Hartlaub, 1897

Description
[M.haeckeli-medusa ] Umbrella bell-shaped , slightly higher than wide, without apical process; exumbrella with scattered nematocysts; jelly moderately thick; velum broad. Four radial canals and ring canal narrow. Manubrium short cylindrical, not extending beyond umbrella margin; basal portion of stomach with large transparent endoderm cells. Mouth circular, simple, margin armed with nematocysts. Gonads completely surrounding manubrium, except for basal third; eggs amoeboid, developing into actinulae in bell cavity. Four perradial rounded marginal tentacle bulbs, each with 3-5 solid tentacles, tentacles irregularly distributed, with scattered clusters of nematocysts; ocelli absent.

Size
Umbrella 2 mm high.

Colour
Manubrium dark grey with dark brown pigment granules; marginal bulbs brown.

Ecology and depth range
Medusa and hydroid are planktonic, the hydrant is free-swimming; medusae mainly found during the summer.

Distribution in the North Sea
Common in the North Sea.

World distribution
Unknown.

[After Russell, 1950a; Russell, 1953a; Kramp, 1961]

Kingdom Animalia
Phylum Cnidaria
Superclass Hydrozoa
Class Leptolida
Subclass Anthoathecatae
Order Capitata
Family Margelopsidae
Genus Margelopsis
Species Margelopsis haeckeli

Status in World Register of Marine Species

Accepted name: Margelopsis haeckeli Hartlaub, 1897

Sorry, there are no scientific synonyms and common names available for this species

Browne, E.T., 1903. Report on some Medusae from Norway and Spitzbergen. Bergens Museums Årbog, 1(4): 1-36, with 5 plates.

Edwards, C., 1968. Water movements and the distribution of Hydromedusae in British and adjacent waters. Sarsia 34: 331-346.

Kramp, P.L., 1961. Synopsis of the medusae of the world. Journal of the Marine Biological Association of the United Kingdom 40: 1-469.

Russell, F.S., 1950a. Hydromedusae. Family: Tubulariidae (contd.); Family: Margelopsidae. Fiches d'Identification du Zooplancton, 28 (1950). Conseil International pour l'Exploration de la Mer, Kopenhagen.

Russell, F.S., 1953a. The medusae of the British Isles. Anthomedusae, Leptomedusae, Limnomedusae, Trachymedusae, and Narcomedusae. Cambridge University Press, 530 pp. 319 figures, 35 plates.

Tulp, A.S., 2001b. Over Eucheilota flevensis Van Kampen, 1922 en enige andere hydromedusen (deel 2). Het Zeepaard, 61(2): 33-43.

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