Spermatophores, Biology


Many non-chordates do not release free sperms during copulation. They have a mechanism to bundle and enclose a number of sperms in a sheath usually made of gelatinous material. Such bodies are called spermatophores. Most insects, the centipedes and certain molluscs produce spermatophores. Male centipede emits spermatophores and places it on a web already made. The female picks up the spermatophores and takes it into her genital opening. In many male cephalopods such as Loligo and Argonauta one of the arms gets specialised for the transfer of spermatophore into the females. Such an arm is called hectocotylized arm. The spermatophore, after having been deposited in the female, finally releases the sperms which move into the female ducts or the spermathaca.

Posted Date: 2/5/2013 1:20:42 AM | Location : United States

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

Write discussion on Spermatophores
Your posts are moderated
Related Questions
Determine the appearance of a plant cell when water is plentiful? When water is plentiful, the central vacuole expands. The other organelles are pushed against the plasma me

Your breakfast consists of a cup of black coffee with sugar as well as a plain bagel covered with cream cheese. Describe the digestion of this breakfast as it passes through each m

What is the typical biological function of the connective tissues? How is this function associated to the main features of its cells? The typical function of the connective tis

This means the non-market value of natural products such as firewood, game and fodder that do not pass through a market or product preparation. Indigenous people in developing cou

Treatment of diarrhea Loperamide (Imodium, and others), an over-the-counter synthetic opioid (4-mg loading dose, then 2 mg orally after each loose stool to a maximum of 16 mg/d

Q How many germ layers originate the body of platyhelminthes? In relation to this characteristic how are these animals classified? Platyhelminthes are the first triploblastic a

TYPES OF PARTHENOGENESIS - 1 .      NATURAL PARTHENOGENESIS - In many animals natural parthenogenesis is common process & is a method of reproduction. It is of two typ

Ciliated Protozoan Ciliates form the largest and the most homogenous group of protozoans. They are placed under one phylum Ciliophora and evidence indicates that its members s

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

Q. What are the cell movements and how are these movements created? Cell movements are movements executed by cell structures, like the movements of flagella and cilia, the pseu