Convexella

Convexella is a genus of corals belonging to the family Primnoidae, first described by Frederick Bayer in 1996.
Species from WoRMS:

Convexella divergens
Convexella jungerseni
Convexella krampi
Convexella magelhaenica
Convexella murrayi

and from the Australian Faunal Directory:

''Convexella vanhoeffeni''