i seen like 6 people calling them that and seen a few labeld as t cups they must be all makeing the name up

oh look even this i found online
Common name
- Reticulated Stingray, Teacup Stingray
Scientific Name- Potamotrygon Reticulata
Native geographical area- Amazon Basin, South America
Native habitat- murky streams and rivers with sandy or muddy bottoms and submerged vegetation.
Maximum Size- 12-14 inches in disk diameter (this does not include the length of the tail!)
Minimum Aquarium Size-125 gallons, 72x18x24
Diet- most meaty foods such as black worms (my rays favorite), bloodworms, earth worms, krill, beef heart, even live feeders or any fish small enough to fit in its mouth.
Tank zone- bottom dwellers
Temperament & compatibility- teacup stingrays tend to be very peaceful and will usually ignore other fish in the aquarium (aside from eating very small fish). Males, however, can become aggressive towards other rays and when it is spawning time, the male will bite the females disk as a part of courtship.
Hardness range-soft water (less than 10 DH)
pH range- around 6-7 is usually optimal
Temperature range- 78-82 degrees F
Notable sensitivities- burns: stingrays are very sensitive and even a slight touch of a heater can cause a burn. make sure to buy a heater cover or place the heater elsewhere such as a sump if that is being used.
Hardiness- teacup stingrays are fairly hardy for freshwater stingrays, but are not for beginning hobbyists.
Physical description-the teacup stingray is an olive color with dark markings that sort of resemble a net. They have a white underbody. Theyre tail is about 1/2-3/4 of the length of theyre body.
Spawning notes-