Pseudo-semaphore is a weird temperament in which the third harmonic does not have a single consistent mapping. If you want to force it into the regular mapping paradigm you have to think of it as a 2.3.3'.7 temperament.
It's called "pseudo-semaphore" because it has the same MOS structure as semaphore, but 49/48 is not tempered out. Perhaps it's better to think of it as superpyth in which the 4/3 generator has been split in half forming a weird interval that's neither 8/7 nor 7/6.
|9/8||9/7||3/2 (flat)||12/7||9/8~8/7||3/2 (sharp)||1/1||4/3 (flat)||7/4~16/9||7/6||4/3 (sharp)||14/9||16/9|
5-note (LLLLs, proper)
|Small ("minor") interval||224.||468.||712.||956.|
|JI intervals represented||9/8~8/7||3/2|
|Large ("major") interval||244.||488.||732.||976.|
|JI intervals represented||4/3||7/4~16/9|
9-note (LLsLsLsLs, improper)
Here's where all the action begins. Note that this nine-note scale contains nine 4/3s and nine 3/2s. The only way this is possible with a single mapping for 3 is an equal temperament, and all of these 4/3s and 3/2s are much more accurate than in 9edo.
|Small ("minor") interval||20.||244.||264.||488.||508.||732.||752.||976.|
|JI intervals represented||7/6||4/3 (flat)||4/3 (sharp)||14/9||7/4~16/9|
|Large ("major") interval||224.||448.||468.||692.||712.||936.||956.||1180.|
|JI intervals represented||9/8~8/7||9/7||3/2 (flat)||3/2 (sharp)||12/7|