Mikadocephlaus gracilirostris (Maisch and Matzke 1997) was described from “an almost complete skull (almost 50 cm long)” from the Anisian-Ladinian of Switzerland that “does not fit into any of the currently recognized families of Triassic ichthyosaurs.” Here it nests with the YGMIR SPC V0218 specimen wrongly assigned to Guanlingosaurus in a basal node between Grippia and Chaohusaurus.

not Guanlingsaurus liangae (Yin et al., 2000; Late Triassic, Carnian, up to 10m in length, YGMIR SPC V0318) is one of the largest ichthyosaurs known. Sander et al. 2011 lumped this specimen with Shastasaurus, but Ji et al. reinstated the original generic name.

This specimen has a very short snout and a very low, wide skull, but it is not related to the YGMIR SPC V0317 specimen of Guanlingsaurus. This is instead a very primitive toothless ichthyosaur.

Ji C, Jiang DY, Motani R, Hao W.C, Sun Z and Cai T 2013. A new juvenile specimen of Guanlingsaurus (Ichthyosauria, Shastasauridae) from the Upper Triassic of southwestern China. Journal of Vertebrate Paleontology 33 (2): 340.

Maisch M and Matzke AT 1997. Mikadocephalus gracilirostris n. gen., n. sp., a new ichthyosaur from the Grenzbitumenzone (Anisian-Ladinian) of Monte San Giorgio (Switzerland). Paläontologische Zeitschrift 71(3/4):267-289.

Yin et al. 2000. A preliminary study of the early Late Triassic marine reptiles from Guanling. Guzihou Province, China. Geology-Geochemistry28:1-25.

wiki/Mikadocephalus
wiki/Guanlingsaurus