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.jpg) Odostomia pallida, O. conoidea, O. conspicua, O. truncatula
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Odostomiidae, Odostomia snails and their allies, is a taxonomic family of minute parasitic sea snails. Taxonomy is the practice and science of classification The word comes from the Greek, taxis (meaning 'order' 'arrangement' and, nomos Family denotes a group of People affiliated by consanguinity affinity or co-residence Parasitism is a type of symbiotic relationship between Organisms of different Species. The word snail is a Common name that can be used for almost all members of the Molluscan class Gastropoda which have coiled shells in the These are marine heterobranch gastropod mollusks, or micromollusks, in the superfamily Pyramidelloidea. Marine is an Umbrella term. As an adjective it is usually applicable to things relating to the Sea or Ocean, such as Marine biology, Marine Heterobranchia, the heterobranchs, (meaning "different-gilled snails" is a Taxonomic Superorder of sea Snails marine The class Gastropoda or the gastropods, also previously known as gasteropods, or univalves, and more commonly known as Snails Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 A micromollusk is a descriptive term for a shelled Mollusk which is extremely small even at full adult size Above the species level close to 400 named taxa are referred to the gastropod superfamily Pyramidelloidea.
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Systematics
According to Schander, van Aartsen & Corgan (1999) there are four subfamilies within the family. Other Authors (e. g. Ponder & Lindberg, 1997 & Bouchet & Rocroi, 2005) considers Odostomiidae to be a part of the family Pyramidellidae. Pyramidellidae, Common name the pyram family, or pyramid shells, is a voluminous Taxonomic family of mostly small and minute
Taxonomy of Schander, Van Aartsen & Corgan (1999)
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- Family Odostomiidae Pelseneer, 1928
- Subfamily Odostomiinae Pelseneer, 1928
- Subfamily Chrysallidinae Saurin, 1958
- Subfamily Odostomellinae Saurin, 1958
- Subfamily Cyclostremellinae Moore, 1966
- Family Odostomiidae Pelseneer, 1928
Distribution
This family is found worldwide, From the tropics to the poles. Odostomiinae, Odostomia snails and their allies is a Taxonomic Subfamily of minute Parasitic sea Snails These are marine Chrysallidinae is a Taxonomic group of very small sea Snails one of eleven recognized Subfamilies of the Gastropod family Pyramidellidae Odostomellinae is a Taxonomic Subfamily of minute sea Snails marine Gastropod Molluscs within the family Pyramidellidae Cyclostremellinae is a Subfamily, a Taxonomic grouping of minute sea Snails marine Gastropod Mollusks or Micromollusks
Shell description
The shell of these snails has a blunt, heterostrophic protoconch, which is often pointed sideways or wrapped up. A protoconch (meaning first or earliest or original shell is an Embryonic or Larval shell of some classes of Molluscs e Most species in the family have shells which are smaller than 13 mm. The texture of these shells is most often smooth but sometimes sculptured in various forms such as ribs and spirals. Sculpture on a Mollusc shell is whatever natural 3-dimensional ornamentation exists on the outer surface of a shell apart from the basic shape of the shell itself Their color is mostly white, cream or yellowish, sometimes with red or brown lines. The teleoconch is dextrally coiled, but the larval shells are sinistral. A larva ( Latin; plural larvae) is a juvenile form of Animal with indirect development, undergoing Metamorphosis (for example This results in a sinistrally coiled protoconch. The columella has usually one, but sometimes several, spiral folds. The columella (meaning little column is an anatomical feature of a coiled Snail shell or Gastropod shell. A plait is a feature which is present in some Snail shells. This feature occurs often in the shells of marine Gastropod Mollusks The aperture is closed by an operculum. The operculum, meaning little lid (plural opercula or operculums is a corneous or Calcareous structure which exists in some groups of marine freshwater and land
Life habits
The Odostomiidae are ectoparasites, feeding mainly on other molluscs and on annelid worms, but some are known to feed on peanut worms and crustaceans (e. Parasitism is a type of symbiotic relationship between Organisms of different Species. A worm is a common name given to a diverse group of invertebrate animals that have a long soft body and no legs Structure of crustaceans As Arthropods crustaceans have a stiff Exoskeleton, which must be shed to allow the animal to grow ( Ecdysis or molting g. Sneli, 1972).
They do not have a radula. The radula is a toothed Chitinous ribbon typically used for scraping cutting and chewing food before it enters the Esophagus. Instead their long proboscis is used to pierce the skin of its prey and suck up its fluids and soft tissues. In general a proboscis (from Greek προ pro "before" and βοσκειν boskein "to feed" also known as probiscus The eyes on the grooved tentacles are situated toward the base of the tentacles. Between the head and the foot, a lobed process called the mentum ( = thin projection) is visible. The mentum refers to a projecting structure near the mouth of any of several animals In Insects the mentum is the distal part of the labium. These molluscs are hermaphrodites. A hermaphrodite is an organism having both male and female reproductive organs
References
- Bouchet, P. & Rocroi, J. -P. (2005). "Classification and Nomenclator of Gastropod Families". Malacologia 53 (1-2): 1-397.
- Pelseneer, P. (1928). "Les Parasites des Mollusques et les Mollusques parasites". Bulletin de la Sociéte Zoologique de France/Évolution et Zoologie 53: 158-189.
- Ponder, W. F. & Lindberg, D. R. (1997). "Towards a phylogeny of gastropod molluscs: an analysis using morphological characters". Zoological Journal of the Linnean Society 119: 88-265.
- Schander, C. , van Aartsen, J. J. , Corgan, J. C. (1999). "Families and genera of the Pyramidelloidea (Mollusca: Gastropoda)". Bollettino Malacologico 34 (9-12): 145-166.
- Sneli, J. -A. (1972). "Odostomia turrita found on Hommarus gammarus". Nautilus 86 (1): 23-24.
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This gastropod-related article is a stub. The class Gastropoda or the gastropods, also previously known as gasteropods, or univalves, and more commonly known as Snails You can help Wikipedia by expanding it. |
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