Subphylum crustacea, Biology

Subphylum Crustacea

Crustacea are mainly aquatic arthropods with gills for respiration. Cephalothorax has usually a carapace; appendages biramous but modified for several functions. Head has a pair of antennules, it pair of mandibles, it pair of antennae, and two pairs of maxillae. Development with a nauplius stage, but this map be not present in higher forms. Crustacea involves arthropods most of that have an aquatic existence. The group abounds in species diversity and biomass.

631_Subphylum Crustacea.png

Figure: A generalised Crustacean

It involves crabs, shrimps, lobsters, crayfish, woodlice etc. even though largely aquatic, there are some semi-terrestrial and terrestrial species. Their success on land is not significant. Let us in brief look into the structural peculiarities of crustaceans. The body of crustaceans is categorized into three regions, head, thorax and abdomen. The head and thoracic segments may be fused to make the cephalothorax. The thorax and abdomen may together form a trunk in some forms. The thoracic segments are covered through a dorsal shield known as carapace. The carapace is a posteriorly directed fold of the body wall of the head and fused along with varying number of segments behind it. Carapace may overhang the sides of the body to some extent or in a few cases it may enclose the whole body.

Posted Date: 2/4/2013 12:07:27 AM | Location : United States







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

Write discussion on Subphylum crustacea
Your posts are moderated
Related Questions
Q What is the constitution of the endocrine system? The endocrine system is constituted by the hormones and the endocrine glands they secrete. Q. What is the histological n

Q. Are hookworms monoxenous or heteroxenous? The Monoxenous are Hookworms that is their life cycle depends only on one host.

Pericardial Valves: Carpentier Edwards (Perimount Valve) :  Pericardium preserved in gluteraldehyde and mounted on flexible stent is available for mitral and aortic positions

BLOO D PRESSURE Is the result of the sum of                 (i) Osmotic colloidal pressure of blood                 (ii) Elastic recoil of blood vessel's wall.

EFFECT ON BODY - 1 .       CANCER - Benzpyrene present in tobacco is carcinogenic , responsible for lung cancer. Tobacoo chewing also produce oral cancer. Smoking m

Define Sex as a determinants of nutrient requirements? There are some differences in requirements between the two sexes. However, except for iron, these are apparent rather tha

How does phosphocreatine act in the muscle contraction and relaxation? Phosphocreatine is the main means of energy storage of the muscle cells. During relaxed periods ATP mo

Zoonotic diseases and trade Disease and trade have a long-standing, interwoven history. During the 14th century, Europeans realized the value of exotic nature of goods and mat

give detail account of modes of locomotion in protozoa and describe various type of asexual reproduction in protozoa

Galvanotaxis - Modes of Cell Movement Galvanotaxis considers to the movement of cells in response to a potential variation between cells. It is suggested that there are voltag