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Galeactena

Galeactena
Temporal range: Cambrian Stage 3[1]
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Ctenophora
Class: †Scleroctenophora
Genus: †Galeactena
Ou et al., 2015
Species:
†G. hemispherica
Binomial name
†Galeactena hemispherica
Ou et al., 2015

Galeactena is an extinct genus of scleroctenophoran comb jellies (members of the phylum Ctenophora) that lived during the early Cambrian period as a member of the Chengjiang biota. This genus only contains one species, Galeactena hemispherica, making it monotypic.[2][3][4]

It was a planktonic genus, drifting through the ocean and filter feeding.[5]

Description

The anatomy of Galeactena is globose, bearing resemblance to an upside-down garlic bulb. All specimens of Galeactena have a consistent vaulted hemispherical shape with little evidence of its body being twisted or distorted. It has eight rows of cilia which it uses to propel through the water.[2][6] The body of Galeactena and its apical organ is supported by a external organic skeleton.[7]

Taxonomy

This genus is a member of the taxonomic class Scleroctenophora, making it related to genera such as Batofasciculus. However it was most closely related to genera such as Maotianoascus.[2][3]

References

  1. ^ Ou, Qiang; Xiao, Shuhai; Han, Jian; Sun, Ge; Zhang, Fang; Zhang, Zhifei; Shu, Degan (3 July 2015). "A vanished history of skeletonization in Cambrian comb jellies". Science Advances. 1 (6) e1500092. American Association for the Advancement of Science. Bibcode:2015SciA....1E0092O. doi:10.1126/sciadv.1500092. eISSN 2375-2548. PMC 4646772. PMID 26601209. S2CID 390519.
  2. ^ a b c "Science". AAAS. doi:10.1126/sciadv.1500092. PMC 4646772. PMID 26601209. Retrieved 2026-07-14.
  3. ^ a b "WoRMS - World Register of Marine Species - Out of scope". marinespecies.org. Retrieved 2026-07-14.
  4. ^ "Galeactena". www.gbif.org. Retrieved 2026-07-14.
  5. ^ "600-million-year-old fossils that reveal the world's first animals – Museum Crush". 2019-05-28. Retrieved 2026-07-14.
  6. ^ "Galeactena hemispherica — Chris Otley". chrisotley.com. Retrieved 2026-07-14.
  7. ^ Zhao, Yang; Vinther, Jakob; Parry, Luke A.; Wei, Fan; Green, Emily; Pisani, Davide; Hou, Xianguang; Edgecombe, Gregory D.; Cong, Peiyun (2019-04-01). "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. hdl:1983/40a6bcb8-a740-482c-a23c-7d563faea5c5. ISSN 0960-9822. PMID 30905603.
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