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The Scyphozoa are an exclusively marine class of the phylum Cnidaria, [2] referred to as the true jellyfish (or "true jellies"). The class name Scyphozoa comes from the Greek word skyphos (σκύφος), denoting a kind of drinking cup and alluding to the cup shape of the organism. [3] Scyphozoans have existed from the earliest Cambrian to the ...
Scyphozoa is the group commonly known as "true jellyfish" and occur in tropical, temperate and polar seas worldwide. Scyphozoans generally have planula larvae that develop into sessile polyps. These reproduce asexually, producing similar polyps by budding, and then either transform into medusae, or repeatedly bud medusae from their upper ...
The body of Atolla wyvillei has a bell shape, of around 20–174 mm (0.79–6.85 in) in diameter, and is rimmed by several moderately long tentacles, [clarification needed] including a single, long, hypertrophied tentacle, which has several purposes, including aid in predation as well as aid in reproduction. These jellyfish do not have a ...
Its body shape shifts as it moves but is generally long and narrow. It has two “long tentacles” covered in “unique,” “giant” bulbs. One photo shows a large Zancleopsis jellyfish ...
Helmet jellyfish feeding on an armhook squid underwater. Helmet jellyfish reach a body size of up to 30 cm (12 in). The average wet weight of the jellyfish is 540 grams. [2] Overall, helmet jellyfish have a uniform size. [3] They consist 90% of water, the rest being tissue and gelatinous mass, which give the animals their form.
Protein and medusae analysis from Michael N. Dawson of the University of New South Wales confirm that Cyanea annaskala is a valid species, morphologically distinct based on differences in bell mass, number of nematocyst clusters, pits in coronal muscle folds, and other morphological characteristics. Some of the other morphological ...
In class Scyphozoa, the medusa stage is dominant, and the polyp stage may or may not be present, depending on the family. In those scyphozoans that have the larval planula metamorphose into a polyp, the polyp, also called a "scyphistoma," grows until it develops a stack of plate-like medusae that pinch off and swim away in a process known as ...
Modern groups of animals can be grouped by the arrangement of their body structures, so are said to possess different body plans. A body plan, Bauplan (pl. German: Baupläne), or ground plan is a set of morphological features common to many members of a phylum of animals. [1] The vertebrates share one body plan, while invertebrates have many.