Sentence:  The <WSD>spermatophores</WSD> begin to ejaculate immediately after leaving the penis and the whole process is completed in a very few seconds. Pulling the filament attached to the ejaculatory end of a <WSD>spermatophore</WSD> is all that is needed to start its ejaculation. 
Meaning of the word marked with <WSD> tags:  A capsule or pocket enclosing a number of spermatozoa, found in many annelids, brachiopods, mollusks, and crustaceans.