Maxmuelleria
Maxmuelleria is a genus of echiurans belonging to the family Bonelliidae. The genus has almost cosmopolitan distribution. Species:

Maxmuelleria aulacoferum 
Maxmuelleria faex 
Maxmuelleria gigas 
Maxmuelleria lankesteri 
Maxmuelleria verrucosum

References

Echiurans
Annelid genera