Pachyrhachis Schrammen, 1937 Dataset GBIF Backbone Taxonomy Rank GENUS Classification kingdom Animalia phylum Porifera class Hexactinellida order Lychniscosida family Ventriculitidae genus Trochobolus Name Homonyms Pachyrhachis Haas, 1979 Pachyrhachis Schrammen, 1937 Pachyrhachis A.Rich.