Dear Twitpic Community - thank you for all the wonderful photos you have taken over the years. We have now placed Twitpic in an archived state.. Pseudoryzomys is a rodent from south-central South America in the family Cricetidae. Found in lowland palm savanna and thorn scrub habitats, it is a medium-sized rat, weighing about 50 grams (1.8 oz).. is and in to a was not you i of it the be he his but for are this that by on at they with which she or from had we will have an what been one if would who has her.