Underwoodisaurus husbandi were described by Wells & Wellington (1984) in the “Australian Journal of Herpetology”. Their description does not reflect the current standards of taxonomy, but comparing U. milii and U. husbandi makes it quite easy to see that they are different and our own observations in Australia show, that they inhibit different habitats. Until someone does a solid taxonomic review of the genus, we feel that they should be seen as two separate forms and support the differentiation of U. husbandi from U. milii. And we are not alone- many publications (including the well-known books of Dr. Danny Brown) also accept this species.
What a mind blowing success for Gavin Mellin in Australia. Granite Belt Thickies are super rare and I've never seen any hatching in captivity. Great story being told by the photos, thanks for documenting the timeline from the egg to the hatchling. So jealous of you mate. Keep it going, you are legend! :-)