Personal communication with Prof Ip

Important take home message from a brief exchange (I went to borrow a book from Prof Ip):

1. The secondary fused lamellae of the gills of Periophthalmodon schlosseri is a telling difference should I find it difficult to tell it apart from another species.
(Problem is, I have not been able to even lay my hands on one!)

2. When a mudskipper "disappears" into a burrow, it is not necessary its own.