(Last Updated on : 26-08-2014)
are closely allied to water-fleas and copepods and when young are free-swimming with three pairs of appendages. While still free-swimming they develop additional limbs, feed, moult and change their forms. Later they attach themselves by their first pair of antennae to rocks or timber and after a resting stage become shelled adults. The shell is in divisions which overlap and when closed are thoroughly protective. A barnacle is therefore described as a kind of shrimp standing on its head, attached to some support and with its legs projecting upwards. These legs serve to produce currents in water enabling the animal to respire and capture food.
There are two kinds of barnacles - stalked or Goose barnacles and unstalked or Acorn barnacles. Lepas is an example of the former and Balanus of the latter and both the kinds of barnacles when adults, measure three to five centimetres across. Barnacles are so abundant and so widely distributed that all rocks on the littoral, pilings, shelled animals like molluscs and crabs, the keels and hulls of ships and canoes are all encrusted by these crustaceans. In the Goose barnacles, found in clusters on logs of driftwood or on the hulls of ships after long voyages, their fleshy stalks grow from 2.5 centimetres to more than thirty centimetres long.
This article is a stub. You can enrich by adding more information to it. Send your Write Up to firstname.lastname@example.org
Recently Updated Articles in History of India
|• ||Vijayanagar Empire|
Vijayanagar Empire is also known as the Kingdom of Bisnegar. This name was given by the Portuguese. Vijayanagar empire includes the Sangama Dynasty, Saluva Dynasty, Tuluva Dynasty and the Aravidu Dynasty.
Anegondi, dramatic location and awesome architure with an out of the ordinary past this little village in Karnataka has
|• ||Foundation of the Gupta Empire in India|
Consolidating the entire northern India, the early Gupta rulers had founded the stronghold of the Gupta Dynasty in India
Walis or Sufi Saints are those who have established a connection with the universal consciousness. They are closely connected to God to the extent that some of them remain cut-off from the real physical world as in the case of the condition of Wilayat Awwal. There are different levels of Wali depending on the extent of love and unity with the Almighty that they feel and exhibit in their behaviour.
|• ||Village Administration of Rashtrakuta Empire|
Village administration of Rashtrakuta Empire was headed by the village headman. Villages were divided for efficient governance.