†Ichthyosaurus trigonodon Theodori 1843 (ichthyosaur)
Belongs to Ichthyosaurus according to Theodori 1843
Sister taxa: Ichthyosaurus acutirostris, Ichthyosaurus breviceps, Ichthyosaurus carinatus, Ichthyosaurus communis, Ichthyosaurus conybeari, Ichthyosaurus entheciodon, Ichthyosaurus enthekiodon, Ichthyosaurus hercnyicus, Ichthyosaurus indicus, Ichthyosaurus intermedius, Ichthyosaurus latimanus, Ichthyosaurus platyodon, Ichthyosaurus polyptychodon, Ichthyosaurus rheticus, Ichthyosaurus tenuirostris, Protoichthyosaurus prostaxalis, Protoichthyosaurus prosostealis
Ecology: nektonic carnivore