Penicillus Bruguière 1789 (clam)
Bivalvia - Pandorida - Clavagellidae
Parent taxon: Clavagellidae according to L. R. Cox et al. 1969
Sister taxa: Ascaulocardium, Brechites, Brechitinae, Clavagella, Humphreyia, Pencillinae, Stirpulina
Subtaxa: Penicillus (Foegia), Penicillus (Penicillus), Penicillus (Pseudobrechites), Penicillus (Warnea)
Ecology: facultatively mobile infaunal suspension feeder