NDLI: Early evolution of the family Siderastraeidae (Scleractinia; Cretaceous-extant)

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Early evolution of the family Siderastraeidae (Scleractinia; Cretaceous-extant)

Content Provider	Springer Nature Link
Author	Löser, Hannes
Copyright Year	2016
Abstract	Critical review of Mesozoic and Paleogene fossil type material and morphological comparison with the type genus Siderastrea of the family Siderastraeidae propose that the earliest members of the family date from the Late Valanginian (Early Cretaceous) and gained diversity during the Early Cretaceous. The most common member is the new genus Eosiderastrea, which encompasses all Cretaceous material that was formerly assigned to the extant coral genus Diploastrea. The new genus is characterised by an astreoid, rarely plocoid or cerioid calicular arrangement, and a sub-regular septal symmetry representing hexameral, heptameral, octameral and decameral symmetries. The septal blades are made of medium-large trabeculae. Synapticulae are present. Eighteen Cretaceous species are assigned to the new genus. The genus Eosiderastrea occurs worldwide and ranges from the Late Valanginian to the Santonian. Cretaceous material formerly assigned to Siderofungia is assigned to the new genus Palaeosiderofungia, which is characterised by a thamnasterioid calicular arrangement with calices predominantly arranged in rows and an extended coenosteum. The septal blades are made of medium-large trabeculae; synapticulae are present. There is no septal symmetry. Apart from the type species Thamnasteria exigua, another four unnamed species are known. The new genus occurs only in the Boreal and Central to Western Tethys and ranges from the Aptian to Santonian. The occurrence of the extant Siderastrea in the Cretaceous cannot be ruled out. Isolated finds are reported from the Aptian onwards.Die kritische Durchsicht mesozoischen und paläogenen Typusmaterials und morphologischer Vergleich mit der Gattung Siderastrea der Familie Siderastraeidae zeigt, dass die frühesten Mitglieder der Familie aus dem späten Valanginium (Unterkreide) stammen und die Familie von diesem Zeitpunkt ab an Diversität gewann. Häufigster Vertreter ist die neue Gattung Eosiderastrea, die Material aus der Kreide umfasst, das bisher zur Gattung Diploastrea gestellt wurde. Die neue Gattung ist durch eine astreoide, selten plocoide oder cerioide Kelchanordnung gekennzeichnet, besitzt eine relativ regelmäßige Septalsymmetrie in sechs, sieben, acht oder zehn Systemen. Die Septen sind aus mittelgroßen Trabekeln aufgebaut. Synaptikeln sind vorhanden. Achtzehn Arten werden zu der neuen Gattung gestellt. Die Gattung Eosiderastrea kommt weltweit vor, und reicht vom späten Valanginium bis in das Santonium. Kreidezeitliches Material, das bisher zur Gattung Siderofungia gestellt wurde, wird der neuen Gattung Palaeosiderofungia zugewiesen, die durch eine thamnasterioide Kelchanordnung mit Kelchen, die meist in Reihen angordnet sind, und einem breiten Coenosteum gekennzeichnet ist. Die Septen sind aus mittelgroßen Trabekeln aufgebaut; Synaptikeln sind vorhanden. Es existiert keine Septalsymmetrie. Neben der Typusart Thamnasteria exigua werden vier Arten in offener Nomenklatur vorgestellt. Die Gattung kommt im Boreal und in der zentralen bis westlichen Tethys vor, und reicht vom Aptium bis in das Santonium. Das Vorkommen der rezenten Gattung Siderastrea in der Kreide kann nicht ausgeschlossen werden. Isolierte Funde sind ab dem Aptium bekannt.
Starting Page	1
Ending Page	17
Page Count	17
File Format	PDF
ISSN	00310220
Journal	Paläontologische Zeitschrift
Volume Number	90
Issue Number	1
e-ISSN	18676812
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-02-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Corals Cretaceous Scleractinia New taxa Paleontology
Content Type	Text
Resource Type	Article
Subject	Paleontology

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