Posted by ricardo marcenaro | Posted in Fossils - Fosiles: Insects - Cf Cretereisma antiqua - Acanthosomatidae - Links to more Fossils | Posted on 10:32
Cf Cretereisma antiqua
Class Insecta, Order Ephemeroptera
Geological Time: Lower Cretaceous, Late Aptian-Cenomanian (108-92 million years ago)
Size (25.4 mm = 1 inch):Insect fossil body: 13 mm; Forewings: 17 mm; Hindwings: 14 mm; Matrix: 95 mm by 105 mm.
Fossil Site: Crato Formation, Nova Olinda Member, Ceara, Brazil
Description: The Araripe Basin of Brazil is home to a fantastic array of exquisitely-detailed Early Cretaceous fossils, some of which have been preserved in three dimensions. While the entire formation has until the last decade or so been termed the Santana Formation, David Martill has separated out the slightly older insect-bearing strata as the Nova Olinda Member of the Crato Formation. Quarrying operations for the purposes of obtaining paving stones exposes the remarkable insect fauna in much the same way that quarrying for lithographic limestone in Solnhofen has afforded a panoply of wonderfully-preserved Jurassic fossils in Germany. In addition to the many orders of insects, spiders, scorpions, decapod crustaceans, and many plants have been found. Interestingly, to date no pterosaurs or terrestrial vertebrates have been found, in stark contrast to the overlying Santana Formation deposits. This specimen belongs to a genus named just last year as a basal member of the Ephemeroptera, or mayflies. It possesses several archaic features that were thought to have been lost when Protereisma became extinct in the Permian. Less than a handful or specimens are known to science, and this one with all the wings splayed looks for all the world to have been taken from the pinning board of a collector. It is a most unique example of the taxon, and the first I have ever seen.
Acanthosomatidae (shield or stink bug)
Insecta, Order Hemiptera, Family Acanthosomatidae
Geological Time: Late Jurassic/ Early Cretaceous
Size (25.4 mm = 1 inch): Insect fossil is 11 mm by 6 mm. Matrix: 60 mm by 40 mm
Fossil Site: Yixian Formation, Huangbangi Valley, Beipiao, Liaoning Province of China
Description: The Class Insecta is well represented in Liaoning and Hebei Provinces of China, with over 500 species referable to over 100 families based upon over 10,000 specimens. This fantastic diversity and exquisite detail is unprecedented throughout the world. The exact age of the Yixian Formation is still under debate, with some researchers favoring the Early Cretaceous, some the Late Jurassic, and still others the Jurassic/Cretaceous boundary. This example is a fine member of the Acanthosomatidae, a family of shield bugs. In addition to their armor like bodies, many modern day examples exude a foul stench as a defense mechanism, earning them the name “stink bugs”. Note the excellent preservation of the color pattern on the body of this fine specimen.
You have an alphabetical guide in the foot of the page in the blog: solitary dog sculptor
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En el blog: Solitary Dog Sculptor I, la guia alfabética está en el costado derecho de la página
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