Interesting that they selected an illustration of Ameiurus melas for the cover.

Indeed, considering how prominent the organs are, I'm surprised there aren't more photos on the web.
There is a good one for Megalechis: https://www.scotcat.com/callichthyidae/ ... acata8.htm

"Gonopodium" in fishes more narrowly refers to a modification of the male anal fin used to inseminate females.
In this case, both the male and female structures would just be called genital papillae. In the females, I don't think it has any known function as the eggs are expelled from the urogenital ...

And...the original authors' response to this comment:
P. Brito, D. Dutheil, P. Keith, G. Carnevale, F. Meunier, B. Khalloufi, P. Gueriau, A reply to a comment on, A Saharan fossil and the dawn of the Neotropical armoured catfishes in Gondwana by Britz, Pinion, Kubicek and Conway
DOI: https://doi ...

Appears to be an albino Chrysichthys ornatus.

I have not heard of this species ever spawning in captivity. It seems that these days it is a pretty rare import.

I haven't come across anything about "a fish that can eat the bait without touching the hook" but there is apparently some debate as to which fish was originally referred to as "glanis" by the ancient greeks, with some arguing that it referred to shad (Alosa). Hard to imagine Silurus eating a bait ...