Agreed, this is my thinking as well. One time I found tan/peach colored ignitus with bright red tails AND caudal peduncles. They looked like the tail and back part of the body was accidentally spray painted red...I'd love to know where those came from!
yah i totally know what you mean!
i think for anthiases and most other fish it's not as simple as "A and B".
these can be totally different species as far as we know and has led many scientist, the "splitters", to separate them into different species.
there are many reef fishes that have "seemingly identical" coloration, but then get differentiated into new species eventually.
one of the best example is the two new species of anthias, P. bimarginatus and P. unimarginatus. at first glance they look IDENTICAL to Pseudanthias parvirostris. and guess what? all these 3 share the same range as P. parvirostris.
we see the same in pseudochromis paccagnellae and Pseudochromis dinar.
i won't be surprised if the squamipinnis anthias one day get split up into many new species, but all in the same complex.
anyway don't want to dilute this thread away from the main topic.
but it's so interesting, these fishes!