this genus was divided in a work done by William Cetzal and German Carnevalli.
A: is Cohniella
B: lophiarella (note large pbulb), they are from central america and Mexico.
C: lophiaris (americas)
D: Trichocentrum
the work separates it in a way that even without flowers you could put it in the right genus. you can either use the old method of calling all of them trichocentrum, or you can go and name your plants as suggested by Cetzal/Carnevalli
both ways are ok.
all trichos that looks like rat tails are cohniella.
all trichos that has a prominent pbulb are lophiarella,
all trichos that has ear mule, but a very small Pbulb are lophiaris.
all trichos that sports very few flowers (some large) or nectaries, keeps the name trichocentrum.
use the picture as reference.