Xylocephalidae

Xylocephalidae includes all Dome-Headed Gulper on Sagan 4.

Domain: Eukaryota
 * Kingdom: Mancerxa
 * Phylum: Phytozoa
 * Class: Terraphytozoa
 * Order: Barbellaphyta
 * Family: Xylocephalidae
 * ''Ceracorytha cryptoschovel
 * ''Ceracorytha protoceros
 * ''Plenthog chromedomem
 * ''Plenthog crownedome
 * ''Plenthog fatapus
 * ''Plenthog stygimoloch