Posted by ricardo marcenaro | Posted in Fossils - Fosiles: Araripegomphus andreneli - Cf Abrohemeroscopus sp - Links to more Fossils | Posted on 13:09
Insect Order Odonata, Family Araripegomphidae
Geological Time: Lower Cretaceous, Late Aptian-Cenomanian (108-92 million years ago)
Size (25.4 mm = 1 inch): Dragonfly fossil has 64 mm wingspan, Head-Body length 56 mm, Matrix: 115 mm by 140 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 is a member of the Odonata (dragonflies and damselflies). The Odonata are well-represented in the fossil record, with some 700 species known. They have their origin in the proto-Odonates from the Carboniferous. Meganeuropsis from the Permian of North America, with a 75 cm wingspan, was the largest insect on record. This impressive dragonfly is well-displayed on its large matrix, and is a fine example of this genus named after the Araripe Basin.
Order Odonata, Family Hemeroscopidae
Geological Time: Lower Cretaceous (~128 m.y.a.)
Size (25.4 mm = 1 inch): Dragonfly fossil is 70 mm long with a 110 mm wingspan
Matrix: 120 mm by 125 mm
Fossil Site: Yixian Formation, Shangyuan, Liaoning Province of China
Description: The fossils from Liaoning Province, China are known throughout the world for their exceptional preservation. The dragonfly shown here is an example of that preservational detail. The venation in the wings is most clearly visible, and alone would make this an exceptional specimen. While there are repaired cracks, these are the inevitable consequence of removal of sections of a matrix which has a tendency to fracture easily.
Fossils - Fosiles: Araripegomphus andreneli - Cf Abrohemeroscopus sp - Links to more Fossils
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