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Akritogyra
''Akritogyra'' is a genus of sea snails, marine gastropod mollusks, unassigned in the superfamily Seguenzioidea Seguenzioidea is a superfamily of minute to medium-sized sea snails, marine gastropod mollusks in the clade Vetigastropoda.Gofas, S. (2010). Seguenzioidea. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Access .... Species Species within the genus ''Akritogyra'' include: * '' Akritogyra conspicua'' (Monterosato, 1880) * '' Akritogyra crenulata'' D. G. Herbert, 2024 * '' Akritogyra curvilineata'' Warén, 1992 * '' Akritogyra helicella'' Warén, 1993 * '' Akritogyra similis'' (Jeffreys, 1883) References External links * * * Gastropod genera {{Seguenzioidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akritogyra Similis
''Akritogyra similis'' is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea. Description The shell grows to a height of 2.2 mm. (Original description) The shell is orbicular and compressed both above and below. It is rather thin, opaque, and glossy. It lacks any sculpture and is whitish in color. The spire is significantly depressed, with 4½ whorls that are rounded and convex. The body whorl occupies approximately half of the shell. The first whorl is spiraled. The suture is wide and deep. The aperture is nearly circular but slightly truncate on the inner side, with thin edges. The umbilicus is open and deep, exposing part of the penultimate whorl. Distribution ''Akritogyra similis'' is found in European waters, specifically the North Atlantic Ocean and the Mediterranean Sea The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akritogyra Conspicua
''Akritogyra conspicua'' is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea. Description The size of the shell varies between 1.3 mm and 2 mm; average diameter 1.4 mm. (Original description in Italian by Monterosato) This species is similar in shape and size to ''Cyclostrema basistriatum'' Jeffreys, 1877 (synonym of ''Skenea basistriata'' (Jeffreys, 1877) ) which is Norwegian, but the shell is completely smooth instead of striated and with deeper suture. Distribution This species occurs in deep waters in Central and Western Mediterranean Sea The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western and Southern Europe and Anatolia, on the south by North Africa, and on the ..., at depths between 100 m and 2400 m. References * External links * * * {{DEFAULTSORT:Akritogyra Conspicua conspicua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akritogyra Curvilineata
''Akritogyra curvilineata'' is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea. Description The size of the shell varies between 1.3 mm and 2.5 mm. Distribution This species occurs in the Atlantic Ocean between Iceland Iceland ( is, Ísland; ) is a Nordic island country in the North Atlantic Ocean and in the Arctic Ocean. Iceland is the most sparsely populated country in Europe. Iceland's capital and largest city is Reykjavík, which (along with its ... and Southern Spain. References External links * * curvilineata Gastropods described in 1992 {{Seguenzioidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akritogyra Crenulata
''Akritogyra crenulata'' is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea. Description The height of the shell attains 0.85 mm, its diameter 1.05 mm. The translucent, milky-white shell is very small and turbiniform, slightly wider than high. The whorls are evenly rounded, with the base umbilicate. The teleoconch contains up to 2.25 whorls. The subsutural region is crenulated by short, broad riblets, with intervals between riblets bearing close-set, microscopic spiral threads. The riblets are much weaker towards the periphery. The microsculpture consists of numerous close-set microscopic axial threads. The riblets reappear on the base, crenulating the umbilical margin. The aperture is circular. The peristome is complete, circular, and slightly disjunct. The outer lip is simple. The interior lacks nacreous coating. The umbilicus is of moderate width. Distribution This species occurs at a depth of 573–582 m on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akritogyra Helicella
''Akritogyra helicella'' is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea. Distribution This species occurs in the Atlantic Ocean off Iceland. References * External links * helicella ''Helicella'' is a genus of small to medium-sized, air-breathing land snails, terrestrial pulmonate gastropod mollusks in the subfamily Helicellinae of the family Geomitridae, the hairy snails and their allies. MolluscaBase eds. (2021). Mollu ... Gastropods described in 1993 {{Seguenzioidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seguenzioidea
Seguenzioidea is a superfamily of minute to medium-sized sea snails, marine gastropod mollusks in the clade Vetigastropoda.Gofas, S. (2010). Seguenzioidea. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=224565 on 2011-01-09 Description The distinctive characteristics of the shells of the Seguenzioidea are: * the nacreous layer (a plesiomorphic character, i.e. a character state that a taxon is inferred to have been retained from its ancestors) This occurs also in the following families: Pleurotomariidae, Haliotidae, Turbinidae, Trochidae, and possibly in the Skeneidae. * the protoconch has a trochoid shape. * usually with one or more labral sinuses. This character is also found is several other superfamilies such as Neomphaloidea, Pleurotomarioidea, Fissurelloidea, and Scissurelloidea and in the families Siliquariidae and Turridae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. '' Panthera leo'' (lion) and '' Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. phylogenetic analysis should c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the absence of a visible shell. Definition Determining whether some gastropods should be called sea snails is not always easy. Some species that live in brackish water (such as certain neritids) can be listed as either freshwater snails or marine snails, and some species that live at or just above the high tide level (for example species in the genus '' Truncatella'') are sometimes considered to be sea snails and sometimes listed as land snails A land snail is any of the numerous species of snail that live on land, as opposed to the sea snails and freshwater snails. ''Land snail'' is the common name for terrestrial gastropod mollusks that have shells (those without shells are known .... Anatomy Sea snails are a very large group o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine (ocean)
The ocean (also the sea or the world ocean) is the body of salt water that covers approximately 70.8% of the surface of Earth and contains 97% of Earth's water. An ocean can also refer to any of the large bodies of water into which the world ocean is conventionally divided."Ocean." ''Merriam-Webster.com Dictionary'', Merriam-Webster, [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. There are many thousands of species of sea snails and slugs, as well as freshwater snails, freshwater limpets, and land snails and slugs. The class Gastropoda contains a vast total of named species, second only to the insects in overall number. The fossil history of this class goes back to the Late Cambrian. , 721 families of gastropods are known, of which 245 are extinct and appear only in the fossil record, while 476 are currently extant with or without a fossil record. Gastropoda (previously known as univalves and sometimes spelled "Gasteropoda") are a major part of the phylum Mollusca, and are the most highly diversified class in the phylum, with 65,000 to 80,000 living snail and slug species. The anatomy, behavior, feeding, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 estimated between 60,000 and 100,000 additional species. The proportion of undescribed species is very high. Many taxa remain poorly studied. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrial habitats. They are highly diverse, not just in size and anatomical structure, but also in behaviour and habitat. The phylum is typically divided into 7 or 8 taxonomic classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish, and octopuses, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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