Bold ranks show taxa that will be shown in taxoboxes
because rank is principal or always_display=yes.

Ancestral taxa
Domain: Eukaryota /displayed  [Taxonomy; edit]
Clade: Amorphea  [Taxonomy; edit]
Clade: Obazoa  [Taxonomy; edit]
(unranked): Opisthokonta  [Taxonomy; edit]
(unranked): Holozoa  [Taxonomy; edit]
(unranked): Filozoa  [Taxonomy; edit]
Clade: Choanozoa  [Taxonomy; edit]
Kingdom: Animalia  [Taxonomy; edit]
Phylum: Porifera (?) /?  [Taxonomy; edit]
Genus: Calathium  [Taxonomy; edit]


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Parent: Porifera/? [Taxonomy; edit]
Rank: genus (displays as Genus)
Link: Calathium
Extinct: yes
Always displayed: yes (major rank)
Taxonomic references: Li, Qijian; Li, Yue; Wang, Jianpo; Kiessling, Wolfgang (May 2015). "Early Ordovician lithistid sponge– Calathium reefs on the Yangtze Platform and their paleoceanographic implications". Palaeogeography, Palaeoclimatology, Palaeoecology. 425: 84–96. doi:10.1016/j.palaeo.2015.02.034.
Parent's taxonomic references: Sponge Paraphyly is now "generally accepted" (according to, for example, the article at Porifera). For a recent reference summarizing this perspective, see Nielsen, Claus (2010). Animal Evolution: Interrelationships of the Living Phyla (third ed.). ISBN 9780199606023.. This should be denoted in the link by double quotation marks ("").