The species in question are Saccishou (Pronounced Suck-ee-sho-ooh), a creation of my own.
They are an aquatic mammal with reptilian-type features.
The top two are central, which is basically anywhere but the polar ice caps.
The bottom two are polar, pretty self explanatory.

(My website for them can be found here: http://kitetdromza.wix.com/saccishou )

The payment is in USD and each purchase comes with a stylized icon of your new character! (For an extra $15 I will make a semi-detailed ref sheet of your character, complete with their chosen name and any traits you want added.)

The designs are set, BUT, additional fins and alternate tail ends can be added. (For example, a mouth-tail or an oar-like tail)