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| accessdate = 2009-08-12}}</ref> with a C-shaped gut trace. The gut is recalcitrant and can be extracted using [[HF acid]].<ref name=Butterfield1990>{{cite jstor|2400788}}</ref> The organism is frequently found in association with the lobopod ''[[Microdictyon]]'', which is presumed to have fed on ''Eldonia''.<ref name='Zhang2007'>{{cite doi | 10.2110/palo.2006.p06-085r }}</ref>
| accessdate = 2009-08-12}}</ref> with a C-shaped gut trace. The gut is recalcitrant and can be extracted using [[HF acid]].<ref name=Butterfield1990>{{cite jstor|2400788}}</ref> The organism is frequently found in association with the lobopod ''[[Microdictyon]]'', which is presumed to have fed on ''Eldonia''.<ref name='Zhang2007'>{{cite doi | 10.2110/palo.2006.p06-085r }}</ref>


The '''eldoniids''' form a clade that also includes ''[[Paropsonema]]'', ''[[Rotadiscus]]'', and ''[[Stellostomites]]''.<ref>{{cite doi|10.1371/journal.pone.0009586.}}</ref>
The '''eldoniids''' form a clade that also includes ''[[Paropsonema]]'', ''[[Rotadiscus]]'', and ''[[Stellostomites]]''.<ref>{{Cite journal| volume = 5| title = Tentaculate fossils from the Cambrian of Canada (British Columbia) and China (Yunnan) interpreted as primitive deuterostomes | first4 = D.| issue = 3| pages = e9586| journal = PLoS ONE| pmc = 2833208| doi = 10.1371/journal.pone.0009586| last4 = Soares| last1 = Caron| year = 2010| pmid = 20221405 | first3 = D. | first1 = J.| last2 = Conway Morris| last3 = Shu | first2 = S.| editor1-last = Soares| editor1-first = Daphne}}</ref>
<gallery widths="250px" heights="220px" >
<gallery widths="250px" heights="220px" >
Eldonia berbera.jpg|''Eldonia berbera''
Eldonia berbera.jpg|''Eldonia berbera''

Revision as of 11:24, 29 August 2015

Eldonia
Temporal range: Cambrian Stage 3–Middle Ordovician
Eldonia ludwigii from the middle Cambrian Burgess Shale.
Scientific classification
Kingdom:
Animalia
Superphylum:
Ambulacraria
(unranked):
Cambroernida
(unranked):
Paropsonemida
Family:
Eldoniidae

Walcott 1911
Genus:
Eldonia
Species:
  • E. ludwigii Walcott 1911
  • E. eumorpha Sun & Hou 1987
  • E. berbera ALESSANDRELLO 2003[1]
Synonyms
  • Yunnanomedusa[2]
  • Stellostomites[2]

Eldonia is an extinct soft-bodied animal of unknown affinity,[3] best known from the Fossil Ridge outcrops of the Burgess Shale, particularly in the 'Great Eldonia layer' in the Walcott Quarry.[4] In addition to the 550 collected by Walcott,[5] Template:Gpb abundance Species also occur in the Chengjiang biota,[2] and in Upper Ordovician strata of Morocco.

Walcott's original interpretation as a holothurian was rapidly disputed.[6] Alternative affinities to be suggested, which did not stand the test of time, included the siphonophores[7][8][9] and a coelenterate medusa.[10]

It takes the form of a round, medusoid disk (which originally led to suggestions of a jellyfish affinity)[11] with a C-shaped gut trace. The gut is recalcitrant and can be extracted using HF acid.[12] The organism is frequently found in association with the lobopod Microdictyon, which is presumed to have fed on Eldonia.[13]

The eldoniids form a clade that also includes Paropsonema, Rotadiscus, and Stellostomites.[14]

  • Eldonia berbera
    Eldonia berbera
  • Eldonia ludwigii, Wolcott Quarry. About 4 cm long
    Eldonia ludwigii, Wolcott Quarry. About 4 cm long

External links

References

  1. ^ ALESSANDRELLO Anna; A BRACCHI Giacomo (2003). "Eldonia berbera n. sp., a new species of the enigmatic genus Eldonia Walcott, 1911 from the Rawtheyan (Upper Ordovician) of little Atlas (Erfoud, Tafilalt, Morocco)". Atti della Società italiana di scienze naturali e del Museo civico di storia naturale in Milano. 144 (2). Milano, ITALIE: Società italiana di scienze naturali: 337–358. ISSN 0037-8844.
  2. ^ a b c CHEN, J-Y.; M-Y. ZHU,; G. Q. ZHOU (1995). "The early Cambrian medusiform metazoan Eldonia from the Chengjiang Lagerstätte" (PDF). Acta Palaeontologica Polonica. 40: 213–244.{{cite journal}}: CS1 maint: extra punctuation (link)
  3. ^ Attention: This template ({{cite jstor}}) is deprecated. To cite the publication identified by jstor:2401005, please use {{cite journal}} with |jstor=2401005 instead.
  4. ^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1144/0016-76492007-023 , please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.1144/0016-76492007-023 instead.
  5. ^ Attention: This template ({{cite jstor}}) is deprecated. To cite the publication identified by jstor:1303225, please use {{cite journal}} with |jstor=1303225 instead.
  6. ^ Attention: This template ({{cite jstor}}) is deprecated. To cite the publication identified by jstor:1638409, please use {{cite journal}} with |jstor=1638409 instead.
  7. ^ Attention: This template ({{cite jstor}}) is deprecated. To cite the publication identified by jstor:1300523, please use {{cite journal}} with |jstor=1300523 instead.
  8. ^ MADSEN, F. J. (1962). "The systematic position of the Middle Cambrian fossil Eldonia" (PDF). Medd. Dan. Geol. Foren. 15: 87–89.
  9. ^ MADSEN, F. J. (1956). "Eldonia, a Cambrian Siphonophore-formerly interpreted as a Holoturian[sic]". Videnskabelige meddelelser fra Dansk naturhistorisk forening i Københaven. 118: 7–14.
  10. ^ Lemche, Henning (1960). "A possible central place for Stenethecoides Resser, 1939 and Cambridium Horny, 1957 (Mollusca Monoplacophora) in invertebrate phylogeny". Rep. Int. Geol. Congr.,. XXI Session, Norden (Pt. 22): 92–101. {{cite journal}}: line feed character in |title= at position 25 (help)CS1 maint: extra punctuation (link)
  11. ^ Jun-yuan, C.; Mao-yan, Z.; Gui-qing, Z.; Signogneau-russell, D.; Hahn, R.; Koz{l}owska-dawidziuk, A.; Stefaniak, K. (1995), "The Early Cambrian medusiform metazoan Eldonia from the Chenjiang Lagerstätte" (PDF), Acta Palaeontologica Polonica, 40 (3): 213–244, retrieved 2009-08-12
  12. ^ Attention: This template ({{cite jstor}}) is deprecated. To cite the publication identified by jstor:2400788, please use {{cite journal}} with |jstor=2400788 instead.
  13. ^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.2110/palo.2006.p06-085r , please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.2110/palo.2006.p06-085r instead.
  14. ^ Caron, J.; Conway Morris, S.; Shu, D.; Soares, D. (2010). Soares, Daphne (ed.). "Tentaculate fossils from the Cambrian of Canada (British Columbia) and China (Yunnan) interpreted as primitive deuterostomes". PLoS ONE. 5 (3): e9586. doi:10.1371/journal.pone.0009586. PMC 2833208. PMID 20221405.{{cite journal}}: CS1 maint: unflagged free DOI (link)
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