scyphozoan การใช้

• Scyphozoan jellyfish stings range from a twinge to tingling to agony.
• Most hydromedusae have shorter lifespans than the larger scyphozoan jellyfish.
• Scyphozoans have no durable hard parts, including no head, no skeleton, and no specialized organs for respiration or excretion.
• Scyphozoan and hydrozoan larvae have little yolk and most lack endosymbiotic algae, and therefore have to settle quickly and metamorphose into polyps.
• Nematocysts, which deliver the sting, are located mostly on the tentacles; Scyphozoans also have them around the mouth and stomach.
• Their diet consists principally of scyphozoans and salps; prowfish use their large mouths to tear chunks from the bells of jellyfish and ctenophores.
• Not all jellyfish are obviously " jelly-like . " There are many species of Scyphozoans and very little is known about them.
• Shortened forms of this life cycle are common, for example some oceanic scyphozoans omit the polyp stage completely, and cubozoan polyps produce only one medusa.
• Hydromedusan jellyfish differ from scyphozoan jellyfish because they have a muscular, shelf-like structure called a velum on the ventral surface, attached to the bell margin.
• An "'Oral arm "'is an anatomical structure of " true " sea jellies ( or Scyphozoans ), which belong to the class Scyphozoa.
• "Pelagia ", like other jellyfish in the scyphozoan order Semaeostomeae are mainly distinguished from the other orders by having simple oral arms with frilled or folded lips.
• Unlike most scyphozoan jellyfish that practice strobilation, or the process of dividing themselves into body segments, which become new individuals, nearly all stauromedusae develop directly into the adult form.
• The planula forms either from the fertilized egg of a medusa, as is the case in scyphozoans and some hydrozoans, or from a polyp, as in the case of anthozoans.
• "Ediacaria " was often classified as a jellyfish ( a Scyphozoan Cnidarian ), and has also been interpreted in many of the categories postulated to house the Ediacaran biota.
• Brittle stars, especially " Ophiomusium lymani ", were numerous as were the sea urchin " Echinus affinis ", the sea star " Neomorphaster forcipatus ", mysids and various scyphozoans.
• The coast of the southeastern Levant has been inundated by alien biota and it is unlikely that " M . stellata ", markedly different from all known scyphozoans in the Mediterranean, is a native species.
• They reasoned that since the conulate " Vendoconularia " exhibited six-fold symmetry, the conularids  then regarded as a sister group to the scyphozoan cnidarians  must be nested within the trilobozoa, making the trilobozoan group part of the cnidarian phylum.
• The venom of cubozoans is distinct from that of scyphozoans, and is used to catch prey ( small fish and invertebrates, including prawns and bait fish ) and for defence from predators, which include the blue swimmer crab ) and various species of turtle including the hawksbill sea turtle and flatback sea turtle.
• Whereas most scyphozoan jellyfish ( also called scyphomedusae ) have a complex life cycle with both the pelagic ( swimming ) jellyfish, or medusa, stage and a bottom-living polyp stage, " Pelagia " has adapted in such a way that the polyp stage is absent, thus direct development exists.
• Based on their extensive investigation of the disappearance of the golden jellyfish medusae, Dawson et al . determined that the most likely cause was an El Ni駉 weather event that raised the water temperature, with the result that the symbiotic algae ( Zooxanthellae ) that live within the golden jellyfish medusae and the syphistomae ( scyphozoan polyps ) could not survive.