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Ringicella
''Ringicella'' is a genus of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Odontostomidae. Adult snails of this genus have an extremely unusual shell morphology, very similar to that found in the genus '' Anostoma'' Fischer von Waldheim, 1807, of which this genus was previously considered to be merely a subgenus. The adult snails in this genus carry their shells upside down, with the spire or apex at the bottom, and the umbilicus at the top. Shell description The shell of ''Ringicella'' is very similar to that of '' Anostoma''. Shells of the genus ''Ringicella'' have an additional feature: the angular lamella and upper suprapalatal fold are concrescent, forming a perforation in the lip at its upper end. In addition, the apertural rim incorporates a small tube, which communicates with the interior of the shell. The width of adult shells varies from 18 to 25 mm. Anatomy This section is based on the anatomy of ''Ringice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ringicella Ringens Shell
''Ringicella'' is a genus of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Odontostomidae. Adult snails of this genus have an extremely unusual shell morphology, very similar to that found in the genus ''Anostoma'' Fischer von Waldheim, 1807, of which this genus was previously considered to be merely a subgenus. The adult snails in this genus carry their shells upside down, with the spire or apex at the bottom, and the umbilicus at the top. Shell description The shell of ''Ringicella'' is very similar to that of ''Anostoma''. Shells of the genus ''Ringicella'' have an additional feature: the angular lamella and upper suprapalatal fold are concrescent, forming a perforation in the lip at its upper end. In addition, the apertural rim incorporates a small tube, which communicates with the interior of the shell. The width of adult shells varies from 18 to 25 mm. Anatomy This section is based on the anatomy of ''Ringicell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ringicella Carinatum Shell
''Ringicella'' is a genus of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Odontostomidae. Adult snails of this genus have an extremely unusual shell morphology, very similar to that found in the genus ''Anostoma'' Fischer von Waldheim, 1807, of which this genus was previously considered to be merely a subgenus. The adult snails in this genus carry their shells upside down, with the spire or apex at the bottom, and the umbilicus at the top. Shell description The shell of ''Ringicella'' is very similar to that of ''Anostoma''. Shells of the genus ''Ringicella'' have an additional feature: the angular lamella and upper suprapalatal fold are concrescent, forming a perforation in the lip at its upper end. In addition, the apertural rim incorporates a small tube, which communicates with the interior of the shell. The width of adult shells varies from 18 to 25 mm. Anatomy This section is based on the anatomy of ''Ringicell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ringicella Carinatum Aperture
''Ringicella'' is a genus of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Odontostomidae. Adult snails of this genus have an extremely unusual shell morphology, very similar to that found in the genus ''Anostoma'' Fischer von Waldheim, 1807, of which this genus was previously considered to be merely a subgenus. The adult snails in this genus carry their shells upside down, with the spire or apex at the bottom, and the umbilicus at the top. Shell description The shell of ''Ringicella'' is very similar to that of ''Anostoma''. Shells of the genus ''Ringicella'' have an additional feature: the angular lamella and upper suprapalatal fold are concrescent, forming a perforation in the lip at its upper end. In addition, the apertural rim incorporates a small tube, which communicates with the interior of the shell. The width of adult shells varies from 18 to 25 mm. Anatomy This section is based on the anatomy of ''Ringicell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ringicella Ringens 2
''Ringicella'' is a genus of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Odontostomidae. Adult snails of this genus have an extremely unusual shell morphology, very similar to that found in the genus ''Anostoma'' Fischer von Waldheim, 1807, of which this genus was previously considered to be merely a subgenus. The adult snails in this genus carry their shells upside down, with the spire or apex at the bottom, and the umbilicus at the top. Shell description The shell of ''Ringicella'' is very similar to that of ''Anostoma''. Shells of the genus ''Ringicella'' have an additional feature: the angular lamella and upper suprapalatal fold are concrescent, forming a perforation in the lip at its upper end. In addition, the apertural rim incorporates a small tube, which communicates with the interior of the shell. The width of adult shells varies from 18 to 25 mm. Anatomy This section is based on the anatomy of ''Ringicell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anostoma
''Anostoma'', common name the up-mouth snails, is a genus of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Odontostomidae.Breure A. S. H. & Ablett J. D. (2012) "Annotated type catalogue of the Bothriembryontidae and Odontostomidae (Mollusca, Gastropoda, Orthalicoidea) in the Natural History Museum, London". ''ZooKeys'' 182: 1-70. . Snails in this genus are found in Brazil. Adult snails in this genus have an extremely unusual shell morphology: the aperture of the adult shell faces directly "upwards", in other words, in the same direction as the spire. This seemingly impossible arrangement is made possible because the adult shell is carried upside down. In 1901, the American malacologist Henry Augustus Pilsbry commented that the adult shell of ''Anostoma'' is "so bizarre that in the total absence of information upon its life history, no useful theory can be formulated to account for its peculiarities." A very similar shell is found in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Odontostomidae
Odontostomidae is a taxonomic family of medium-sized to large, air-breathing, tropical and sub-tropical land snails, terrestrial pulmonate gastropod molluscs in the superfamily Orthalicoidea.Breure A. S. H. & Romero P. (2012). "Support and surprises: molecular phylogeny of the land snail superfamily Orthalicoidea using a three-locus gene analysis with a divergence time analysis and ancestral area reconstruction (Gastropoda: Stylommatophora)". '' Archiv für Molluskenkunde: International Journal of Malacology'' 141(1): 1-20. . Taxonomy 2005 taxonomy This taxon was placed as the tribe Odontostomini, in the subfamily Bulimulinae, within the family Orthalicidae, according to the taxonomy of the Gastropoda (Bouchet & Rocroi, 2005). 2010 taxonomy Breure et al. (2010) elevated Odontostomini to Odontostomidae.Breure A. S. H., Groenenberg D. S. J. & Schilthuizen M. (2010). "New insights in the phylogenetic relations within the Orthalicoidea (Gastropoda, Stylommatophora) based o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spire (mollusc)
A spire is a part of the coiled shell of molluscs. The spire consists of all of the whorls except for the body whorl. Each spire whorl represents a rotation of 360°. A spire is part of the shell of a snail, a gastropod mollusc, a gastropod shell, and also the whorls of the shell in ammonites, which are fossil shelled cephalopods. In textbook illustrations of gastropod shells, the tradition (with a few exceptions) is to show most shells with the spire uppermost on the page. The spire, when it is not damaged or eroded, includes the protoconch (also called the nuclear whorls or the larval shell), and most of the subsequent teleoconch whorls (also called the postnuclear whorls), which gradually increase in area as they are formed. Thus the spire in most gastropods is pointed, the tip being known as the "apex". The word "spire" is used, in an analogy to a church spire or rock spire, a high, thin, pinnacle. The "spire angle" is the angle, as seen from the apex, at which a spire ... [...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, and re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radula
The radula (, ; plural radulae or radulas) is an anatomical structure used by molluscs for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the esophagus. The radula is unique to the molluscs, and is found in every class of mollusc except the bivalves, which instead use cilia, waving filaments that bring minute organisms to the mouth. Within the gastropods, the radula is used in feeding by both herbivorous and carnivorous snails and slugs. The arrangement of teeth ( denticles) on the radular ribbon varies considerably from one group to another. In most of the more ancient lineages of gastropods, the radula is used to graze, by scraping diatoms and other microscopic algae off rock surfaces and other substrates. Predatory marine snails such as the Naticidae use the radula plus an acidic secretion to bore through the shell of other molluscs. Other predatory marine snails ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umbilicus (mollusc)
The umbilicus of a shell is the axially aligned, hollow cone-shaped space within the whorls of a coiled mollusc shell. The term umbilicus is often used in descriptions of gastropod shells, i.e. it is a feature present on the ventral (or under) side of many (but not all) snail shells, including some species of sea snails, land snails, and freshwater snails. The word is also applied to the depressed central area on the planispiral coiled shells of ''Nautilus'' species and fossil ammonites. (These are not gastropods, but shelled cephalopods.) In gastropods The spirally coiled whorls of gastropod shells frequently connect to each other by their inner sides, during the natural course of its formation. This results in a more or less solid central axial pillar, known as the columella. The more intimate the contact between the concave side of the whorls is, the more solid the columella becomes. On the other hand, if this connection is less intense, a hollow space inside the whorls may re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apex (mollusc)
In anatomy, an apex (adjectival form: apical) is part of the shell of a mollusk. The apex is the pointed tip (the oldest part) of the shell of a gastropod, scaphopod, or cephalopod. The apex is used in end-blown conches. Gastropods The word "apex" is most often used to mean the tip of the spire of the shell of a gastropod. The apex is the first-formed, and therefore the oldest, part of the shell. To be more precise, the apex would usually be where the tip of the embryonic shell or protoconch is situated, if that is still present in the adult shell (often it is lost or eroded away). Coiled gastropod shells The phrase apical whorls, or protoconch, means the whorls that constitute the embryonic shell at the apex of the shell, especially when this is clearly distinguishable from the later whorls of the shell, otherwise known as the teleoconch. Comparison of the apical part and the whole shell of ''Otukaia kiheiziebisu'': File:Calliostoma kiheiziebisu apex.png File:Calliostoma k ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
