Dinotopterus: From the Greek, di-, meaning two, noton, meaning back and pteron, meaning fin; in reference to the presence of the two dorsal fins (rayed and adipose).
Sexing
In ventral view especially, females are much broader in the body than males of equal age and rearing practices.
Size
Smallest 1000mm, largest 1750mm, average 1375mm, most commonly 1000mm. All SL.