Reproductive system of asteroidea, Biology

Reproductive System of Asteroidea

Sexes are separate in several asteroids. There are ten (10) gonads, two in each arm. They emerge tuft-like or as cluster of grapes. Mature gonads occupy approximately to the entire arm. The gonopore is located between the bases of the arms. In the majority of sea stars the sperms and eggs are shed into sea water and fertilisation is external. A single female might shed as many as 2.5 million eggs. Development involves a larval stage - the bipinnaria larva. The free swimming larva is provided with ciliary bands and arms which function in both locomotion and feeding. The bipinnaria larva then transforms into another larva, the brachiolaria larva along with the appearance of additional arms at the anterior end. The branchiolaria as compared to metamorphoses into an adult.

Posted Date: 2/4/2013 1:22:11 AM | Location : United States







Related Discussions:- Reproductive system of asteroidea, Assignment Help, Ask Question on Reproductive system of asteroidea, Get Answer, Expert's Help, Reproductive system of asteroidea Discussions

Write discussion on Reproductive system of asteroidea
Your posts are moderated
Related Questions
Q What is the intracellular digestion? Cellular digestion or Intracellular digestion is the breaking in the interior of the cell of big molecules coming from outside or even fr

What are the advancement of cnidaria over protozoa

We are told that every surface we touch is teeming with bacterial cells, and bacteria are found in the pools we swim in, the water we wash with, and on the hands of friends. Why ar

Q. Demonstration of tremendous diversity? A objective of taxonomy is the assemblage of knowledge gained. This is usually in the form of treatises useful to fellow scientists an

HEREDITY 1.         Like begets like i.e; every living organism reproduces its own kind. Frog reproduce frogs, rats reproduce rats only. 2.         Heredity includes the cha

What are the classes into which the phylum Arthropoda is divided? What are the three main ones and some of their representative species? The three major classes of arthropods a

Q. What is the etiological agent of amebiasis? How it transmitted and what are the typical manifestations of the disease? The Amebiasis is caused by the protozoan Entamoeba his

Explain about Osteogenesis Osteogenesis, large amounts of woven bone can be formed very rapidly. This bone is believed to be much more compliant than organized lamellar bone. I

All plants and animals have a natural microflora associated with them. For example, the plants have a natural microflora associated with the surface of roots, stems, leaves e

INTERNA L EAR - It is called membranous labyrinth protected by bonny labyrinth of periotic bone (Frontal, Temporal and  Parietal). Between internal ear and bonny la