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Clash Royale CLAN TAG #URR8PPP New World vultures, such as the California condor, were placed incertae sedis within the Class Aves until the recognition of the new Order Cathartiformes. Plumalina plumaria Hall, 1858 (6.3 cm tall), Upper Devonian of western New York State, USA. Workers usually assign this organism to the hydrozoans (Phylum Cnidaria , Class Hydrozoa ) or the gorgonarians (Phylum Cnidaria , Class Anthozoa , Order Gorgonaria ), but it’s probably safest to refer to it as incertae sedis. Incertae sedis (Latin for "of uncertain placement") [1] is a term used for a taxonomic group where its broader relationships are unknown or undefined. [2] Alternatively, such groups are frequently referred to as "enigmatic taxa". [3] In the system of open nomenclature, uncertainty at specific taxonomic levels is indicated by incertae familiae (of uncertain family), incerti subordinis (of uncertain suborder), incerti ordinis (of uncertain order) and similar term...

Clash Royale CLAN TAG #URR8PPP Not to be confused with trilobite. Trilobozoa Temporal range: Late Ediacaran, around 558–550 Ma PreЄ Є O S D C P T J K Pg N Scientific classification Kingdom: Animalia Subkingdom: Eumetazoa Phylum: Trilobozoa Fedonkin, 1985 [ nom. transl. Runnegar, 1992 ex Class Trilobozoa Fedonkin, 1985] Family and Genera See article Trilobozoa ("three-lobed animals") is a taxon of extinct organisms which displayed tri-radial symmetry. Fossils of trilobozoans are restricted to marine strata of the Late Ediacaran period — prior to the Cambrian explosion of more modern life forms. The taxonomic affinities of this groups are open to debate. Ivantsov and Fedonkin (2002) place them among the cnidarians. They reasoned that since the conulate Vendoconularia exhibited six-fold symmetry, the conularids — then regarded as a sister group to the scyphozoan cnidarians — must be nested within the trilobozoa, making the trilobozoan g...

Clash Royale CLAN TAG #URR8PPP Part of a series on The Cambrian explosion Fossil localities Burgess Shale Chengjiang Sirius Passet Doushantuo Key organisms Ediacara biota Kimberella Vernanimalcula Burgess-type Marrella Anomalocaridids Halwaxiids Opabinia Odontogriphus Small shelly fauna Helcionellids Evolutionary concepts Trends Cambrian substrate revolution Themes Cladistics Convergent evolution Stem and crown groups v t e The Cambrian explosion or Cambrian radiation [1] was an event approximately 541 million years ago in the Cambrian period when most major animal phyla appeared in the fossil record. [2] [3] It lasted for about 20 [4] [5] –25 [6] [7] million years. It resulted in the divergence of most modern metazoan phyla. [8] The event was accompanied by major diversification of other organisms. [note 1] Before the Cambrian explosion, [note 2] most organisms were simple, composed of individual cells occasionally organized into colonies. Over the following 70 to 8...