How does the genitals look different on plecos?

[Dr.UltraScarlet]

Hi !

I am wondering, it what shape are the genitals different on plecos, especially pseudacanthicus. All the normal features with looking on odontales growth and body shape are almost useless with these. I have been able to spot that the smal one is a little more round and have a long ( 3 mm) tube that I have deemed an ovipositur (eggtube). The two that fight alot and are relative big, plus slim(all L025 are slim) I think is males. Then the last one Im unassure of have looked at it when it where against the glass, and it tube where perhaps only 2 mm, but I guess it could still be a female, but perhaps. Its just semming girlish because the two other males perhaps are larger.

I would off course like to provide pictures of them all, from above + below, but I miss the cable for the digital camera I burrowed, plus I dont like to take them out of the tank.
Yeha I have read the ISCOSA article and the bad picture of the genitals there is´nt any use, plus its some small pecoltia or hypancistrus.

Kind regards