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See text. Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 The class Gastropoda or the gastropods, also previously known as gasteropods, or univalves, and more commonly known as Snails Orthogastropoda is one of two major Taxonomic groupings of snails and slugs an extremely large Subclass within the huge class Gastropoda. Above the species level close to 400 named taxa are referred to the gastropod superfamily Pyramidelloidea. Pyramidellidae, Common name the pyram family, or pyramid shells, is a voluminous Taxonomic family of mostly small and minute |
Odostomellinae is a taxonomic subfamily of minute sea snails, marine gastropod molluscs within the family Pyramidellidae the pyrams and their allies. Taxonomy is the practice and science of classification The word comes from the Greek, taxis (meaning 'order' 'arrangement' and, nomos In Biological classification, family ( Latin 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 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 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 Pyramidellidae, Common name the pyram family, or pyramid shells, is a voluminous Taxonomic family of mostly small and minute This is one of eleven recognised subfamilies of the family Pyramidellidae (according to the taxonomy of Ponder & Lindberg, 1997). Pyramidellidae, Common name the pyram family, or pyramid shells, is a voluminous Taxonomic family of mostly small and minute The subfamily contains two genera; Herviera and Odostomella (Schander and co-workers 1999).
In the taxonomy of Bouchet & Rocroi (2005), this subfamily has been downgraded to the rank of tribe Odostomellini Saurin, 1959 in the subfamily Pyramidellinae Gray, 1840 . The new Gastropod Taxonomy of Bouchet & Rocroi (2005 (in collaboration with J In Biology, a tribe &mdashor infrafamily&mdashis a Taxonomic rank between family and Genus. Pyramidellinae is a taxonomic Subfamily of minute sea Snails marine Gastropod Mollusks in the family Pyramidellidae
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Genera
- Odostomella Bucquoy, Dautzenberg & Dollfus, 1883 (Type genus)
- Heviera Melvill & Standen, 1899
Distribution
The subfamily occurs in tropic and temperate seas.
Shell description
The shell of these snails has a blunt, heterostrophic protoconch, which is wrapped up. A protoconch (meaning first or earliest or original shell is an Embryonic or Larval shell of some classes of Molluscs e The texture of these shells is sculptured with ribs. 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, brown, 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 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 Odostomellinae are ectoparasites, but the hosts are unknown. Parasitism is a type of symbiotic relationship between Organisms of different Species.
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, laying eggs in jelly-like masses on the shell of its host. A hermaphrodite is an organism having both male and female reproductive organs Some species have spermatophores (Schander, Hori & Lundberg, 1999)
References
- Bouchet, P. A spermatophore is a capsule or mass created by males of various Animal species containing Spermatozoa and transferred in entirety to the female's Ovipore & Rocroi, J. -P. (2005). "Classification and Nomenclator of Gastropod Families". Malacologia 47 (1-2): 1–397.
- 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.
- Saurin, E. (1958). "Pyramidellidae de Pho-Hai (Sud Viet-Nam)". Annales de la Faculté des Sciences de Saigon 35: 63–86.
- 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.
- Schander, C. , Hori, S. , Lundberg, J. (1999). "Anatomy, Phylogeny and biology of Odostomella and Herviera, with the description of a new species of Odostomella (Mollusca, Heterostropha, Pyramidellidae)". Ophelia 51 (1): 39–76.
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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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