huh. That sounds like a way of just avoiding admitting they are mixing different subspecies together (if the original identification of the guentheri was correct and I don't see why it wouldn't have been if they knew where they came from).
It seems they did separate stock and or in the interval some of these individuals may have died or moved to other collections. Admixing may have occurred ...
Hix, we are talking full species now in Chelonoidis sp. (the more ancient and now correct scientific nomenclature). So, we have f.i. C. vicina, C. guentheri, C. hoodensis and C. porteri.
C. elephantopus is used for the species from Floreana. And to the best of my knowledge no representatives of this species nor C. hoodensis now remain abroad - that is ... outside the Galapagos islands -.
NOTA BENE: C. elephantopus has recently been demonstrated to persist in hybrid tortoises at both the Santa Cruz breeding center and on Northern Isabela (Albemarle .. in the Anglo Saxon vernacular, but I prefer to use the Spanish names as Ecuador is Latino speaking for easy reference) and an estimated 40 of this species are thought to remain on northern Cerro Wolf, Isabela.
NOTA BENE II: In more or less the same localities on Cerro Wolf, Isabela hybrids of C. abingdonii persist where the parentage must have been C. abongdonii tortoises having lived and bred on Isabela.
Both examples are due in no undue part to out-shipping by sailors poaching giant tortoises for the long journeys to US, Asian and European ports.
On the whole, my understanding of Galapagos tortoise imports outside of the Galapagos islands is that most were taken from northern / middle Isabela and / or Santa Cruz islands and thus belong to either C. becki, C. guentheri, C. vicina and C. microphyes and for the Santa Cruzs just C. porteri. The highest takings have been from Santa Cruz and the porteri group, followed to a lesser extent by both C. vicina and C. guentheri.
Only very few specimens / individuals were collected from any other Galapagos giant tortoise species. One notable exception was a C. eppiphium that ended up in Zoo Koeln and from there was transferred with another male (I think this was the C. porteri species) to Zoologicka Zahrada Praha.
This - for our US attendance whose collecting expeditions have been the most thorough both in live and killed giant tortoises - includes all the collections from the 1928 Townsend Expedition!!!