T. rinconensis? It reminds me of a Neoporteria.

That is really nice looking. I just love the black spines.

Dawn

Very very beautiful. Most likely - Thelo rinconensis v. nidulans

Enjoy,
Noom

Thelo nidulans or lophothele! both are now included in Thelo rinconensis as synonyms. I agree

James, it is a real beauty, I have both forms...

These plants are seed grown, sown in 1979, so are getting along in years.

Thelo lophothele.
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{{gwi:489263}}{{gwi:489263}} Thelo nidulans.
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{{gwi:477648}}{{gwi:477648}} Cheers... CP.