Cladocora caespitosa (Linnaeus, 1767)
pillow coral / madrepora pagnotta

Location:
Found in less than 2m depth, San Saba, Messina, Sicilia.

Links:
World Register of Marine Species
https://www.marinespecies.org/aphia.php?p=taxdetails&id=135146
SeaLifeBase
https://www.sealifebase.ca/summary/Cladocora-caespitosa.html
Global Biodiversity Information Facility (GBIF)
https://www.gbif.org/species/2258965
iNaturalist
https://www.inaturalist.org/taxa/97903-Cladocora-caespitosa

International Union for Conservation of Nature (IUCN) status:
Endangered (EN) on the IUCN Red List (Global)
Endangered (EN) on the IUCN Red List (Mediterranean)
Minor Preoccupazione (LC) on the IUCN (Italy) Lista Rossa