[1] Fossil remains from Svalbard from the specimen SVT 203 were originally assigned to G. longirostris but are now thought to have belonged to a non-ichthyopterygian diapsid related to Helveticosaurus.

[2][3] Fossils have been found along the coasts of Greenland, China, Japan, Norway, and Canada (Sulfur Mountain Formation); of Early Triassic age.

Descriptions created by Wiman in 1933 originally depicted G. longirostris as having very primitive forelimbs that were not yet completely specialized for aquatic life.

[7] This study revealed: Ichthyopterygia are fully aquatic reptiles that evolved from terrestrial tetrapods, with no transitional lineage being discovered so far.

[9] Parvinatator wapitiensis Utatsusaurus hataii Xinminosaurus catactes Grippia longirostris Gulosaurus helmi Chaohusaurus geishanensis Cymbospondylus Mixosaurus cornalianus Phalarodon atavus Qianichthyosaurus zhoui Toretocnemus californicus Shonisaurus popularis Shastasaurus pacificus Callawayia neoscapularis Guizhouichthyosaurus tangae Besanosaurus leptorhynchus Californosaurus perrini Parvipelvia G. longirostris were well adapted to an aquatic lifestyle during early – mid Triassic.

[8] This evidence is contradictory when cross examined against previous work done in the thirties and eighties, which theorized that G. Longirostris practiced a diet specialized in mollusca and small fish.

[2] All of these results were based on samples that did not include an existing snout, therefore they were highly speculative and paleontologists will not know what these animals ate until a full skull is found.