bit on bad sci-fi movies from the 70's, but it's much cooler because it's real :D

  3. Just Frogging About 48 months ago | reply

    Daniel, how many views for this thread by now?

  4. Daniel O'Brien 48 months ago | reply

    428,523 - not going up as fast as it used to

  5. Kreativ Snail 46 months ago | reply

    This is a really intersting critter. I love your pix.

  6. Proleshi 42 months ago | reply

    Wow, that is very cool. Never seen this creature before.

  7. geedublya 36 months ago | reply

    Here is a video of the same type of worm. Found on the North Coast of NSW near Coffs Harbour.

    Thanks for the identification Daniel it answers our questions.

  8. Scott Eipper 34 months ago | reply


    I found a purple coloured one while searching for geckos at Comboyne. Looked similar to a leech but did the same thing


  9. Daniel O'Brien 34 months ago | reply

    Yeah i found another individual on the central coast which was black and definitely was a terrestrial nemertean worm too. If you happen to see one again i would chuck it in some ethanol and send it away to be analysed cause these ones havent been described yet.

  10. mingdood 34 months ago | reply

    oh my fuck~

  11. MEFITICO 32 months ago | reply

    What the hell! MITICO!

  12. Michael J. Barritt 31 months ago | reply

    Wow, how fascinating!

  13. luvtsandcd 27 months ago | reply

    That is just odd but pretty cool.

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