The Early Cambrian medusiform metazoan Eldonia from the Chengjiang Lagerstatte

• Autorzy: Jun-Juan C , Mao-Yan Z , Gui-Qing Z
• Języki publikacji: EN

Abstrakty

EN

The alleged Chengjiang scyphozoans Stellostomites eumorphus and Yunnanomedusa eleganta are conspecific. Because of the strong resemblance to the Burgess Shale type species of Eldonia, the Chinese species is relocated to this genus. Eldonia, originally described as a holothurian, on anatomical grounds may as well be interpreted as a lophophorate. The superficial resemblance to jelly-fish is apparently a result of adaptation to pelagic life. Although the extant lophophorates are without exception sedentary, their pelagic relatives were probably abundant in the Early Paleozoic.

PL

W sławnym stanowisku Chengjiang w południowych Chinach, gdzie wczesnokambryjskie zwierzęta zachowane są wraz z wewnętrznymi organami, najpospolitszymi skamieniałościami są kapeluszowate formy opisane niegdyś pod nazwami Stellostomites eumorphus Sun & Hou 1987 i Yunnanomedusa eleganta Sun & Hou 1987. Zgromadzony przez autorów materiał ośmiuset okazów dowodzi, że w istocie jest to jeden gatunek, pokrewny Eldonia ludwigi Walcott 1911 ze środkowego kambru Kolumbii Brytyjskiej, określony więc nazwą Eldonia eumorpha (Sun & Hou 1987). U-kształtne jelito, dwudzielny aparat czułkowy przy otworze gębowym i złożony system kanałów płaszczowych potwierdzają przynależność Eldonia do typu czułkowców Lophophorata, w którym wraz z Rotadiscus i świętokrzyską Velumbrella tworzy gromadę Eldonioidea.

Słowa kluczowe

PL

budowa anatomiczna; Yunnanomedusa eleganta; kambr; Stellostomites eumorphus; skamienialosci; budowa mikrostrukturalna; Chiny; Eldonia; paleontologia; Chengjiang; paleozoologia

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 1995
• Tom: 40
• Numer: 3
• Opis fizyczny: s.213-244,tabl.,rys.,bibliogr.

Twórcy

autor

Jun-Juan C

• Nanjing lnstitute of Geology and Palaeontology, Academia Sinica, Chi-Ming-Ssu, Nanjing, 210008, People's Republic of China

autor

Mao-Yan Z

• Nanjing lnstitute of Geology and Palaeontology, Academia Sinica, Chi-Ming-Ssu, Nanjing, 210008, People's Republic of China

autor

Gui-Qing Z

• Nanjing lnstitute of Geology and Palaeontology, Academia Sinica, Chi-Ming-Ssu, Nanjing, 210008, People's Republic of China

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