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Apertural Lip
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term ''aperture'' is used for the main opening in gastropod shells, scaphopod shells, and also for ''Nautilus'' and ammonite shells. The word is not used to describe bivalve shells, where a natural opening between the two shell valves in the closed position is usually called a ''gape''. Scaphopod shells are tubular, and thus they have two openings: a main anterior aperture and a smaller posterior aperture. As well as the aperture, some gastropod shells have additional openings in their shells for respiration; this is the case in some Fissurellidae (keyhole limpets) where the central smaller opening at the apex of the shell is called an orifice, and in the Haliotidae (abalones) where the row of respiratory openings in the shell are also called orifices. In gastropods In some prosobranch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norelona Pyrenaica Shell
''Norelona '' is a monospecific genus of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Elonidae. MolluscaBase eds. (2021). MolluscaBase. Norelona H. Nordsieck, 1986. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=996224 on 2021-10-03 Species * ''Norelona pyrenaica ''Norelona pyrenaica'' is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Elonidae. ''Norelona pyrenaica'' is the type species of the genus '' Norelona''. Shell description The shell is narrowl ...'' (Draparnaud, 1805) References * Nordsieck, H. (1986). Das System der tertiären Helicoidea Mittel- und Westeuropas (Gastropoda: Stylommatophora). Heldia. 1(4): 109-120. * Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. {{taxonbar, from=Q18591393 Elonidae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plait (gastropod)
A plait is an anatomical feature which is present the shells of some snails, or gastropods. This sculpture occurs often in the shells of marine gastropod mollusks in the clade Neogastropoda, but it is also found in some pulmonate land snails. Plaits are folds on the columella (also known as the pillar or axis) at the center of the shell. The columella (meaning little column) is the central structure around which the whorl A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane floral ...s of a coiled gastropod shell are coiled. The presence or absence of plaits, and the number of plaits, are characteristics used in the description of many gastropod molluscs, often enabling similar species to be separated and identified correctly. References * Powell A W B, ''New Zealand Mollusca'', William C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Personidae
The Personidae are a family of sea snails, marine gastropod molluscs in the order Littorinimorpha Littorinimorpha is a large order of snails, gastropods, consisting primarily of sea snails ( marine species), but also including some freshwater snails ( aquatic species) and land snails (terrestrial species).Bouchet P. & Rocroi J.-P. (Ed.); Frà .... MolluscaBase eds. (2021). MolluscaBase. Personidae Gray, 1854. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=23090 on 2021-12-30 Taxonomy * '' Distorsio'' Röding, 1798 * †'' Kotakaia'' Beu, 1988 * '' Personopsis'' Beu, 1988 ;Synonyms: * ''Calcarella'' Souleyet, 1850: synonym of ''Distorsio'' Röding, 1798 * ''Distorta'' Perry, 1811: synonym of ''Distorsio'' Röding, 1798 * ''Distortrix'' Link, 1807: synonym of ''Distorsio'' Röding, 1798 (objective synonym of Distorsio) * ''Persona'' Montfort, 1810: synonym of ''Distorsio'' Röding, 1798 (objective synonym of Dist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dialeuca Conspersula
''Dialeuca'' is a genus of gastropods belonging to the family Cepolidae. The species of this genus are found in Central America. Species: * '' Dialeuca blandiana'' (C. B. Adams, 1850) * ''Dialeuca conspersula ''Dialeuca'' is a genus of gastropods belonging to the family Cepolidae. The species of this genus are found in Central America. Species: * ''Dialeuca blandiana'' (C. B. Adams, 1850) * '' Dialeuca conspersula'' (L. Pfeiffer, 1846) * ''Dialeuca ...'' (L. Pfeiffer, 1846) * '' Dialeuca nemoraloides'' (Adams, 1845) * '' Dialeuca subconica'' (C. B. Adams, 1845) References * Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. Last update: July 16th, 2017. External links Albers, J. C. (1850). Die Heliceen nach natürlicher Verwandtschaft systematisch geordnet. Berlin: Enslin. 262 pp {{Taxonbar, from=Q106797930 Cepolidae (gastropods) Gastropod genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyalosagda Arboreoides
''Hyalosagda arboreoides'' is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Sagdidae. Distribution This species occurs in Jamaica Jamaica (; ) is an island country situated in the Caribbean Sea. Spanning in area, it is the third-largest island of the Greater Antilles and the Caribbean (after Cuba and Hispaniola). Jamaica lies about south of Cuba, and west of His .... Tryon G. W. 1887 ''Manual of conchology; structural and systematic. With illustrations of the species''. Second series: PulmonataVolume 3 Helicidae - Volume I. pag8 References External links * Photos at Sagdidae Gastropods described in 1845 {{Sagdidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Melongenidae
The Melongenidae, the crown conchs and their relatives, are a taxonomic family of large to very large marine gastropods in the superfamily Buccinoidea. MolluscaBase eds. (2021). MolluscaBase. Melongenidae Gill, 1871 (1854). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=160182 on 2021-02-27 Taxonomy For a while prior to 2004, the genera ''Busycon'' and ''Busycotypus'' were placed in the Melongenidae. Then, in 2004, based on their digestive systems and on cladistic analysis by Kosyan & Kantor (2004),Kosyan A. R. & Kantor Yu. I. (2004). "Morphology, taxonomic status and relationships of Melongenidae (Gastropoda: Neogastropoda)". ''Ruthenica'' 14(1): 9-36abstract and preview/ref> these two genera were moved to the family Busyconidae within the superfamily Buccinoidea. According to the taxonomy of the Gastropoda by Bouchet & Rocroi (2005), the Melongenidae consists of two subfamilies: * Subfamily Melongeninae Gill, 18 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auriculella
''Auriculella'' is a genus of air-breathing tropical land snails, terrestrial pulmonate gastropod mollusks in the family Achatinellidae. They are endemic to Hawaii (United States) and several species are extinct. They are oviparous (egg laying) and hermaphroditic. Among achatinellid snails, they are unique in the fact that they are not restricted to living on plants endemic to the Hawaiian islands. They have been known to relatively thrive on non-native plants such as ginger and night jasmine. ''Auriculella'' is the type genus of the subfamily Auriculellinae. Species Species within the genus ''Auriculella'' include: * ''Auriculella auricula'' * ''Auriculella ambusta'' * ''Auriculella brunnea'' * ''Auriculella castanea'' * ''Auriculella canalifera'' * ''Auriculella cerea'' * ''Auriculella crassula'' * ''Auriculella diaphana'' *†''Auriculella expansa'' * ''Auriculella perpeusilla'' * ''Auriculella flavida'' * ''Auriculella malleata'' * ''Auriculella minuta'' * ''Auriculella new ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helix
A helix () is a shape like a corkscrew or spiral staircase. It is a type of smooth space curve with tangent lines at a constant angle to a fixed axis. Helices are important in biology, as the DNA molecule is formed as two intertwined helices, and many proteins have helical substructures, known as alpha helices. The word ''helix'' comes from the Greek word ''ἕλιξ'', "twisted, curved". A "filled-in" helix – for example, a "spiral" (helical) ramp – is a surface called ''helicoid''. Properties and types The ''pitch'' of a helix is the height of one complete helix turn, measured parallel to the axis of the helix. A double helix consists of two (typically congruent) helices with the same axis, differing by a translation along the axis. A circular helix (i.e. one with constant radius) has constant band curvature and constant torsion. A ''conic helix'', also known as a ''conic spiral'', may be defined as a spiral on a conic surface, with the distance to the apex an expo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columella (gastropod)
The columella (meaning "little column") or (in older texts) pillar is a central anatomical feature of a coiled snail shell, a gastropod shell. The columella is often only clearly visible as a structure when the shell is broken, sliced in half vertically, or viewed as an X-ray image. The columella runs from the apex of the shell to the midpoint of the undersurface of the shell, or the tip of the siphonal canal in those shells which have a siphonal canal. If a snail shell is visualized as a cone of shelly material which is wrapped around a central axis, then the columella more or less coincides spatially with the central axis of the shell. In the case of shells that have an umbilicus, the columella is a hollow structure. The columella of some groups of gastropod shells can have a number of plications or folds (the columellar fold, plaits or plicae), which are usually visible when looking to the inner lip into the aperture of the shell. These folds can be wide or narrow, prominent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siphonal Notch
A siphonal notch is a feature of the shell anatomy in some sea snails, marine gastropod mollusks. In these particular groups of sea snails the animal has a soft tubular anterior extension of the mantle called a siphon through which water is drawn into the mantle cavity and over the gill and which serves as a chemoreceptor to locate food. This siphonal opening also serves for the exit of the water that has entered by the branchial opening. The siphonal notch is a noticeable notch situated at the most posterior part of the aperture of the shell, through which the siphon is extended when the animal is active. The notch at the posterior end of the aperture is also called the anal notch, anal sinus, anal canal or posterior canal. Instead of a simple siphonal notch, some gastropods have an elongated siphonal canal, a hard shell tube which extends out from the anterior edge of the aperture. See also * Siphonal canal * Stromboid notch The stromboid notch is an anatomical feature whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
