It sounds like the Acan Lords we all know and love have been recently re-classified as Micromussa and not Acanthastrea.
https://reefbuilders.com/2016/02/05/micromussa-lordhowensis-amicromussa-lordhowensis-acan-lords-are-now-micro-lordscan-lords-are-now-a-species-of-micro/
February 5 2016, Jake Adams –
Micromussa lordhowensis is the new designation for one of the reef aquarium hobby’s most popular species of large polyp stony corals. After a decade of enjoying this colorful and fleshy coral in aquariums as Acan Lords, we’re now going to have to come around to calling them Micro Lords.
This is quite confusing since we’ve always differentiated between Acanthastrea and Micromussa as ‘Acans’ and ‘Micros’. Now we come to learn that the most iconic of all Acans, the ‘Acan’ Lords are now considered to be a species of Micromussa. In retrospect this makes sense because the uniform circular polyps of ‘Lords, together with their copious fleshy tissue and finely beaded texture is much more similar to the polyps of Micromussa than Acanthastrea.
Micromussa lordhowensis is the new designation for one of the reef aquarium hobby’s most popular species of large polyp stony corals. After a decade of enjoying this colorful and fleshy coral in aquariums as Acan Lords, we’re now going to have to come around to calling them Micro Lords.
This is quite confusing since we’ve always differentiated between Acanthastrea and Micromussa as ‘Acans’ and ‘Micros’. Now we come to learn that the most iconic of all Acans, the ‘Acan’ Lords are now considered to be a species of Micromussa. In retrospect this makes sense because the uniform circular polyps of ‘Lords, together with their copious fleshy tissue and finely beaded texture is much more similar to the polyps of Micromussa than Acanthastrea.
https://reefbuilders.com/2016/02/05/micromussa-lordhowensis-amicromussa-lordhowensis-acan-lords-are-now-micro-lordscan-lords-are-now-a-species-of-micro/