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The original description of Simp. boitonei by Carvalho in 1959, and the
basis of the original creation of Simpsonichthys as a genus, was based on
this species lack of ventral or pelvic fins. I was under the impression that
LaCorte found a population of "boitonei" in 1978 or 1979 on a collecting trip
that had ventral fins and this called it all into question. I do not know if
the LaCorte population became part of the basis of S. zonatus' description,
but S. zonatus has the ventral/pelvic fins -- at least mine did and the
boitonei I had in the 70's from Allen Semitt's original distribution did not.
Anyway, as adults, bokermanni and boitonei should be easy to
separate. You might be able to do it when they are small if you really
closely study the body and fin shape.
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