Aug 16, 2023
New Zealand predatory land planarian, Arthurdendyus testaceus, Geoplanidae
Photo 1-2 by williambrockelsby, 3-4 by schneehagen, and 5-9 by amanhunt,
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New Zealand predatory land planarian, Arthurdendyus testaceus, Geoplanidae
Photo 1-2 by williambrockelsby, 3-4 by schneehagen, and 5-9 by amanhunt,
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#1849 - Tasmanoplana comitatis
A small terrestrial flatworm that we found in the bathroom at the holiday home we were staying out down in Yallingup a few years back.
According to Leigh Windsor, who IDed it for me, “In Australia, land planarians are occasionally found in bathrooms, especially in the tropics where I live. In older homes they may venture from the yard up the floor drain into the bathroom. In other cases the flatworms were probably accidently carried indoors on clothing - people working in the garden accidently brushing against a sticky planarian. Once in the bathroom, the planarians will seek out a dark damp location. When people find a planarian in the toilet bowl they get concerned that they have passed the flatworm. This will not be the case as planarians are generally repelled by fresh faeces, and there is experimental evidence to support this. Dogs especially may have a planarian adhering to their rear end as they contacted a planarian in the yard. Such cases when planarians are found on humans, native and domestic animals are termed pseudoparasitism. I have a few cases from Australia and overseas of this phenomenon.”
It’s a small planarian with a brown median stripe and darker broader paired lateral dorsal stripes between which is a pale yellowish ground colour heavily mottled with brown mottling the same colour as the median stripe. Ventral surface whiteish. Originally described from specimens obtained in the vicinity of the Mundaring Weir, much nearer Perth.
Terrestrial flatworms aka land planarians, Geoplanidae
Photographed by Art Anker // Facebook
Shared with permission; do not remove credit or re-post!
@youareagoldfishnow submitted: Spotted this slithering fellow the other day. It's looks like one of those earthworm eating worms? But I honestly have no idea. Northern Australia.
WHAT a cutie! It is a type of land planarian, just like the earthworm-eating Bipalium genus. This one isn’t a hammerhead flatworm though. Not sure on species. Maybe a blue garden flatworm? It does have sort of a bluish hue. If that’s the case they eat things like isopods, millipedes, and snails. Or possibly it’s Kontikia ventrolineata, in which case they apparently eat mostly snails and slugs. Thanks for sharing!
@abrica-bang submitted: Flatworm I saw in Groton, Connecticut. I didn't know there were terrestrial flatworms in this area???! I didn't even think before i just picked it up, I was too excited.. I hope they're safe to handle.
(One video limit this is (4/4)!)
Yes there sure are! Invasive, of course. This one looks like Bipalium adventitium. As far as I know they’re not dangerous to handle but it was discovered they have tetrodotoxin which is insanely toxic. I don’t think they have any way to use it on humans though. Just don’t eat one to be safe ;)
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#1156 - Caenoplana bicolor
Photo by Jo Crosbie in Melbourne, Victoria.
Caenoplana bicolor is a beautiful terrestrial planarian, with yellow and burgundy stripes. Geoplanids are mostly predatory, hunting down snails and other prey and using their mucus as glue and digestive juices, and their eversible proboscis to pierce arthropod prey, or to grasp soft-bodied prey such as earthworms.
Most Geoplanids have a very limited range, and are highly selective about the conditions they’ll live in. On the other hand, a few aren’t so fussy, and have spread widely. Caenoplana bicolor, for example, was originally native to SE Queensland but now found far outside that range. They were probably moved around with potted plants. Another Geoplanid, Platydemus manokwari, also known as the New Guinea flatworm, was introduced to certain Pacific islands to try and control the Giant African Land Snail, and promptly ate every native snail in sight. And spread to dozens of other islands, Puerto Rico, Florida, and France. AND it’s a vector of the potentially deadly Rat Tapeworm. Another Australian flatworm, Australoplana sanguinea alba, and New Zealand Flatworm Arthurdendyus triangulatus, are busy eating every British earthworm they can catch.