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Encyclopedia > Operculum

In Biology operculum (Latin for "little lid") has been used to describe several completely separate features. Biology is the science of life (from the Greek words bios = life and logos = reasoned account). ...

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Gastropods

The operculum (plural : opercula or operculums) of gastropods is a corneous plate at the opening of the shell, attached dorsally to the foot. This fingernail-like structure seals the aperture, serving as a cover against predators when the snail body is retracted. It also enables the snail to survive periods of drought. Subclass Subclass Eogastropoda     Patellogastropoda Subclass Orthogastropoda   Superorder Cocculiniformia   Superorder Hot Vent Taxa     Neomphaolida   Superorder Vetigastropoda   Superorder Neritaemorphi     Neritopsina   Superorder Caenogastropoda     Architaenioglossa     Sorbeoconcha   Superorder Heterobranchia     Heterostropha     Opisthobranchia     Pulmonata The gastropods, or univalves, are the largest and most successful class of mollusks, with 60,000-75,000 species, and second largest class... The hard, rigid outer calcium carbonate covering of certain animals is called a shell. ... Aperture is the opening in the shell of a gastropod, through which the snail emerges. ... This snapping turtle is trying to make a meal of a Canada goose, but the goose is too wary. ...


The operculum has a concentric structure and a nucleus near the parietal margin (close to the umbilicus).


There are two types of operculum :

  • The first type consists of a thin to rather thick corneous material. This matter is supple, single layered, and circular to subcircular in shape.
  • The second type has a multi-layered structure, with a corneous base and a calcareous overlay which is sometimes carved with spiral structures and grooves.

The operculum sculpture helps us to tell apart and sort related groups (genera) of land operculates.


Pulmonates (lunged snails) lack an operculum, but have instead an epiphragm (a membranaceous or calcareous septum).


Gastropod: external link

  • Pictures of diverse gastropod opercula (http://www.nansaidh.us/operc/index1.html)

This site also provides fairly extensive material on the growth, development, and physiology of the gastropod operculum as well as hundreds of pictures of both the operculum and it's host shell.


Fish

The operculum in fish is the hard bony flap covering the gills. The morphology of this anatomical feature varies greatly between species. For example, the Bluegill (Lepomis macrochirus) has a posteriorly and dorsally orietned rounded extension with a small balck splotch present. In aquatic organisms, gills are a respiratory organ for the extraction of oxygen from water and for the excretion of carbon dioxide. ... Binomial name Lepomis macrochirus Rafinesque, 1819 The bluegill (Lepomis macrochirus) is a species of freshwater fish. ... Binomial name Lepomis macrochirus Rafinesque, 1819 The bluegill (Lepomis macrochirus) is a species of freshwater fish. ...


Botany

  • a flap of the spore-bearing sporangium of a moss, covering the peristome (appendages surrounding the mouth of a moss capsule)
  • the cap of the ascus in certain ascomycetous fungi
  • the covering of a pyxidium (capsule whose upper part falls off when the seeds are released) of a plant, such as the plantain.

A sporangium (pl. ... Subclasses Andreaeidae Sphagnidae Tetraphidae Polytrichidae Buxbaumiidae Bryidae Archidiidae Moss is a type of simple or non-vascular plant, of the class Musci, in the division Bryophyta, that have rhizoids instead of true roots. ... An ascus (plural asci) is the spore-bearing container produced in the ascocarps of ascomycete fungi. ... Classes Archaeascomycetes Hemiascomycetes Euascomycetes Neolectomycetes Pezizomycotina Pneumocystidomycetes Saccharomycotina Schizosaccharomycetes Taphrinomycetes mitosporic Ascomycota Members of the Division Ascomycota are known as the Sac Fungi and are fungi that produce spores in a distinctive type of microscopic sporangium called an ascus (Greek for a bag or wineskin). This monophyletic grouping was formerly...

Brain

The operculum is part of the inferior frontal gyrus of the frontal lobe in the brain. One famous part of the operculum is Broca's area which plays an important role in speech production. Inferior frontal gyrus of the human brain. ... The frontal lobe is an area in the brains of vertebrates. ... In the anatomy of animals, the brain, or encephalon, is the supervisory center of the nervous system. ... Brocas area is the section of the human brain (in the opercular and triangular sections of the inferior frontal gyrus of the frontal lobe of the cortex) which is involved in language processing, speech production and comprehension. ... Conversation can be confused with conservation and vice versa. ...


  Results from FactBites:
 
Operculum - Wikipedia, the free encyclopedia (371 words)
The operculum (plural : opercula or operculums) of gastropods is a corneous plate at the opening of the shell, attached dorsally to the foot.
The operculum in fish is the hard bony flap covering the gills.
The operculum is part of the inferior frontal gyrus of the frontal lobe in the brain.
  More results at FactBites »

 
 

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