海綿 - clade @ ウィキ

↑後生動物

海綿の系統

海綿 / 海綿動物 (Porifera) = 側生動物 (Parazoa)

1. 石灰海綿 (Calcarea = Calcispongia)
2. 石英海綿 / ガラス海綿 (Silicea = Silicispongia)
   1. 普通海綿 (Desmospongea)
   2. 六放海綿 (Hexactinellida) = 合胞体類 (Symplasma)

• Silva et al. 2007. Phylogenetic position of Placozoa based on large subunit (LSU) and small subunit (SSU) rRNA genes
• Schierwater et al. 2009. Concatenated Analysis Sheds Light on Early Metazoan Evolution and Fuels a Modern “Urmetazoon” Hypothesis