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Oral arms characterize Semaeostomeae, an order of large jellyfish. The oral arms (of which there are usually four) are located around the mouth and hold the stinging cells, or cnidocysts , which are used to inject potential prey (or potential predators) with venom.
Rhizostomeae is an order of jellyfish. Species of this order have neither tentacles nor other structures at the bell's edges. Instead, they have eight highly branched oral arms, along which there are suctorial minimouth orifices. (This is in contrast to other scyphozoans, which have four of these arms.) These oral arms become fused as they ...
Semaeostomeae (literally "flag mouths") is an order of large jellyfish characterized by four long, frilly oral arms flanking their quadrate mouths. The umbrella is domed with scalloped margins, and the gastrovascular system consists of four unbranched pouches radiating outwards from the central stomach; no ring canal is present.
However, the mushroom cap jellyfish has four short stinging "oral arms" that extend below its bell, according to the Virginia Institute of Marine Science. Full-grown, the mushroom cap jellyfish ...
The rarely encountered deep-sea jellyfish Stygiomedusa gigantea is another candidate for "largest jellyfish", with its thick, massive bell up to 100 cm (3 ft 3 in) wide, and four thick, "strap-like" oral arms extending up to 6 m (19 + 1 ⁄ 2 ft) in length, very different from the typical fine, threadlike tentacles that rim the umbrella of more ...
The underside of a mushroom jellyfish, showing the mouth, and oral arms Rhopilema verrilli , the mushroom cap jellyfish , is a species of jellyfish in the family Rhizostomatidae . They are cnidarian invertebrates distinguished by their mushroom-shaped medusae.
Members of the Semaeostomeae are known as "flag-mouth jellies" and are large jellyfish. They have an elongate manubrium composed of four oral arms. The edge of the bell bears flaps known as lappets and in the niches between these, there are usually eight rhopalia (sensory organs). Sometimes there are also hollow marginal tentacles.
Blubber jellyfish at Monterey Bay Aquarium showing two of the color variations (blue and brown) possible in this species.. Catostylus mosaicus is a member of the class Sycphozoa and order Rhizostomae, which distinguishes them as possessing eight oral arms instead of tentacles.