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Microconchid
The order Microconchida is a group of small, spirally-coiled, encrusting fossil "worm" tubes from the class Tentaculita found from the Upper Ordovician to the Middle Jurassic (Bathonian) around the world. They have lamellar calcitic shells, usually with pseudopunctae or punctae and a bulb-like origin. Many were long misidentified as the polychaete annelid ''Spirorbis'' until studies of shell microstructure and formation showed significant differences. All pre-Cretaceous "''Spirorbis''" fossils are now known to be microconchids. Their classification at the phylum level is still debated. Most likely they are some form of lophophorate, a group which includes phoronids, bryozoans and brachiopods. Microconchids may be closely related to the other encrusting tentaculitoid tubeworms, such as ''Anticalyptraea'', trypanoporids and cornulitids. References * Wilson, M.A., Yancey, T.E. and Vinn, O. 2011. "A new microconchid tubeworm from the Lower Permian (Artinskian) of central Texas, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jurassic
The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of the Mesozoic, Mesozoic Era and is named after the Jura Mountains, where limestone strata from the period were first identified. The start of the Jurassic was marked by the major Triassic–Jurassic extinction event, associated with the eruption of the Central Atlantic magmatic province, Central Atlantic Magmatic Province. The beginning of the Toarcian Stage started around 183 million years ago and is marked by an extinction event associated with widespread Anoxic event, oceanic anoxia, ocean acidification, and elevated temperatures likely caused by the eruption of the Karoo-Ferrar, Karoo-Ferrar large igneous provinces. The end of the Jurassic, however, has no clear boundary with the Cretaceous and i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Punctaconchus
''Punctaconchus'' is a genus of microconchid tubeworms. It was the last genus of microconchids, and the only genus to exist beyond the Triassic. Their tubes have large pores (punctae) penetrating the tube wall. Tubes lumen is covered by ripplemark−like transverse ridges. ''Punctaconchus'' occurs in the Middle Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ... of England, France and Poland. References {{Taxonbar, from=Q7260018 Protostome enigmatic taxa Tentaculita Jurassic invertebrates Jurassic animals of Europe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trypanoporida
Trypanoporida is an extinct order of encrusting animals within Class Tentaculita, which were common in Devonian oceans (Weedon, 1991). Their affinity is unknown; they have been placed among worms and corals. They appear to be closely related to other taxa of uncertain affinity, including the microconchids, cornulitids, and tentaculitids. Spirally coiled trypanoporids (Devonian) were most likely derived from the geologically older microconchids (Late Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start ...). References * Weedon, M.J. 1991. Microstructure and affinity of the enigmatic Devonian tubular fossil ''Trypanopora''. Lethaia 24:227-234. Tentaculita Devonian animals Late Devonian animals Devonian first appearances Devonian extinctions {{devonian-animal-stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicoconchus Elongatus
''Helicoconchus'' is a microconchid genus that occurs in the Lower Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleoz ... of Texas. It forms small reef-like bodies of tubes branching from a common origin. The impunctate tubes are greatly elongated for microconchids and have occasional diaphragms with central pits. The tubes branch in two ways: budding from the tube wall and binary fission. They lived in shallow, normal marine environments. References Protostome enigmatic taxa Tentaculita Permian animals of North America {{permian-animal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornulitida
Cornulitida is an extinct order of encrusting animals from class Tentaculita, which were common around the globe in the Ordovician to Devonian oceans, and survived until the Carboniferous. The organisms had shells, and were subject to predation by boring and other means from the Ordovician onwards. Many survived attacks by predators. Several cornulitids were endobiotic symbionts in the stromatoporoids and tabulates. Their affinity is unknown; they have been placed in many phyla, and have been considered worms, corals, molluscs and more. They appear to be closely related to other taxa of uncertain affinity, including the microconchids, trypanoporids and tentaculitid Tentaculita is an extinct class of uncertain placement ranging from the Early Ordovician to the Middle Jurassic. They were suspension feeders with a near worldwide distribution. For a more thorough discussion, see ''Tentaculites''. The presenc ...s. References {{Taxonbar, from=Q5171922 Tentaculita M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tentaculita
Tentaculita is an extinct class of uncertain placement ranging from the Early Ordovician to the Middle Jurassic. They were suspension feeders with a near worldwide distribution. For a more thorough discussion, see ''Tentaculites''. The presence of perforate septa and "septal necks" has been used to argue for a cephalopod affinity, whereas the shell microstructure, notably the presence of punctae, points to a brachiopod relationship. Subdivisions ; Subclasses *Chonioconarida ;Orders * Cornulitida * Microconchida * Tentaculitida * Trypanoporida ;Genera *''Anticalyptraea ''Anticalyptraea'' is a fossil genus of encrusting tentaculitoid tubeworms from the Silurian to Devonian of Europe and North America (Vinn, 2010). ''Anticalyptraea'' commonly encrust various invertebrate fossils such as stromatoporoids, rugose ...'' References * Farsan, N. M. (1994). Tentaculiten: Ontogenese, Systematik, Phylogenese, Biostratonomie und Morphologie. ''Abhandlungen der Senckenbergischen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anticalyptraea
''Anticalyptraea'' is a fossil genus of encrusting tentaculitoid tubeworms from the Silurian to Devonian of Europe and North America (Vinn, 2010). ''Anticalyptraea'' commonly encrust various invertebrate fossils such as stromatoporoids, rugose corals, bryozoans, brachiopods and crinoids, but they can also be common on the hardgrounds. They were often attacked by predators in the Pridoli of Baltica. ''Anticalyptraea'' was traditionally interpreted as a phorid gastropod, but was later assigned to the Class Tentaculita. Its dextrally coiled substrate-cemented tube, bulbous initial chamber, vesicular tube wall and pseudopunctate microlamellar shell structure closely resembles trypanoporids (Tentaculita), but ''Anticalyptraea'' differs in having the cones of the pseudopunctae oriented in the opposite direction. Pseudopunctae oriented similarly to ''Anticalyptraea'' occur in ''Cornulites'' (cornulitids) and thick-walled tentaculitids. The name ''Anticalyptraea'' is a reference to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spirorbis
''Spirorbis'' is a genus of very small () polychaete worms, usually with a white coiled shell. Members of the genus live in the lower littoral and sublittoral zones of rocky shores. ''Spirorbis'' worms usually live attached to seaweeds, but some species live directly on rocks, shells or other hard substrates. ''Spirorbis'' was once thought to have a fossil record extending back into the Early Paleozoic, but now all pre-Cretaceous spirorbins are known to be microconchids. The earliest members of genus appeared in the Miocene, but Oligocene finds may also be possible. The genus contains the following species: * ''Spirorbis borealis'' Daudin, 1800 * '' Spirorbis corallinae'' De Silva and Knight-jones, 1962 * '' Spirorbis cuneatus'' Gee, 1964 * '' Spirorbis granulatus'' * '' Spirorbis incongruus'' * ''Spirorbis inornatus'' L'hardy and Quievreux, 1962 * '' Spirorbis knightjonesi'' Desilva, 1965 * '' Spirorbis lineatus'' * '' Spirorbis marioni'' (Caullery and Mesnil, 1897) * ''Spirorbis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicoconchus
''Helicoconchus'' is a microconchid genus that occurs in the Lower Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleoz ... of Texas. It forms small reef-like bodies of tubes branching from a common origin. The impunctate tubes are greatly elongated for microconchids and have occasional diaphragms with central pits. The tubes branch in two ways: budding from the tube wall and binary fission. They lived in shallow, normal marine environments. References Protostome enigmatic taxa Tentaculita Permian animals of North America {{permian-animal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annuliconchus
''Annuliconchus'' is a genus of microconchid tubeworms. Their tubes have pseudopunctae penetrating the tube wall. Tubes lumen is annulated. ''Annuliconchus'' occurs in the Silurian The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleozo ... of Baltica. References {{Taxonbar, from=Q4769735 Protostome enigmatic taxa Tentaculita Silurian animals Prehistoric life of Europe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palaeoconchus
''Palaeoconchus'' is a genus of microconchid tubeworms. Their tubes have pseudopunctae penetrating the tube wall. Tubes lumen is smooth. ''Palaeoconchus'' occurs in the Late Ordovician of Baltica and Avalonia. In the Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ... it had a global distribution. References {{Taxonbar, from=Q16987152 Protostome enigmatic taxa Tentaculita Ordovician invertebrates Silurian animals Devonian animals Late Devonian animals Devonian animals of Europe Late Ordovician first appearances Devonian extinctions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Paleontology
The ''Journal of Paleontology'' is a peer-reviewed scientific journal covering the field of paleontology. It is published by the Paleontological Society. Indexing The ''Journal of Paleontology'' is indexed in: *BIOSIS Previews *Science Citation Index *The Zoological Record *GeoRef __NOTOC__ The GeoRef database is a bibliographic database that indexes scientific literature in the geosciences, including geology. Coverage ranges from 1666 to the present for North American literature, and 1933 to the present for the rest of t ... References Paleontology journals Publications established in 1927 Academic journals published by learned and professional societies Cambridge University Press academic journals Bimonthly journals Paleontological Society {{paleo-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
