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Colobonema sericeum
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Cnidaria
Class:	Hydrozoa
Order:	Trachymedusae
Family:	Rhopalonematidae
Genus:	Colobonema
Species:	C. sericeum
Binomial name
Colobonema sericeum Vanhöffen, 1902

Colobonema sericeum is a species of deep-sea hydrozoan in the family Rhopalonematidae that was first described in 1902. This semi-transparent organism is found in the mesopelagic zone, has 32 tentacles, and has a bell diameter of up 45 mm. They are holoplanktonic and never attach to the seafloor as part of their polyp life cycle, but instead have embryos that develop directly into a small, swimming medusae.

References

1. "Colobonema sericeum Vanhöffen, 1902". WoRMS. World Register of Marine Species. Retrieved 20 September 2022.
2. Hirose, Euichi; Sakai, Daisuke; Iida, Akane; Obayashi, Yumiko; Nishikawa, Jun (2021). "Exumbrellar surface of jellyfish: a comparative fine structure study with remarks on surface reflectance". Zoological Science. 38 (2): 170–178. doi:10.2108/zs200111. PMID 33812356.
3. ^ Raskoff, K (2001). "The impact of El Niño events on populations of mesopelagic hydromedusae". Hydrobiologia. 451: 121–129. doi:10.1023/A:1011812812662. S2CID 37298417.

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• Rhopalonematidae
• Cnidarians of the Atlantic Ocean
• Cnidarians of the Indian Ocean
• Cnidarians of the Pacific Ocean
• Animals described in 1902
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