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Haplocerataceae
Haploceratoidea, formerly Haplocerataceae, is an extinct superfamily of 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 aptychi are paired and differ between families and have been found ''in situ'' in e.g. '' Oppelia subrudiata'' and in '' Pseudolissoceras''. Taxonomy The Origin of the Haploceratoidea is undetermined but it is likely all three component families have their beginnings in the Hammatoceratidae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonoidea
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) than they are to shelled nautiloids such as the living ''Nautilus'' species. The earliest ammonites appeared during the Devonian, with the last species vanishing during the Cretaceous–Paleogene extinction event. Ammonites are excellent index fossils, and linking the rock layer in which a particular species or genus is found to specific geologic time periods is often possible. Their fossil shells usually take the form of planispirals, although some helically spiraled and nonspiraled forms (known as heteromorphs) have been found. The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder ( 79 AD nea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neolissoceras
''Neolissoceras'' is a genus of haploceratid ammonites with a smooth, compressed, flat-sided shell with a flatly rounded venter and distinct umbilical margin, from the Upper Jurassic (Tithonian) - Lower Cretaceous (Hauterivian The Hauterivian is, in the geologic timescale, an age in the Early Cretaceous Epoch or a stage in the Lower Cretaceous Series. It spans the time between 132.9 ± 2 Ma and 129.4 ± 1.5 Ma (million years ago). The Hauterivian is preceded by the Va ...) of southern Europe, Madagascar, and India.Paleobiology Database - Neolissoceras 2017-10-19. References * Arkell ''et al.'', 1957 Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L. Geol Society of America and Univ Kansas Press R.C Moore (ed)[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Streblitinae
Streblitinae is a subfamily of Upper Jurassic and Lower Cretaceous ammonites within the 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 ... characterized by compressed, involute shells; typically oxycones with complex sutures. Includes '' Streblites'', '' Pseudoppelia'', and '' Substreblites''. Derivation is from the Taramelliceratinae. May have given rise to the Aconiceratinade. References W.J. Arkell ''et al.'', 1957 Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas Press. D.T. Donovan, J.H. Callomon, and M.K. Howarth, 1981. Classification of the Jurassic Ammonitina. The Systematics Association Special Volume no. 18. The Ammonoidea. Academic Press. Oppeliidae Late Jurassic first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oppeliinae
Oppeliinae is a subfamily within the Oppeliidae, a family of Jurassic ammonites characterized by forms that are mainly oxyconic, compressed with sharp venters, in the adult and with keeled inner whorls. Sutures are complex, consisting of a long series of evenly graded lobes and saddles with finely frilled endings.Treatise on Invertebrate Paleontology Part L ''L274'',(Ammonoidea) The Oppeliinae gave rise to the Hecticoceratinae in the early Bathonian stage, near the middle of their range and to the Taramelliceratinae, in the late Callovian, near the end of their tange, which in turn gave rise to the Streblitinae in the early Kimmeridgian and to the Haploceratidae in the late Kimmeridgian.Classification of Jurassic Ammonitina, D.T. Donovan, ''et al.'' Systematics Assoc no 18 Distribution is worldwide, from the Middle Jurassic, except for Boreal regions. List of genera The Oppeliinae includes the following genera, listed in order of appearance. :'' Bradfordia'' :''Oppelia'' :''O ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mazapilitinae
Mazapilitinae is a subfamily of Upper Jurassic ammonites included in the Oppeliidae. Shells are involute; venter rounded or gently tabulate; ribbing coarse, fold-like, branching.W.J. Arkell ''et al.'', 1957 Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas Press. Genera include '' Mazapilites'', '' Submazapilites'', and '' Eurynoticeras'', which have been found in Kimmeridgian In the geologic timescale, the Kimmeridgian is an age in the Late Jurassic Epoch and a stage in the Upper Jurassic Series. It spans the time between 157.3 ± 1.0 Ma and 152.1 ± 0.9 Ma (million years ago). The Kimmeridgian follows the Oxfordian ... age marine sediments in southern Europe and Mexico. References Oppeliidae Jurassic ammonites Kimmeridgian first appearances Late Jurassic extinctions {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hecticoceras
''Hecticoceras'' is an ammonite genus belonging to the haploceratoid family Oppeliidae, that lived during the Middle and Late Jurassic, from the Callovian. ''Hecticoceras'' may be seen as a series of some nine subgenera, beginning with the lower Callovian ''H. (Hecticoceras)'' and ''H. (Hecticoceratoides)'' and ending with the lower Oxfordian ''H. (Pseudobrightia)'' and ''H. (Eochetoceras)''. ''Hecticoceras'' ''sensu lato'' and ''Prohecticoceras'' from the underlying Bathonian In the geologic timescale the Bathonian is an age and stage of the Middle Jurassic. It lasted from approximately 168.3 Ma to around 166.1 Ma (million years ago). The Bathonian Age succeeds the Bajocian Age and precedes the Callovian Age. Strat ... form the oppeliid subfamily, Hecticoceratinae. ''Hecticoceras'', including its various subgenera, have a widespread distribution and have been found in the late Middle and early Upper Jurassic of Europe, North Africa, Somalia, India, Madagascar, and possib ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hecticoceratinae
Hecticoceratinae is a subfamily of oppeliids from the Middle and Upper Jurassic typically with strong falcoid or falcate ribbing that covers whorl sides completely. Venters are usually keeled and may be tricarinate.Treatise on Invertebrate Paleontology Part L, ''L276'' (Ammonoidea) The Hecticocerainae, which has its origin in the Oppeliinae, give rise to the Distichoceratinae near the beginning of the Middle Jurassic Callovian, and to the Glochiceratinae early in the Upper Jurassic Oxfordian.Classification of Jurassic Ammonitina, D.T. Donovan, et al., Systematics Assoc., 1981 Neither apparently gave rise to any subsequent groups. Genera ''Hecticoceras'', ''Brightia'', ''Eochetoceras'', ''Hecticoceratoides'', ''Lunuloceras'', ''Kheraites'', ''Proheticoceras'', ''Pseudobrightia'', and ''Pseudobrightia'', listed as separate genera in the Treatise are regarded as subgenera of ''Hecticoceras ''Hecticoceras'' is an ammonite genus belonging to the haploceratoid family Oppeliid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
