Class pycnogonida of phylum arthropoda, Biology

Class Pycnogonida of Phylum Arthropoda

Measures generally 3-4 mm; body chiefly made up of cephalothorax, abdomen being very small; generally four pairs of walking legs; long proboscis along with a mouth simple eyes, four in number; no excretory or respiratory organs. - These are generally known as sea spiders occur in all the seas. The narrow body is made up of a number of distinct segments. Prosoma (cephalothorax is the prominent region of the body and opisthosoma (abdomen) is much reduced. The head or cephalon bears four simple eyes mounted on the dorsal surface on a tubercle and a cylindrical proboscis. It as well bears a pair of comparatively small chelicerae and palps each. The trunk is formed of four cylindrical segments, of which the first one is fused along with the head. From each of the four segments, a pair of lateral processes project out to which the long walking legs are articulated. The legs are eight segmented and are generally much longer than the body. The abdomen appears as a short conical process.

Posted Date: 2/2/2013 1:12:02 AM | Location : United States







Related Discussions:- Class pycnogonida of phylum arthropoda, Assignment Help, Ask Question on Class pycnogonida of phylum arthropoda, Get Answer, Expert's Help, Class pycnogonida of phylum arthropoda Discussions

Write discussion on Class pycnogonida of phylum arthropoda
Your posts are moderated
Related Questions

Electro magnetic radiation Light is one form of energy. The light rays consist of tiny particles called photons. The energy carried by photon is called quantum. Light

Q. Symptoms of Angina Pectoris? The pain of angina is usually over the center of the chest (below the sternum) but can be felt from epigastrum to the jaw and arms. It is brough

Define Nutrition Screening Initiative (NSI)? (NSI) tries to identify basic risk factors - inappropriate food intake, poverty, social isolation, disability, acute / chronic dise

Explain the term Chemical Score? Since egg proteins contain all essential amino acids in adequate amounts and possess the highest nutritive value among dietary proteins, Block

PITUITARY GLAND (HYPOPHYSIS CEREBRI) - It develops from ectoderm of the embryo. The pituitary gland is located just below the hypothalamus. The pituitary gland is situate

Ribonucleases  and  deoxyribonucleases These enzymes  are  responsible  for  the degradation of  dietary  nucleic acids. Ribonucleases  and  deoxyribonucleases secreted by  the

Explain the Economics in Nutrition? We mentioned earlier that nutritional problems affect the productivity of the individual, which, in turn affects the productivity of the nat

Which organs are protected by (a) the skull, (b) the rib cage, (c) the vertebrae?   a) The skull safe the brain, b) the rib cage safes the heart, lungs, liver and spleen,

In the hybridization of 2 genes (4 different alleles, 2 of each pair) how does epistasis affect the proportion of phenotypical forms in the F2 generation? In the dihybridism wi