Barnacle: Difference between revisions

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There are several parts that make up a barnacle.  The outermost layer of a barnacle is its shell.  The shell of the adult barnacle is usually composed of four to eight Calcereous plates which form a shape that resembles a triangle with a hole at the top.[http://www.mesa.edu.au/friends/seashores/barnacles.html] This hole is also covered by two calcereous plates which can pull back to reveal the inside of the barnacle.[http://museumvictoria.com.au/crust/barnbiol.html]  These plates will grow and expand by adding more material to itself.
There are several parts that make up a barnacle.  The outermost layer of a barnacle is its shell.  The shell of the adult barnacle is usually composed of four to eight Calcereous plates which form a shape that resembles a triangle with a hole at the top.[http://www.mesa.edu.au/friends/seashores/barnacles.html] This hole is also covered by two calcereous plates which can pull back to reveal the inside of the barnacle.[http://museumvictoria.com.au/crust/barnbiol.html]  These plates will grow and expand by adding more material to itself.
[http://en.wikipedia.org/wiki/Barnacle]
[http://en.wikipedia.org/wiki/Barnacle]
These plates are operated by several sets of muscles.  The scutal depressor muscles, the scutal abductor muscle, and the tergal depressor muscle are used to open and close the two plates that cover the opening to the barnacle .[http://webs.lander.edu/rsfox/invertebrates/balanus.html]  
These plates are operated by several sets of muscles.  The scutal depressor muscles, the scutal abductor muscle, and the tergal depressor muscle are used to open and close the two plates that cover the opening to the barnacle.[http://webs.lander.edu/rsfox/invertebrates/balanus.html]  


Immediately inside the Barnacle are six legs that are used for three purposes.  These legs or cirri are usually formed in a feather like shape and have tiny sensory hairs called setae that cover the cirri.[http://invertebrates.si.edu/crustaceans.htm] These legs are used for filter feeding, are the main source of response, and they are used for respiration in class cirripedia.[http://www.waterencyclopedia.com/Ce-Cr/Crustaceans.html]  When used for feeding the legs are extended into the water by the barnacle in order to catch whatever food it can.  The legs are then retracted and whatever particles the legs have caught are brought to the mouth..[http://invertebrates.si.edu/crustaceans.htm]  They are also used as the sensory organs of the Barnacle.  The tiny sensory hairs on the cirri detect danger and water level in order to tell the creature whether to open or close the two calcereous plates at the top [http://www.cb1.com/~john/research/barnacle.html]
Immediately inside the Barnacle are six legs that are used for three purposes.  These legs or cirri are usually formed in a feather like shape and have tiny sensory hairs called setae that cover the cirri.[http://invertebrates.si.edu/crustaceans.htm] These legs are used for filter feeding, are the main source of response, and they are used for respiration in class cirripedia.[http://www.waterencyclopedia.com/Ce-Cr/Crustaceans.html]  When used for feeding the legs are extended into the water by the barnacle in order to catch whatever food it can.  The legs are then retracted and whatever particles the legs have caught are brought to the mouth..[http://invertebrates.si.edu/crustaceans.htm]  They are also used as the sensory organs of the Barnacle.  The tiny sensory hairs on the cirri detect danger and water level in order to tell the creature whether to open or close the two calcereous plates at the top [http://www.cb1.com/~john/research/barnacle.html]
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The life process of a barnacle consists of three stages.  The nauplius, the cyprid, and the adult stage.[http://www.absoluteastronomy.com/topics/Barnacle#encyclopedia]
The life process of a barnacle consists of three stages.  The nauplius, the cyprid, and the adult stage.[http://www.absoluteastronomy.com/topics/Barnacle#encyclopedia]
The first step of the process is fertilization.  The barnacle will release sperm into the ocean through its penis.  The sperm will travel until another barnacle consumes the sperm.  When the sperm reaches another barnacle it is delivered to the mantle cavity to fertilize the eggs that are stored there.
The first step of the process is fertilization.  The barnacle will release sperm into the ocean through its penis.  The sperm will travel until another barnacle consumes the sperm.  When the sperm reaches another barnacle it is delivered to the mantle cavity to fertilize the eggs that are stored there.[http://webs.lander.edu/rsfox/invertebrates/balanus.html]


The eggs will hatch as a nauplius: small larval creatures with one eye, two antennae, and several mandibles. [http://webs.lander.edu/rsfox/invertebrates/balanus.html] The nauplius will usually molt six times before it morphs into the next stage.  It usually moults once before it is released from the mantle cavity and into the open ocean.  [http://www.absoluteastronomy.com/topics/Barnacle#encyclopedia]
The eggs will hatch as a nauplius: small larval creatures with one eye, two antennae, and several mandibles. [http://webs.lander.edu/rsfox/invertebrates/balanus.html] The nauplius will usually molt six times before it morphs into the next stage.  It usually moults once before it is released from the mantle cavity and into the open ocean.  [http://www.absoluteastronomy.com/topics/Barnacle#encyclopedia]
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* [http://en.wikipedia.org/wiki/Barnacle] author, publisher, date.
* [http://en.wikipedia.org/wiki/Barnacle] author, publisher, date.
* [http://invertebrates.si.edu/crustaceans.htm] author, publisher, date.
* [http://invertebrates.si.edu/crustaceans.htm] author, publisher, date.
* [http://www.waterencyclopedia.com/Ce-Cr/Crustaceans.html]
* [http://webs.lander.edu/rsfox/invertebrates/balanus.html]
* [http://www.cb1.com/~john/research/barnacle.html]
* [http://museumvictoria.com.au/discoverycentre/infosheets/how-do-barnacles-cement-themselves-to-rocks/]
* [http://www.infoplease.com/ce6/sci/A0856850.html] 
* [http://www.absoluteastronomy.com/topics/Barnacle#encyclopedia]
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