is there anything special about their skull?
The snout was elongated and extremely slender – in front of the bony nostrils.
Acamptonectes
The snout was elongated and extremely slender – in front of the bony nostrils, it was only 45 mm wide in the holotype specimen. 
what is acamptonectes? It is an extinct genus of ophthalmosaurid ichthyosaur. what did they eat? Fish and squid. where were their fossils discovered? England and Germany. to which period did these fossils date back to? Early Cretaceous period. what was the geology like during that period? Large igneous provinces. which ores are deposited in it? UNANSWERABLE is any meteorite believed to have struck there? No. who discovered the remnants of the animals mentioned at the beginning? Four students and a technician from the geology department. how are they classified? A member of the family Ophthalmosauridae.
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Acamptonectes [SEP] Skull
The basal two thirds of the crown had subtle, longitudinal ridges, and was covered in a coarse texture, finer than in "Aegirosaurus" and some "Platypterygius" secimens. The base of the crown was slightly bulbous and almost smooth, unlike in other ophthalmosaurids.