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Aplexa Disjuncta
''Aplexa'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. Shell description These small snails are quite distinctive, because they have shells that are sinistral, which means that if you hold the shell such that the spire is pointing up, then the aperture is on the left-hand side. The shells of ''Aplexa'' species have a long and large aperture, a relatively high and pointed spire, and no operculum. The shells are thin and corneous and rather transparent. Species Species in the genus ''Aplexa'' include: * '' Aplexa atava'' White, 1877 * '' Aplexa brevispirata'' (Cossmann, 1913) * '' Aplexa disjuncta'' (White, 1879) * '' Aplexa elongata'' (Say, 1821) - the lance aplexa * ''Aplexa gigantea'' (Michaud, 1837) * ''Aplexa grasseti'' (Matheron, 1878) * ''Aplexa heberti'' (Deshayes, 1863) * ''Aplexa hypnorum'' (Linnaeus, 1758) - the moss bladder snail * ''Aplexa jaimei'' (Hermite, 1879) * ''A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod Shell
The gastropod shell is part of the body of a Gastropoda, gastropod or snail, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or in some cases the shell is reduced such that the body cannot be retracted within it (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the Aperture (mollusc), aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group. Shell layers The gastropod shell has three major layers secreted by the Mantle (mollusc), mantle. The calcareous central layer, tracum, is typically made of calcium carbonate precipitated into an organic matrix known as c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulmonate
Pulmonata or pulmonates, is an informal group (previously an order, and before that a subclass) of snails and slugs characterized by the ability to breathe air, by virtue of having a pallial lung instead of a gill, or gills. The group includes many land and freshwater families, and several marine families. The taxon Pulmonata as traditionally defined was found to be polyphyletic in a molecular study per Jörger ''et al.'', dating from 2010. Pulmonata are known from the Carboniferous Period to the present. Pulmonates have a single atrium and kidney, and a concentrated, symmetrical, nervous system. The mantle cavity is located on the right side of the body, and lacks gills, instead being converted into a vascularised lung. Most species have a shell, but no operculum, although the group does also include several shell-less slugs. Pulmonates are hermaphroditic, and some groups possess love darts. Linnean taxonomy The taxonomy of this group according to the taxonomy of the Ga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aplexa Jaimei
''Aplexa'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. Shell description These small snails are quite distinctive, because they have shells that are sinistral, which means that if you hold the shell such that the spire is pointing up, then the aperture is on the left-hand side. The shells of ''Aplexa'' species have a long and large aperture, a relatively high and pointed spire, and no operculum. The shells are thin and corneous and rather transparent. Species Species in the genus ''Aplexa'' include: * '' Aplexa atava'' White, 1877 * '' Aplexa brevispirata'' (Cossmann, 1913) * '' Aplexa disjuncta'' (White, 1879) * '' Aplexa elongata'' (Say, 1821) - the lance aplexa * '' Aplexa gigantea'' (Michaud, 1837) * '' Aplexa grasseti'' (Matheron, 1878) * '' Aplexa heberti'' (Deshayes, 1863) * ''Aplexa hypnorum'' (Linnaeus, 1758) - the moss bladder snail * '' Aplexa jaimei'' (Hermite, 1879) * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aplexa Heberti
''Aplexa'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. Shell description These small snails are quite distinctive, because they have shells that are sinistral, which means that if you hold the shell such that the spire is pointing up, then the aperture is on the left-hand side. The shells of ''Aplexa'' species have a long and large aperture, a relatively high and pointed spire, and no operculum. The shells are thin and corneous and rather transparent. Species Species in the genus ''Aplexa'' include: * '' Aplexa atava'' White, 1877 * '' Aplexa brevispirata'' (Cossmann, 1913) * '' Aplexa disjuncta'' (White, 1879) * '' Aplexa elongata'' (Say, 1821) - the lance aplexa * '' Aplexa gigantea'' (Michaud, 1837) * '' Aplexa grasseti'' (Matheron, 1878) * '' Aplexa heberti'' (Deshayes, 1863) * ''Aplexa hypnorum'' (Linnaeus, 1758) - the moss bladder snail * ''Aplexa jaimei'' (Hermite, 1879) * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aplexa Grasseti
''Aplexa'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. Shell description These small snails are quite distinctive, because they have shells that are sinistral, which means that if you hold the shell such that the spire is pointing up, then the aperture is on the left-hand side. The shells of ''Aplexa'' species have a long and large aperture, a relatively high and pointed spire, and no operculum. The shells are thin and corneous and rather transparent. Species Species in the genus ''Aplexa'' include: * '' Aplexa atava'' White, 1877 * '' Aplexa brevispirata'' (Cossmann, 1913) * '' Aplexa disjuncta'' (White, 1879) * '' Aplexa elongata'' (Say, 1821) - the lance aplexa * '' Aplexa gigantea'' (Michaud, 1837) * '' Aplexa grasseti'' (Matheron, 1878) * ''Aplexa heberti'' (Deshayes, 1863) * ''Aplexa hypnorum'' (Linnaeus, 1758) - the moss bladder snail * ''Aplexa jaimei'' (Hermite, 1879) * ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aplexa Gigantea
''Aplexa'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. Shell description These small snails are quite distinctive, because they have shells that are sinistral, which means that if you hold the shell such that the spire is pointing up, then the aperture is on the left-hand side. The shells of ''Aplexa'' species have a long and large aperture, a relatively high and pointed spire, and no operculum. The shells are thin and corneous and rather transparent. Species Species in the genus ''Aplexa'' include: * '' Aplexa atava'' White, 1877 * '' Aplexa brevispirata'' (Cossmann, 1913) * '' Aplexa disjuncta'' (White, 1879) * '' Aplexa elongata'' (Say, 1821) - the lance aplexa * '' Aplexa gigantea'' (Michaud, 1837) * ''Aplexa grasseti'' (Matheron, 1878) * ''Aplexa heberti'' (Deshayes, 1863) * ''Aplexa hypnorum'' (Linnaeus, 1758) - the moss bladder snail * ''Aplexa jaimei'' (Hermite, 1879) * '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aplexa Elongata
''Sibirenauta elongata'' is a species of gastropods belonging to the family Physidae Physidae, common name the bladder snails, is a monophyletic taxonomic family of small air-breathing freshwater snails, aquatic pulmonate gastropod molluscs in the superfamily Lymnaeoidea .MolluscaBase eds. (2021). MolluscaBase. Physidae Fitzin .... The species is found in Northern America. References Physidae {{Improve categories, date=February 2022 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aplexa Disjuncta
''Aplexa'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. Shell description These small snails are quite distinctive, because they have shells that are sinistral, which means that if you hold the shell such that the spire is pointing up, then the aperture is on the left-hand side. The shells of ''Aplexa'' species have a long and large aperture, a relatively high and pointed spire, and no operculum. The shells are thin and corneous and rather transparent. Species Species in the genus ''Aplexa'' include: * '' Aplexa atava'' White, 1877 * '' Aplexa brevispirata'' (Cossmann, 1913) * '' Aplexa disjuncta'' (White, 1879) * '' Aplexa elongata'' (Say, 1821) - the lance aplexa * ''Aplexa gigantea'' (Michaud, 1837) * ''Aplexa grasseti'' (Matheron, 1878) * ''Aplexa heberti'' (Deshayes, 1863) * ''Aplexa hypnorum'' (Linnaeus, 1758) - the moss bladder snail * ''Aplexa jaimei'' (Hermite, 1879) * ''A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aplexa Brevispirata
''Aplexa'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. Shell description These small snails are quite distinctive, because they have shells that are sinistral, which means that if you hold the shell such that the spire is pointing up, then the aperture is on the left-hand side. The shells of ''Aplexa'' species have a long and large aperture, a relatively high and pointed spire, and no operculum. The shells are thin and corneous and rather transparent. Species Species in the genus ''Aplexa'' include: * '' Aplexa atava'' White, 1877 * '' Aplexa brevispirata'' (Cossmann, 1913) * ''Aplexa disjuncta'' (White, 1879) * '' Aplexa elongata'' (Say, 1821) - the lance aplexa * ''Aplexa gigantea'' (Michaud, 1837) * ''Aplexa grasseti'' (Matheron, 1878) * ''Aplexa heberti'' (Deshayes, 1863) * ''Aplexa hypnorum'' (Linnaeus, 1758) - the moss bladder snail * ''Aplexa jaimei'' (Hermite, 1879) * ''Ap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aplexa Atava
''Aplexa'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. Shell description These small snails are quite distinctive, because they have shells that are sinistral, which means that if you hold the shell such that the spire is pointing up, then the aperture is on the left-hand side. The shells of ''Aplexa'' species have a long and large aperture, a relatively high and pointed spire, and no operculum. The shells are thin and corneous and rather transparent. Species Species in the genus ''Aplexa'' include: * '' Aplexa atava'' White, 1877 * ''Aplexa brevispirata'' (Cossmann, 1913) * ''Aplexa disjuncta'' (White, 1879) * '' Aplexa elongata'' (Say, 1821) - the lance aplexa * ''Aplexa gigantea'' (Michaud, 1837) * ''Aplexa grasseti'' (Matheron, 1878) * ''Aplexa heberti'' (Deshayes, 1863) * ''Aplexa hypnorum'' (Linnaeus, 1758) - the moss bladder snail * ''Aplexa jaimei'' (Hermite, 1879) * ''Apl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Operculum (gastropod)
The operculum (; ) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also in a few groups of land snails; the structure is found in some marine and freshwater gastropods, and in a minority of terrestrial gastropods, including the families Helicinidae, Cyclophoridae, Aciculidae, Maizaniidae, Pomatiidae, etc. The operculum is attached to the upper surface of the foot and in its most complete state, it serves as a sort of "trapdoor" to close the aperture of the shell when the soft parts of the animal are retracted. The shape of the operculum varies greatly from one family of gastropods to another. It is fairly often circular, or more or less oval in shape. In species where the operculum fits snugly, its outline corresponds exactly to the shape of the aperture of the shell and it serves to seal the entrance of the shell. Many families have opercula that are reduced in size, and which a ... [...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] |
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