There were 6 accepted species found [distribution filter:
1 Astrophytum asterias (Zucc.) Lemaire distributionfilter: global
homotypic synonyms:
Echinocactus asterias Zucc.; links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr
2 Astrophytum capricorne (A.Dietr.) Britton & Rose distributionfilter: global
homotypic synonyms:
Echinocactus capricornis A.Dietr.; heterotypic synonyms:
Astrophytum crassispinum (H.Moeller) W.Haage & Sadovsky;
Astrophytum niveum (Kayser) W. Haage & Sad.;
Astrophytum senile Fric;
Astrophytum senile Frić;
links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr
4 Astrophytum mirum Halda & Panar. distributionfilter: global
links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr