Class of crustacea - malacostraca, Biology

Class of Crustacea - Malacostraca

Malacostraca involves most of the larger forms such as crabs, lobsters, shrimps etc. and constitute the majority of crustacean species. The cephalic region is formed by using the fusion of five segments; the trunk region contains five thoracic and six abdominal segments. Additionally, a postabdominal telson forms part of the tail fin. A carapace that is covering the thorax may or may not be present. The thoracic appendages called pereopods or walking legs have well developed endopodite employed for crawling and prehension. The thoracic legs have gills, generally modified epipodites. In many malacostracans, first pair of thoracic appendages are modified into maxillipeds employed for feeding. The first five pairs of abdominal appendages called pleopods are the swimming legs. Besides swimming, they may also be used for burrowing carrying eggs in females and frequently for gas exchange. In males the first pair of abdominal appendages are changed as copulatory organs.

Posted Date: 2/4/2013 12:14:49 AM | Location : United States







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

Write discussion on Class of crustacea - malacostraca
Your posts are moderated
Related Questions
Q. What are the stages of mitosis? Mitosis involves replication of DNA and its separation into two new daughter cells. Whereas only four phases of mitosis are often listed. Ent

A few statements about the mechanism of evolution are made. Mark the correct statements.   (i)  Evolution happens at the individual level as well as population level. (ii

Dietitians and nutritionists Dietitians and nutritionists, who are associated with hospitals and clinics generally have regular work hours. At times, they may be required to wo

what are the origin, morphology, active constituents, uses and market preparation of tanco beans ?

Explain the Metabolic Aberrations of Underweight? When energy intake falls below the minimal requirements, the body responds with an orderly physiologic adaptation involving th

Peculiarities of Mitosis - Cleavage From the following you will learn that the mitosis in the phase of cleavage has some striking peculiarities: a) Synchronization of cell

Routine blood tests like haemoglobin, creatinine, electrolytes are useful to plan treatment. More recently the blood natriuretic peptide levels have been used to assess heart failu

Classification of Protozoa Traditionally, protozoans have been classified as flagellates, amoebae, sporozoans and ciliates. We have retained this broad grouping for convenienc

Define Nutritional Requirements of Fats and Oils for Adults? A desirable amount of a linoleic acid to be consumed by a normal adult is 3 en% (ICMR, 1990). The invisible fat pre

HEAR T - The cells called cardiocytes of atria of the heart secrete peptide hormone called atrial natriuretic factor (ANF) in response of an increased return of the deoxygen