Consistency... not!
It annoys me how the Spectralids throughout the series have different family names. I suppose it's fair for the ES to be in a different family considering that it's practically constructed of electricity, but the Unmarked Spectralids and the other types in 3 and 4 shouldn't be in different families. They basically do the same exact things and just look a little different because one's in SD and the others are in HD!