First description of scleractinian corals from the Santa Marta and Snow Hill Island (Gamma Member) formations, Upper Cretaceous, James Ross Island, Antarctica

Roberto VIDEIRA-SANTOS; Sandro Marcelo SCHEFFLER; Luiz Carlos WEINSCHÜTZ; Rodrigo Giesta FIGUEIREDO; Taissa RODRIGUES; Juliana Manso SAYÃO; Douglas Santos RIFF

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First description of scleractinian corals from the Santa Marta and Snow Hill Island (Gamma Member) formations, Upper Cretaceous, James Ross Island, Antarctica

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Antarctic corals are known from the Upper Cretaceous Santa Marta Formation(Santonian–early Campanian)and Gamma Member(late Campanian)of Snow Hill Island Formation(late Campanian–early Maastrichtian)but they have not so far been taxonomically described.We describe three corals taxa based on 29 specimens collected in 2007 and 2016 on James Ross Island(northeast of the Antarctic Peninsula).They represent the first formal record of scleractinian corals from the Santa Marta Formation,identified as Caryophylliidae indet.and Gamma Member of Snow Hill Island Formation,identified as Astreopora sp.and Fungiacyathus deltoidophorus.The family Caryophylliidae and the genus Astreopora were not restricted to the Weddellian Biogeographic Province but the species Fungiacyathus deltoidophorus was endemic to Antarctica during the Cretaceous.The genus Fungiacyathus and the family Caryophylliidae thrive in Antarctica until the present day.Fungiacyathus occurred in shallower environments during the late Campanian than today.No specimens related to Astreopora have yet to be found in Antarctica after the late Campanian.This can be explained by the capacity of Fungiacyathus and Caryophyllidae to endure cold waters,since they are asymbiotic corals.The symbiotic Astreopora sp.,due to its sensitivity to low temperatures,became extinct in this continent as soon as the Antarctic waters began to cool,around the Campanian/Maastrichtian.The presence of Astreopora sp.in Gamma Member of Snow Hill Island Formation may represents the first occurrence of this genus in Antarctica and the oldest record of this genus in the Southern Hemisphere.

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《极地科学进展(英文版)》 |2020年第3期|205-214|共10页
作者
Roberto VIDEIRA-SANTOS; Sandro Marcelo SCHEFFLER; Luiz Carlos WEINSCHÜTZ; Rodrigo Giesta FIGUEIREDO; Taissa RODRIGUES; Juliana Manso SAYÃO; Douglas Santos RIFF;
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Laboratório de Paleoinvertebrados Departamento de Geologia e Paleontologia Museu Nacional Universidade Federal do Rio de Janeiro Quinta da Boa Vista s/n 20940-040 Rio de Janeiro RJ Brazil;

Universidade Federal Rural do Rio de Janeiro BR-465 Km 07 s/n 23890-000 Seropédica RJ Brazil;

Laboratório de Paleoinvertebrados Departamento de Geologia e Paleontologia Museu Nacional Universidade Federal do Rio de Janeiro Quinta da Boa Vista s/n 20940-040 Rio de Janeiro RJ Brazil;

Centro Paleontológico de Mafra – CENPALEO Universidade do Contestado Av. Pres. Nereu Ramos 1071 89300-000 Mafra SC Brazil;

Departamento de Biologia Universidade Federal do Espírito Santo – UFES Alto Universitário s/n Guararema Alegre ES Brazil;

Laboratório de Paleontologia Departamento de Ciências Biológicas Centro de Ciências Humanas e Naturais Universidade Federal do Espírito Santo – UFES Avenida Fernando Ferrari 514 Goiabeiras 29075-910 Vitória ES Brazil;

Laboratório de Paleobiologia e Microestruturas Núcleo de Biologia Centro Acadêmico de Vitória Universidade Federal de Pernambuco – UFPE Rua do Alto do Reservatório s/n 52050-480 Vitória de Santo Antão PE Brazil;

Laboratory of Systematics and Taphonomy of Fossil Vertebrates Departamento de Geologia e Paleontologia Museu Nacional/Universidade Federal do Rio de Janeiro Quinta da Boa Vista s/n São Cristóvão 20940-040 Rio de Janeiro RJ Brazil;

Laboratório de Paleontologia Instituto de Biologia Universidade Federal de Uberlandia campus Umuarama 38400-902 Uberlandia MG Brazil;

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First description of scleractinian corals from the Santa Marta and Snow Hill Island (Gamma Member) formations, Upper Cretaceous, James Ross Island, Antarctica

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