AFAIK, the common name for most of them is "hoplo cat". One of my Hoplosternum littorale can be seen just below my lima in this pic:Is there a common name to these cats? How big do they get? Could I find one in my lfs, or would I have to order it? What do they look like? Pics?
Better view (this one is the male, and there's a female Megalechis thoracata behind him):
A couple pics of a Callichthys calllichthys:
And this is Megalechis thoracata, a male specimen:
A pair of M. thoracata, male below:
About the sizes, Callichthys callichthys and Megalechis thoracata are said to be around 8 inches and Hoplosternum littorale is a lot bigger... I've personally seen a 16 inch long specimen.
Best regards.
Daniel.