Amphibians

Conclusion
There are several species of amphibious aliens.  They come from various star systems.   They have webbed fingers and toes.  They tend to be humanoid.  They are most likely to reproduce sexually but, some of them may be asexual.  Some of them are hermaphrodites.  They most likely lay eggs.  They are very intelligent since they have space travel.  Not much is known about them.  It has been written that dolphins are the offspring of an African woman and a merman, possibly a Nommo.  The Nommo are fish like and they have enlightened humanity. They come from Sirius B.  The Nommo may have looked something like mermaids and mermen.  Some of these amphibious aliens are positive, while others are negative.      

References
http://nationalufocenter.com/2015/02/filers-files-09-2015-amphibian-aliens/