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The Semaeostomeae (literally "flag mouths") are 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. They usually possess eight tentacles; four are per-radical and four are inter-radical. ==Taxonomy== The order consists of five families. ::: * Family Cyaneidae ::: * Family Drymonematidae〔Bayha, K. M., and M. N. Dawson (2010). ''New family of allomorphic jellyfishes, Drymonematidae (Scyphozoa, Discomedusae), emphasizes evolution in the functional morphology and trophic ecology of gelatinous zooplankton.'' The Biological Bulletin 219(3): 249–267〕 ::: * Family Pelagiidae ::: * Family Phacellophoridae〔Straehler-Pohl, I., C. L. Widmer, and A. C. Morandini (2011). ''Characterizations of juvenile stages of some semaeostome Scyphozoa (Cnidaria), with recognition of a new family (Phacellophoridae).'' Zootaxa 2741: 1-37〕 ::: * Family Ulmaridae 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Semaeostomeae」の詳細全文を読む スポンサード リンク
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