The black areas in these NASA radar images (taken Friday) are believed to mark Saturn’s moon Titan as the only place besides Earth in the solar system to have lakes. Even if they are hydrocarbon lakes of liquid methane or ethane.
"The Cassini spacecraft, using its radar system, has discovered very strong evidence for hydrocarbon lakes on Titan. Dark patches, which resemble terrestrial lakes, seem to be sprinkled all over the high latitudes surrounding Titan’s north pole."
THE TEXAS SCRIBBLER 
There’s a related news item at Methane makers yield to science which says:
The genetic code of an important group of methane-producing microbes has been sequenced by German scientists.
The archaea are probably the major source of methane emanating from rice fields, contributing up to a quarter of global emissions of the gas.
The article goes on to say that an archaea group called Rice Cluster I (RC-I) is probably responsible and then ends:
Some researchers hold out hope that some of the methane traces observed on Mars, for example, may be coming from organisms like RC-I.
John Latter / Jorolat
Evolution Research
Thanks for that, John. It’s interesting. Perhaps they will find such microbes on Titan, since there’s apparently a lot more methane there than on Mars.
You’re welcome Dick – stuff like this is so interesting I wouldn’t mind living forever just to see how it pans out! 🙂
Well, if there are lakes of methane on Titan – and no oxygen (cos it kills the little blighters) – then maybe they will be found there.
I’m a bit busy at the moment else I’ld check up to see what plans there are for future Titan probes – I’ll have to come back to it!
John Latter / Jorolat