Filozoa

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For an explanation of very similar terms, see Holozoa.
Filozoans
Elephant-ear-sponge.jpg
Orange elephant ear sponge, Agelas clathrodes, in foreground. Two corals in the background: a sea fan, Iciligorgia schrammi, and a sea rod, Plexaurella nutans.
Scientific classification e
(unranked): Unikonta
(unranked): Opisthokonta
(unranked): Holozoa
(unranked): Filozoa
Shalchian-Tabrizi et al., 2008
Subgroups

The Filozoa are a monophyletic grouping within the Opisthokonta. They include animals and their nearest unicellular relatives (those organisms which are more closely related to animals than to fungi or Mesomycetozoa).[1]

Three groups are currently assigned to the clade Filozoa:

Etymology[edit]

From Latin filum meaning "thread" and Greek zōion meaning "animal".

Cladogram[edit]

The most up to date cladogram is[2]

Opisthokonta  
Holomycota

Fungi


Discicristoidea

Nucleariida



Fonticulida




Holozoa
Teretosporea

Mesomycetozoa



Corallochytrium



Filozoa

Filasterea




Choanoflagellatea



Animalia






Characteristics[edit]

The ancestral opisthokont cell is assumed to have possessed slender filose (thread-like) projections or 'tentacles'. In some opisthokonts (Mesomycetozoa and Corallochytrium) these were lost. They are retained in Filozoa, where they are simple and non-tapering, with a rigid core of actin bundles (contrasting with the flexible, tapering and branched filopodia of nucleariids and the branched rhizoids and hyphae of fungi). In choanoflagellates and in the most primitive animals, namely sponges, they aggregate into a filter-feeding collar around the cilium or flagellum; this is thought to be an inheritance from their most recent common filozoan ancestor.[1]

References[edit]

  1. ^ a b Shalchian-Tabrizi K., Minge M.A., Espelund M.; et al. (7 May 2008). Aramayo, Rodolfo, ed. "Multigene phylogeny of choanozoa and the origin of animals". PLoS ONE 3 (5): e2098. doi:10.1371/journal.pone.0002098. PMC 2346548. PMID 18461162.  open access publication - free to read
  2. ^ Parfrey, Laura Wegener; Lahr, Daniel J. G.; Knoll, Andrew H.; Katz, Laura A. (16 August 2011). "Estimating the timing of early eukaryotic diversification with multigene molecular clocks". Proceedings of the National Academy of Sciences 108 (33): 13624–13629. doi:10.1073/pnas.1110633108. ISSN 0027-8424. PMC 3158185. PMID 21810989.