Rhacostoma

Rhacostoma
Scientific classification
Kingdom:	Animalia
Phylum:	Cnidaria
Class:	Hydrozoa
Order:	Leptothecata
Family:	Aequoreidae
Genus:	Rhacostoma ; L. Agassiz, 1850
Species:	R. atlanticum
Binomial name
	Rhacostoma atlanticum; L. Agassiz, 1850

Last updated September 11, 2025

Rhacostoma is a genus of aequoreid hydrozoans. It is monotypic with a single species, Rhacostoma atlanticum Or Lined Water Jellyfish. It has been reported from the Atlantic coastline of North America, Colombia, western and central Africa.^[1] The polyp stage is stolonal, with a tubular hydrotheca and 15 moniliform tentacles when completely extend.^[2]

Morphology

The medusae reach up to 30–40 cm (12–16 in) in diameter with the bell height 3–4 times less than the width.^[1] Specimens found in the northern waters tend to be transparent, while those found further south are tinted pink.^[3] The broad stomach gives rise to 80–100 non-branching radial canals.^[1] Tentacles are slightly more numerous than radial canals and possess elongated conical bulbs.^[1]

References

1 2 3 4 Kramp, P. L. (1961). Synopsis of the medusae of the world. Journal of the Marine Biological Association of the United Kingdom40: 1–469. P. 210 The full text Archived 2011-09-30 at the Wayback Machine
↑ Resgalla, C.; Petri, L.; da Silva, B. G. Teodoro; Brilha, R. T.; Araújo, S. A.; Almeida, T. C. M. (2019-06-20). "Outbreaks, coexistence, and life cycle of jellyfish species in relation to abiotic and biological factors along a South American coast" . Hydrobiologia. 839 (1): 87–102. doi:10.1007/s10750-019-03998-0. ISSN 0018-8158.
↑ Goodwin, G., Bogert, C. M., Gilliard, E., Coates, C. W. The Illustrated Encyclopedia of Animal Life. Odham Books, 1961, vol. 13, p. 1666.

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[kramp-1] 1 2 3 4 Kramp, P. L. (1961). Synopsis of the medusae of the world. Journal of the Marine Biological Association of the United Kingdom40: 1–469. P. 210 The full text Archived 2011-09-30 at the Wayback Machine

[2] Resgalla, C.; Petri, L.; da Silva, B. G. Teodoro; Brilha, R. T.; Araújo, S. A.; Almeida, T. C. M. (2019-06-20). "Outbreaks, coexistence, and life cycle of jellyfish species in relation to abiotic and biological factors along a South American coast" . Hydrobiologia. 839 (1): 87–102. doi:10.1007/s10750-019-03998-0. ISSN 0018-8158.

[goodwin-3] Goodwin, G., Bogert, C. M., Gilliard, E., Coates, C. W. The Illustrated Encyclopedia of Animal Life. Odham Books, 1961, vol. 13, p. 1666.

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