I think I have a scientific discovery

enchilada

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Ok I’m not sure if this is a stupid or genius discovery, but I do find it interesting
that all tortoise species that has radiant/ star shaped geometric shell pattern are from areas surrounding Indian Ocean.
Genus : Psammobates
C5A25DE1-8934-4844-A4B8-34D6D63D2D68.jpeg 1C622E18-D6BF-43E7-9FAB-78BCA688A3AF.png
Genus :Geochelone
Indian/Sri Lanka/Burmese star tortoise
. C044F4CC-6DCD-4ECC-B573-5CE962DF5FD7.jpeg 99F3A05B-B97D-4F4D-A24F-E35FA8237EBC.jpeg



127C10C6-98BD-4FFA-AC66-9D178A35222B.jpeg 55E0ACCD-EC22-4198-867A-CAC3548DCEF4.jpeg

Radiata
2A0A4C92-C6AB-46AA-AC28-ECC9D15B954A.jpeg 0D9F45A0-6F50-4DB1-BEF8-BBEF85D9F87D.jpeg

pancake tortoise
0EF24B6C-1AE6-4BBF-B2B9-5D91AB3DC9E2.jpeg 8EB11EAC-CE97-4042-BDD2-AEEEF868435D.png
kinixys zombensis
DC05F9DE-02B5-493F-B0C3-0A98260E8F8F.jpeg 71FE48AC-4C83-48C7-8724-3862A1264898.jpeg
 

enchilada

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So I put together this map Myself
Yellow-- Psammobates
Blue--- kinixys zombensis
purple--Pancake
Red--Radiata
White--Indian Star
Pink---Sri Lanka Star
Greem--Burmese Star

9B607B5B-90A4-4AAF-BCF9-AB5027201D68.jpeg
 

enchilada

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Initially i thought this similarity must have something to do with the climate , but climate in Southern South Africa would be a lot different from Burma. And some areas in the Americas have similar climates but no tortoise there has geometric pattern ?

They are from 5 different genus, so probably not from a common ancestor?

well maybe their patterns are just coincidence and I'm drinking too much🍻🥂🍷🥃
 

pawsplus

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Pretty sure it's because they are all related back in the fossil record. When the one large land mass that used to exist split apart, some went to Africa and some stayed in SE Asia, and then evolved from there. :)
 

Relic

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I say do mouth-swabs of all the suspected tortoise species presented here, send the swabs off to Ancestry.com and let them do the DNA work for you. They will even generate a cute little map showing where the ancestors came from...
 

enchilada

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My theory is : their common ancestor appeared around 100 mya in east coast Africa when South America separated . Then they crossed the channel to India/Madagascar . After that India hits Asia then they spread to Southeast Asia .
 

zovick

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My theory is : their common ancestor appeared around 100 mya in east coast Africa when South America separated . Then they crossed the channel to India/Madagascar . After that India hits Asia then they spread to Southeast Asia .
It sounds quite plausible.
 

turtlesteve

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My theory is : their common ancestor appeared around 100 mya in east coast Africa when South America separated . Then they crossed the channel to India/Madagascar . After that India hits Asia then they spread to Southeast Asia .
This sounds nice but it’s contradictory to genetic studies. It seems as though this patterning has evolved separately for many different species.

19E14C4F-C2D7-48DB-9DF9-3117C0BC08B3.gif

It seems camouflage based, so I would hypothesize an adaptation to match specific (grassy?) habitats or to trick some particular types of predators.

Note also that Florida and ornate box turtles have the same patterning...
 

enchilada

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This sounds nice but it’s contradictory to genetic studies. It seems as though this patterning has evolved separately for many different species.

View attachment 307209

It seems camouflage based, so I would hypothesize an adaptation to match specific (grassy?) habitats or to trick some particular types of predators.

Note also that Florida and ornate box turtles have the same patterning...
Convergent evolution maybe ?
but Gopherus tortoise overlaps with Florida $ornate box turtle , yet they have no patterned shell . Or maybe gopherus are like sulcatas , they dig tunnels and stay inside, thus doesn’t need camouflage
 

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