Sexing Dojo loaches - Newb here! Help?

[WaterDragonies]

Okay, I know you sex them by the pectoral fin...but which fin is the pectoral one???? And I've read that the males have a triangle pectoral fin, and females have a round one...but this doesn't help me because I don't know which one is the pectoral fin. Can someone show me a picture of a dojo loach with which fins are which? I looked online to get some pictures of what a pectoral fin might be, but they don't help 'cause the loaches have more fins....

[mikev]

Lampanyctodes hectoris
(1) - operculum (gill cover), (2) - lateral line, (3) - dorsal fin, (4) - adipose fin, (5) - caudal peduncle, (6) - caudal fin, (7) - anal fin, (8 ) - photophores, (9) - pelvic fins (paired), (10) - pectoral fins (paired)

src
hth

[Graeme Robson]

These fins below or just past the gill-plate.