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Oppelia Propefusca
''Oppelia'' is a haploceratoid ammonite and type genus for the Oppeliidae that lived during the Middle Jurassic. Shells of ''Oppelia'' are involute with a small to moderate size umbilicus, bluntly rounded to sharp venter, and deeply impressed dorsum. Sides are generally smooth but may be variously ribbed on the outer flanks. Similar and related genera include ''Oxycerites'' and ''Oecotraustes ''Oecotraustes'' is an extinct cephalopod genus included in the ammonid family Oppeliidae Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great varie ...''. Distribution Jurassic of Germany, Greenland, India, Italy, Madagascar, Mexico, Poland, Spain and the United Kingdom References Ammonitida genera Oppeliidae Jurassic ammonites Ammonites of Europe {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aptychus
An aptychus is a type of marine fossil. It is a hard anatomical structure, a sort of curved shelly plate, now understood to be part of the body of an ammonite. Paired aptychi have, on rare occasions, been found at or within the aperture of ammonite shells. The aptychus was usually composed of calcite, whereas the ammonite shell was aragonite. Aptychi can be found well-preserved as fossils, but usually quite separate from ammonite shells. This circumstance led to them being initially classified as valves of bivalves (clams), which they do somewhat resemble. Aptychi are found in rocks from the Devonian period through to those of the Cretaceous period. There are many forms of aptychus, varying in shape and in the sculpture of the inner and outer surfaces. However, because they are so rarely found in position within the ammonite shell, it is often unclear which kind of aptychus belonged to which species of ammonite. When only a single plate is present, as is sometimes the case, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oppelia Mamertensis
''Oppelia'' is a haploceratoid ammonite and type genus for the Oppeliidae that lived during the Middle Jurassic. Shells of ''Oppelia'' are involute with a small to moderate size umbilicus, bluntly rounded to sharp venter, and deeply impressed dorsum. Sides are generally smooth but may be variously ribbed on the outer flanks. Similar and related genera include ''Oxycerites'' and ''Oecotraustes ''Oecotraustes'' is an extinct cephalopod genus included in the ammonid family Oppeliidae Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great varie ...''. Distribution Jurassic of Germany, Greenland, India, Italy, Madagascar, Mexico, Poland, Spain and the United Kingdom References Ammonitida genera Oppeliidae Jurassic ammonites Ammonites of Europe {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oppelia Paronai
''Oppelia'' is a haploceratoid ammonite and type genus for the Oppeliidae that lived during the Middle Jurassic. Shells of ''Oppelia'' are involute with a small to moderate size umbilicus, bluntly rounded to sharp venter, and deeply impressed dorsum. Sides are generally smooth but may be variously ribbed on the outer flanks. Similar and related genera include ''Oxycerites'' and ''Oecotraustes ''Oecotraustes'' is an extinct cephalopod genus included in the ammonid family Oppeliidae Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great varie ...''. Distribution Jurassic of Germany, Greenland, India, Italy, Madagascar, Mexico, Poland, Spain and the United Kingdom References Ammonitida genera Oppeliidae Jurassic ammonites Ammonites of Europe {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oppelia Plicatella
''Oppelia'' is a haploceratoid ammonite and type genus for the Oppeliidae that lived during the Middle Jurassic. Shells of ''Oppelia'' are involute with a small to moderate size umbilicus, bluntly rounded to sharp venter, and deeply impressed dorsum. Sides are generally smooth but may be variously ribbed on the outer flanks. Similar and related genera include ''Oxycerites'' and ''Oecotraustes ''Oecotraustes'' is an extinct cephalopod genus included in the ammonid family Oppeliidae Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great varie ...''. Distribution Jurassic of Germany, Greenland, India, Italy, Madagascar, Mexico, Poland, Spain and the United Kingdom References Ammonitida genera Oppeliidae Jurassic ammonites Ammonites of Europe {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oppelia Propefusca
''Oppelia'' is a haploceratoid ammonite and type genus for the Oppeliidae that lived during the Middle Jurassic. Shells of ''Oppelia'' are involute with a small to moderate size umbilicus, bluntly rounded to sharp venter, and deeply impressed dorsum. Sides are generally smooth but may be variously ribbed on the outer flanks. Similar and related genera include ''Oxycerites'' and ''Oecotraustes ''Oecotraustes'' is an extinct cephalopod genus included in the ammonid family Oppeliidae Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great varie ...''. Distribution Jurassic of Germany, Greenland, India, Italy, Madagascar, Mexico, Poland, Spain and the United Kingdom References Ammonitida genera Oppeliidae Jurassic ammonites Ammonites of Europe {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oppelia Subcostaria
''Oppelia'' is a haploceratoid ammonite and type genus for the Oppeliidae that lived during the Middle Jurassic. Shells of ''Oppelia'' are involute with a small to moderate size umbilicus, bluntly rounded to sharp venter, and deeply impressed dorsum. Sides are generally smooth but may be variously ribbed on the outer flanks. Similar and related genera include ''Oxycerites'' and ''Oecotraustes ''Oecotraustes'' is an extinct cephalopod genus included in the ammonid family Oppeliidae Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great varie ...''. Distribution Jurassic of Germany, Greenland, India, Italy, Madagascar, Mexico, Poland, Spain and the United Kingdom References Ammonitida genera Oppeliidae Jurassic ammonites Ammonites of Europe {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oppelia Yeovilensis
''Oppelia'' is a haploceratoid ammonite and type genus for the Oppeliidae that lived during the Middle Jurassic. Shells of ''Oppelia'' are involute with a small to moderate size umbilicus, bluntly rounded to sharp venter, and deeply impressed dorsum. Sides are generally smooth but may be variously ribbed on the outer flanks. Similar and related genera include ''Oxycerites'' and ''Oecotraustes ''Oecotraustes'' is an extinct cephalopod genus included in the ammonid family Oppeliidae Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great varie ...''. Distribution Jurassic of Germany, Greenland, India, Italy, Madagascar, Mexico, Poland, Spain and the United Kingdom References Ammonitida genera Oppeliidae Jurassic ammonites Ammonites of Europe {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haploceratoidea
Haploceratoidea, formerly Haplocerataceae, is an extinct superfamily of Ammonoidea, ammonoid cephalopods belonging to the Ammonitida that unites three families, Strigoceratidae, Oppeliidae, and Haploceratidae, listed below. Haploceratoidea begins with all three families in the lower Middle Jurassic, Bajocian. Strigoceratidae is limited to the Bajocian but Oppeliidae, and Haploceratidae extend through the remaining Jurassic, well into the Cretaceous; the Oppeliidae into the middle Albian, the Haplocertidae only into the Valanginian. Diagnosis Haploceratoidea are typically compressed, discoidal Ammontida that may be keeled or unkeeled, tending to be oxyconic, with usually falcoid or falcate ribbing. The aptychus, aptychi are paired and differ between families and have been found ''in situ'' in e.g. ''Oppelia, Oppelia subrudiata'' and in ''Pseudolissoceras''. Taxonomy The Origin of the Haploceratoidea is undetermined but it is likely all three component families have their beginni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oppeliidae
Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great variety, but ribbing usually more or less falcoid or falcate. The Oppeliidae is the principal family of the Haploceratoidea, with the longest duration, extending from the Middle Jurassic (Bajocian) to the Upper Cretaceous (Cenomanian) Their derivation is from the Hildoceratoidea. Subfamilies Nine subfamilies are recognized, the first eight of which are included in the earlier Treatise, Part L. They are the: :Oppeliinae :Hecticoceratinae :Distchoceratinae :Teramelliceratinae :Phlycticeratinae :Streblitinae :Mazapilitinae :Aconeceratinae :Binneyitinae The Binneyitinae was added by Donovan ''et al'', 1981, transferred from the Stephanoceratoidea. References * D.T Donavan, J.H. Callomon, and M.K Howarth. 1981. Classification of the Jurassic Ammonitina. In The Ammonoidea. M.R. House and J.R. Senior, eds. Systematics Assoc. Pub Acad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle Jurassic
The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from about 174.1 to 163.5 million years ago. Fossils of land-dwelling animals, such as dinosaurs, from the Middle Jurassic are relatively rare, but geological formations containing land animal fossils include the Forest Marble Formation in England, the Kilmaluag Formation in Scotland,British Geological Survey. 2011Stratigraphic framework for the Middle Jurassic strata of Great Britain and the adjoining continental shelf: research report RR/11/06 British Geological Survey, Keyworth, Nottingham. the Daohugou Beds in China, the Itat Formation in Russia, and the Isalo III Formation of western Madagascar. Paleogeography During the Middle Jurassic Epoch, Pangaea began to separate into Laurasia and Gondwana, and the Atlantic Ocean formed. Eastern Laurasia was tectonically active as the Cimmerian plate continued to collide with Laurasia's southern coast, completely closing the Paleo-Tethys Ocean. A subduction zone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxycerites
''Oxycerites'' is an extinct ammonoid cephalopod belonging to the haploceratoid family, Oppeliidae Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great variety, but ribbing usually more or less falcoid or falcate. The Oppeliidae is the principal famil ..., that lived during the Middle Jurassic. Shells of ''Oxycerites'' are involute, compressed and generally smooth with a sharply rounded venter on the outer rim, deeply impressed dorsum on the inner rim, and a small umbilicus. The living chamber takes up slightly more than half a whorl. ''Oxycerites'' grew to a diameter of at least 17.5 cm, about 7 inches. '' Oppelia'' and '' Oecotraustes'' are similar and closely related forms. ''Oppelia'' is smoother, ''Oecotraustes'' more strongly ribbed Distribution Jurassic of Argentina, France, Germany, Iran, Madagascar, Russia, Saudi Arabia and the United Kingdom References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oecotraustes
''Oecotraustes'' is an extinct cephalopod genus included in the ammonid family Oppeliidae Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great variety, but ribbing usually more or less falcoid or falcate. The Oppeliidae is the principal famil ... and named by Waagen in 1869. The genus lived during the Middle Jurassic. Description The shell of ''Oecotraustes'' is evolute, the outer whorl only moderately embracing the inner whorls, laterally compressed whorl height greater than width. Outer flanks and venter ribbed, ribs sinuous. Distribution Fossils of ''Oecotraustes'' species have been found in Jurassic sediments of Germany, India, Madagascar, Spain, and the United States. References *W.J. Arkell ''et al.'', 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geological Society of America. Jurassic ammonites Ammonites of Europe Ammonites of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
