Biology:Thaumactena
Thaumactena is an extinct monotypic genus of scleroctenophoran (a type of stem-group ctenophore[1][2][3]) that lived during Cambrian Stage 3, around 520 Ma.[4] The type and only species is Thaumactena ensis.[4]
Description
Two specimens are known, the holotype (ELEL-SJ081427A, an adult), and the paratype (ELEL-SJ081563, a juvenile), both having a length-width ratio of 10:1.[4] The oral region expands outward, forming an "oral skirt."[4] Thaumactena is distinguished from other scleroctenophorans by the possession of a streamlined body, similar to chaetognaths (arrow worms), suggesting that, in life, it was an agile swimmer.[4]
Phylogeny
Thaumactena is placed in the Scleroctenophora, as it and other members of the class possess an internal skeleton.[4]
See also
- Chengjiang biota
References
- ↑ Zhao, Yang; Vinther, Jakob; Parry, Luke A.; Wei, Fan; Green, Emily; Pisani, Davide; Hou, Xianguang; Edgecombe, Gregory D. et al. (2019). "Cambrian Sessile, Suspension Feeding Stem-Group Ctenophores and Evolution of the Comb Jelly Body Plan". Current Biology 29 (7): 1112–1125.e2. doi:10.1016/j.cub.2019.02.036. http://www.cell.com/article/S0960982219302064/pdf. Retrieved 2024-12-18.
- ↑ Parry, Luke A.; Lerosey-Aubril, Rudy; Weaver, James C.; Ortega-Hernández, Javier (2021). "Cambrian comb jellies from Utah illuminate the early evolution of nervous and sensory systems in ctenophores". iScience 24 (9). doi:10.1016/j.isci.2021.102943. PMID 34522849. PMC 8426560. http://www.cell.com/article/S2589004221009111/pdf. Retrieved 2024-12-18.
- ↑ Klug, Christian; Kerr, Johanne; Lee, Michael S. Y.; Cloutier, Richard (2021-09-24). "A late-surviving stem-ctenophore from the Late Devonian of Miguasha (Canada)". Scientific Reports 11 (1). doi:10.1038/s41598-021-98362-5. ISSN 2045-2322. PMID 34561497. PMC 8463547. https://www.nature.com/articles/s41598-021-98362-5.pdf. Retrieved 2024-12-18.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Cite error: Invalid
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