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''Eldonia'' is an extinct soft-bodied animal of unknown affinity, best known from the Fossil Ridge outcrops of the Burgess Shale, particularly in the 'Great ''Eldonia'' layer' in the Walcott Quarry. In addition to the 550 collected by Walcott, Species also occur in the Chengjiang biota, and in Upper Ordovician strata of Morocco. Walcott's original interpretation as a holothurian was rapidly disputed. Alternative affinities to be suggested, which did not stand the test of time, included the siphonophores and a coelenterate medusa. It takes the form of a round, medusoid disk (which originally led to suggestions of a jellyfish affinity) with a C-shaped gut trace. The gut is recalcitrant and can be extracted using HF acid. The organism is frequently found in association with the lobopod ''Microdictyon'', which is presumed to have fed on ''Eldonia''. The eldoniids form a clade that also includes ''Paropsonema'', ''Rotadiscus'', and ''Stellostomites''. Eldonia berbera.jpg|''Eldonia berbera'' Eldonia ludwigi, Burgess Shale.jpg|''Eldonia ludwigii, '' Wolcott Quarry. About 4 cm long ==External links== * 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「Eldonia」の詳細全文を読む スポンサード リンク
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