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Aculifera
Aculifera is a proposed clade of molluscs incorporating those groups that have no conch or shell, that is, the Polyplacophora, Caudofoveata (= Chaetodermomorpha) and Solenogastres (= Neomeniomorpha). For a summary, see It is sister to the Conchifera. The oldest known aculiferan is '' Qaleruaqia'', which was found in the Aftenstjernesø Formation in Greenland Greenland ( kl, Kalaallit Nunaat, ; da, Grønland, ) is an island country in North America that is part of the Kingdom of Denmark. It is located between the Arctic and Atlantic oceans, east of the Canadian Arctic Archipelago. Greenland i ..., which dates back to the Cambrian Stage 4. References Mollusc taxonomy {{mollusc-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aplacophora
Aplacophora is a presumably paraphyletic taxon. This is a class of small, deep-water, exclusively benthic, marine molluscs found in all oceans of the world. MolluscaBase eds. (2021). MolluscaBase. Aplacophora. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=411 on 2021-04-13 All known modern forms are shell-less: only some extinct primitive forms possessed valves. The group comprises the two clades Solenogastres (Neomeniomorpha) and Caudofoveata (Chaetodermomorpha), which between them contain 28 families and about 320 species. The aplacophorans are traditionally considered ancestral to the other mollusc classes. However, the relationship between the two aplacophoran groups and to the other molluscan classes and to each other is as yet unclear. Aplacophorans are cylindrical and worm-like in form, and most very small, being no longer than ; some species, however, can reach a length of . Habitat Caudofoveates generall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conchifera
Conchifera is a subphylum of the phylum Mollusca. It comprises all of the shell-bearing classes of molluscs, such as clams, tusk shells, ammonites, and monoplacophorans. The other subphylum is Aculifera. Non-monoplacophoran conchiferans emerged within the once-widespread Monoplacophora. The only descendant which retains its ancestral shape is the Tryblidiida. This taxonomic term is used mostly by paleontologists, and not by scientists who study the living molluscs. Classes Classes within the Conchifera include: * Monoplacophora * Bivalvia * Gastropoda * Scaphopoda * Cephalopoda * Archinacelloidea† * Rostroconchia† * Helcionelloida Helcionelloida is an extinct group of ancient molluscs (phylum Mollusca). These are the oldest known conchiferan molluscs, that is, they had a mineralised shell. Some members of this class were mistaken for Monoplacophorans. The class was ...† See also * Evolution of Mollusca References External links BioLib info {{Authority c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epimenia
''Epimenia'' is a genus of cavibelonian solenogasters, a kind of shell-less, worm-like mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...s. MolluscaBase eds. (2021). MolluscaBase. Epimenia Nierstrasz, 1908. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=298341 on 2021-04-15 During the development of species in this genus, the sclerites start out as solid tips, then a hollow stalk develops that is subsequently infilled. Species * '' Epimenia allohaemata'' Salvini-Plawen, 1997 * '' Epimenia arabica'' Salvini-Plawen & Benayahu, 1991 * '' Epimenia australis'' (Thiele, 1897) * '' Epimenia babai'' Salvini-Plawen, 1997 * '' Epimenia indica'' Salvini-Plawen, 1978 * '' Epimenia ohshimai'' Baba, 1940 ;Species brought i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mattheviidae
Mattheviidae is an extinct taxonomic family of fossil chitons, marine polyplacophoran mollusks that are found in Cambrian-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 ... deposits. References Chitons Cambrian molluscs Cambrian first appearances Cambrian extinctions {{chiton-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clade
A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, the equivalent Latin term ''cladus'' (plural ''cladi'') is often used in taxonomical literature. The common ancestor may be an individual, a population, or a species (extinct or extant). Clades are nested, one in another, as each branch in turn splits into smaller branches. These splits reflect evolutionary history as populations diverged and evolved independently. Clades are termed monophyletic (Greek: "one clan") groups. Over the last few decades, the cladistic approach has revolutionized biological classification and revealed surprising evolutionary relationships among organisms. Increasingly, taxonomists try to avoid naming taxa that are not clades; that is, taxa that are not monophyletic. Some of the relationships between organisms ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caudofoveata
Caudofoveata is a small class within the phylum Mollusca, also known as Chaetodermomorpha. The class is often combined with Solenogastres and termed Aplacophora, but some studies have cast doubt on the monophyly of this group. Anatomy Caudofoveata are small (1–30 mm), mainly deep sea molluscs. They are worm-like, lacking shells or distinct muscular feet; they instead have scales and calcareous spines called sclerites, for movement. Ecology Caudofoveates live by burrowing through soft sediment, and feed by lying vertically in the sediment with just the mouthparts exposed and taking in passing organic detritus. During sexual reproduction, the female produces eggs which are fertilized and brooded, and then the larvae swim freely. Diet Caudofoveates feed on foraminifera Foraminifera (; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of amoeboid protists characterized by streaming granular ectoplasm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chaetodermomorpha
Caudofoveata is a small class within the phylum Mollusca, also known as Chaetodermomorpha. The class is often combined with Solenogastres and termed Aplacophora, but some studies have cast doubt on the monophyly of this group. Anatomy Caudofoveata are small (1–30 mm), mainly deep sea molluscs. They are worm-like, lacking shells or distinct muscular feet; they instead have scales and calcareous spines called sclerites, for movement. Ecology Caudofoveates live by burrowing through soft sediment, and feed by lying vertically in the sediment with just the mouthparts exposed and taking in passing organic detritus. During sexual reproduction, the female produces eggs which are fertilized and brooded, and then the larvae swim freely. Diet Caudofoveates feed on foraminifera. Taxonomy Caudofoveata comprises the following families and genera: * Chaetodermatidae ** ''Caudofoveatus'' ** '' Chaetoderma'' * Falcidentidae ** '' Chaetoderma'' ** ''Falcidens'' ** '' Furcillidens'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solenogastres
The Solenogastres (less often referred to as Neomeniomorpha), common name the solenogasters, are one class of small, worm-like, shell-less molluscs (Aplacophora), the other class being the Caudofoveata ( Chaetodermomorpha). MolluscaBase eds. (2021). MolluscaBase. Solenogastres. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=2094 on 2021-04-14 Some recent literature, and recent molecular evidence, indicates that the Aplacophora may be polyphyletic, and therefore these taxonomists divide Solenogastres and Caudofoveata into separate classes. Morphology In contrast to all other molluscan classes, the Aplacophora have no shell, and are instead covered by aragonitic sclerites (calcareous spicules), which can be solid or hollow. These spicules can be arranged perpendicular to one another within the cuticle to form a skeleton, or can stick up to form a palisade, or can lie flat against the cuticle. 80% of solenogaster specie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neomeniomorpha
The Solenogastres (less often referred to as Neomeniomorpha), common name the solenogasters, are one class of small, worm-like, shell-less molluscs (Aplacophora), the other class being the Caudofoveata ( Chaetodermomorpha). MolluscaBase eds. (2021). MolluscaBase. Solenogastres. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=2094 on 2021-04-14 Some recent literature, and recent molecular evidence, indicates that the Aplacophora may be polyphyletic, and therefore these taxonomists divide Solenogastres and Caudofoveata into separate classes. Morphology In contrast to all other molluscan classes, the Aplacophora have no shell, and are instead covered by aragonitic sclerites (calcareous spicules), which can be solid or hollow. These spicules can be arranged perpendicular to one another within the cuticle to form a skeleton, or can stick up to form a palisade, or can lie flat against the cuticle. 80% of solenogaster spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Qaleruaqia
''Qaleruaqia'', known only from the Aftenstjernesø Formation, Lauge Koch Land, North Greenland is considered the earliest fossil aculifera Aculifera is a proposed clade of molluscs incorporating those groups that have no conch or shell, that is, the Polyplacophora, Caudofoveata (= Chaetodermomorpha) and Solenogastres (= Neomeniomorpha). For a summary, see It is sister to the Con ...n. The type species, ''Q. sodermanorum'', was named and described in 2020. References {{Reflist Chitons Cambrian molluscs Fossil taxa described in 2020 Cambrian genus extinctions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aftenstjernesø Formation
The Aftenstjernesø Formation is a geologic formation in Greenland. It preserves fossils dating back to the Cambrian period. See also * List of fossiliferous stratigraphic units in Greenland This is a list of fossiliferous stratigraphic units in Greenland. List of fossiliferous stratigraphic units See also * List of fossiliferous stratigraphic units in Antarctica * Lists of fossiliferous stratigraphic units in North America * ... References * Cambrian Greenland Cambrian southern paleotemperate deposits Cambrian southern paleotropical deposits {{Cambrian-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
