Phylum Porifera Grant, 1836 - sponges
Period: Proterozoic - Present [2500 Mya - present]; Status: extant; Count: [o†f] 3c;29o;74f; †1c;9o;134f [17 Jul 2018]
   Class Hexactinellida Schmidt, 1870 - hexactinellids
  Period: Early Cambrian - Present [541 Mya - present]; Status: extant; Count: [f†f] 5o;15f; †1o;41f [17 Jul 2018]
     Subclass Hexasterophora Schulze, 1886
    Period: Ordovician - Present [485.4 Mya - present]; Status: extant; Count: [f†f] 3o;13f; †26f;233g [17 Jul 2018]
       Genus †Pinnatispongia Xiping & Knoll, 1996
      Status: fossil; Count: -