| Rhacostoma | |
|---|---|
| |
Scientific classification 
| |
| Domain: | Eukaryota |
| 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 | |
Rhacostoma is a genus of aequoreid hydrozoans. It is monotypic with a single species, Rhacostoma atlanticum. It has been reported from the Atlantic coastline of North America, Colombia, western and central Africa. The polyp stage is unknown.
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. Specimens found in the northern waters tend to be transparent, while those found further south are tinted pink. The broad stomach gives rise to 80–100 non-branching radial canals. Tentacles are slightly more numerous than radial canals and possess elongated conical bulbs.
References
- ^ Kramp, P. L. (1961). Synopsis of the medusae of the world. Journal of the Marine Biological Association of the United Kingdom 40: 1–469. P. 210 The full text Archived 2011-09-30 at the Wayback Machine
- Bouillon, J., Gravili, C., Pagès, F., Gili, J. M., Boero, F. (2006). An introduction to Hydrozoa. Mémoires du Muséum national d’Histoire naturelle 194: 1– 591, p. 277.
- Goodwin, G., Bogert, C. M., Gilliard, E., Coates, C. W. The Illustrated Encyclopedia of Animal Life. Odham Books, 1961, vol. 13, p. 1666.
| Taxon identifiers | |
|---|---|
| Rhacostoma atlanticum | |
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