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| Pelagia benovici | |
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| Tweet Topic Started: May 16 2014, 05:46 PM (1,358 Views) | |
| Taipan | May 16 2014, 05:46 PM Post #1 |
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Pelagia benovici![]() Scientific classification Kingdom: Animalia Phylum: Cnidaria Class: Scyphozoa Order: Semaeostomeae Family: Pelagiidae Genus: Pelagia Species: Pelagia benovici Pelagia benovici (Piraino, Aglieri, Scorrano & Boero, 2014) is a jellyfish in the family Pelagiidae, along with Pelagia noctiluca. In Latin, Pelagia means "of the sea". The team who discovered this jellyfish named it benovici, after a late colleague, Adam Benovic. Classification P. benovici is an animal, thus non-photosynthetic, multicellular eukaryote, in the phylum Cnidaria. Being a cnidarian it is diploblastic, having an ectoderm and endoderm separated by an ectodermally derived mesoglea that can be cellular or acellular. It is a member of the cnidarian class Scyphozoa and adapted to a pelagic mode of life. 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. The male and female jellyfish spawn respectively sperm and eggs, which develop directly into young jellyfish. 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. The order semaestomae comprises three families: Pelagiidae, Cyaneidae,and Ulmaridae, distinguishable by the following characters: 1. Gastrovascular cavity divided by radial septa into rhopalar and tentacular pouches. a. Pouches simple and unbranched – Pelagiidae b. Pouches branched – Cyaneidae 2. Gastrovascular system in form of unbranched and branching canals, or with anastomosing radial canals – Ulmaridae In addition, members of the Pelagiidae have no ring canal, and the marginal tentacles arise from umbrella margin. Beautiful, Golden Jellyfish Invading Fisher's Nets Is a New Species Hundreds of golden jellyfish that clogged fishing nets off the coast of Venice, Italy, are in fact a new species, experts say. Jane J. Lee National Geographic PUBLISHED MAY 15, 2014 Last fall, fishers in the Adriatic Sea near Venice, Italy, pulled up nets full of hundreds of two-inch-wide (five centimeter), golden jellyfish. Having never seen the jellyfish before, the fishers sent pictures to researchers, who identified the beautiful interlopers as a new species. About two or three new jellyfish species pop up every year, says Claudia Mills, a marine biologist at the University of Washington in Friday Harbor. However, finding such a conspicuous newcomer in a relatively shallow body of water close to shore is extremely rare, says Stefano Piraino, a jellyfish researcher at the Università del Salento in Lecce, Italy. Piraino and his colleagues published their description of the new jellyfish—dubbed Pelagia benovici—this month in the journal Zootaxa. The find comes as a surprise to scientists because the Adriatic Sea is one of the best studied bodies of water in the world. The fact that this jellyfish avoided detection until last year suggests that it is a fairly recent arrival, the study authors assert. This means that it's probably an invasive species, Piraino said in an email interview. The Gulf of Venice in the Adriatic Sea is a hot spot for alien species introduction, he explains. Intense transcontinental shipping activity, as well as the aquaculture trade, provides plenty of opportunities for invasive species to set up shop. "We believe this species entered the Mediterranean Sea by ballast water transfer [by ships]," Piraino says. Experts aren't sure where P. benovici comes from, but it's a good bet that it could be native to the Indian Ocean, says marine biologist Mills. It's an understudied part of the world known for a surprising amount of diversity in marine organisms. Researchers are just starting to get to know P. benovici, and much work remains to be done. They aren't sure how painful its stings are, since many of the fishers who handled the jellyfish wore gloves. And they aren't sure what it eats, although closely related species are carnivores that eat fish eggs and larvae, as well as tiny crustaceans, says Piraino. http://news.nationalgeographic.com/news/2014/05/140515-new-jellyfish-species-adriatic-sea-animals-science/ ![]() ![]() ![]() ![]() PDF : http://www.mapress.com/zootaxa/2014/f/zt03794p468.pdf Edited by Taipan, May 20 2014, 06:38 PM.
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