Class of crustacea - cirripedia, Biology

Class of Crustacea - Cirripedia

These crustaceans are completely marine, and include the barnacles. Moa species are free living, attached to rock, and other objects. Some are commensals living on whales, fish, turtles and other organisms. Some are parasites. Free living forms are either stalked or sessile. The stalked forms (goose barnacles) measure a few mm to 75 cm in length. Sessile types are a few centimeters long. Stalked forms have a muscular, flexible stalk or peduncle which is attached to the substratum at its lower end and has the main parts of the body, the capitulum, at the other end. The peduncle is the preoral end of the animal and bears the vestiges of the larval first antennae and the cement glands. The secretion of the cement gland is adhesive in nature. The capitulum involves the entire body except the preoral parts. The body is covered by a carapace or the mantle. The mantle is covered through five plates: a posterior dorsal plate carina, a pair of terga and a pair of scuta. Sessile barnacles are attached to the substratum by a membranous or calcareous, basis. This forms the preoral region of the animal and consists of cement glands. The animal is surrounded by a wall of plates and within this wall the animal is covered by an operculum formed by movable terga and scuta.

Posted Date: 2/4/2013 12:13:57 AM | Location : United States







Related Discussions:- Class of crustacea - cirripedia, Assignment Help, Ask Question on Class of crustacea - cirripedia, Get Answer, Expert's Help, Class of crustacea - cirripedia Discussions

Write discussion on Class of crustacea - cirripedia
Your posts are moderated
Related Questions
Q. What is the difference between cerebrum and brain? What are the major parts of these structures? The concept of brain or encephalon comprehends the cerebrum mostly referred

Explain the Feeding 6-12 Months Infant? As the infant grows older, mother's milk alone is not sufficient to meet his increasing needs. This could be seen in few infants between

The major factor which controls glycogen metabolism in the liver is the concentration of phorphorylase alpha. Certainly, this enzyme catalyzes the limiting step of glycogen breakdo

Q. Microorganisms on basis of oxygen requirement for growth? On basis of oxygen requirement for growth: - Obligate Aerobes: Require oxygen for growth and multiplication e.g

How are the main classes of arthropods classified according to the presence of larval stage in their embryonic development? In crustaceans there are species with direct and oth

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Q. Imaging Techniques to test stress? A screening exam with M-mode and limited Doppler should be performed at the start of the test, but a detailed echo examination is usually


habitat of protozoa .

Q. What is metabolic disorders? In these metabolic disorders, since there is an inability to metabolize a specific amino acid the basis of dietary management is to restrict the