Ctenocystoidea
Sign in to saveCtenocystoidea is an extinct clade of echinoderms, which lived during the Cambrian and Ordovician periods. Unlike other echinoderms, ctenocystoids had bilateral symmetry, or were only very slightly asymmetrical. They are believed to be one of the earliest-diverging branches of echinoderms, with their bilateral symmetry a trait shared with other deuterostomes. Ctenocystoids were once classified in the taxon Homalozoa, also known as Carpoidea, alongside cinctans, solutes, and stylophorans. Homalozoa is now recognized as a polyphyletic group of echinoderms without radial symmetry. Ctenocystoids w
Wikidata facts
- Parent taxon
- Homalozoa
- Image
- Ctenocystis.png
Show 3 more facts
- taxon name
- Ctenocystoidea
- taxon rank
- class
- time period
- Middle Cambrian
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Encyclopedic overview
7 sectionsContents
- Description
- Classification
- Relationships
- Genera
- Distribution
- History
- References
Ctenocystoidea is an extinct clade of echinoderms, which lived during the Cambrian and Ordovician periods. Unlike other echinoderms, ctenocystoids had bilateral symmetry, or were only very slightly asymmetrical. They are believed to be one of the earliest-diverging branches of echinoderms, with their bilateral symmetry a trait shared with other deuterostomes. Ctenocystoids were once classified in the taxon Homalozoa, also known as Carpoidea, alongside cinctans, solutes, and stylophorans. Homalozoa is now recognized as a polyphyletic group of echinoderms without radial symmetry. Ctenocystoids were geographically widespread during the Middle Cambrian, with one species surviving into the Late Ordovician.
==Description==
Excerpted from Wikipedia’s “Ctenocystoidea” article, available under the CC BY-SA 4.0 licence.