Godzilla’s Taxonomy


Godzilla’s Taxonomy


Godzilla was found in “Godzilla vs King Ghidorah” to be a mutant of the dinosaur Godzillasaurus. However, the skeleton of Godzilla that appeared in “Godzilla x Mechagodzilla” is very different from that of dinosaurs, and the gap is beyond the range of mutation, and it is a very different form of creature.


A closer look at the story reveals that Godzillasaurus couldn’t afford to be fully verify it and was determined to be a very similar dinosaur.


So, if Godzillasaurus was a completely different organism from dinosaurs, what kind of organism was it really?


Godzilla’s skeleton is unique. The characteristics of mammals and reptiles are mixed in a mosaic pattern. However, in the biological classification, the hole opened behind the eye of the skull is called the infratemporal fenestra, which is an important feature related to the evolution of ecology such as chewing muscles and weight reduction, and is classified as follows according to the number.

[An infratemporal fenestra, also called the lateral temporal fenestra or simply temporal fenestra, is an opening in the skull behind the orbit in some animals. Source: Wikipedia]


Anapsids (mukyurui)
The most primitive group of reptiles (side reptiles)

[An anapsid is an amniote whose skull does not have openings near the temples.]

Infratemporal fenestra


Synapsids (tankyurui)
Group of mammals and their ancestors infratemporal fenestra


Diapsids (sokyurui)
A group of reptiles, including birds


Godzilla’s skull applies to synapsids. It’s hard to tell, but in the case of Godzilla, one infratemporal fenestra is connected to the hole in the eye, a shape found in many other synapsids.


In other words, Godzilla is not a reptile such as a dinosaur. Moreover, pre-mammalian synapsids also had reptile-like characteristics such as oviparity. Godzilla’s ancestors must have been born around that area.

[Oviparous animals are animals that lay eggs, with little or no other embryonic development within the mother. This is the reproductive method of most fish, amphibians, reptiles, all birds, the monotremes, and most insects, some molluscs and arachnids.]


Further inquiry, the therapsid is a highly mammalized species, consistent with the biological characteristics of Godzilla.


The hypothesis is that Godzilla’s ancestors are most likely separated from therapsids and are uniquely evolved organisms.

[Therapsida is a group of the most advanced synapsids, and include the ancestors of mammals. Many of the traits today seen as unique to mammals had their origin within early therapsids, including hair, lactation, and an erect posture.]

Source: Godzilla ゴジラ徹底研究:完全存版 (Magazine House Mook, p 127)