The spermalege has two embryologically distinct parts, known as the ectospermalege and mesospermalege.
The ectospermalege is derived from the ectoderm. It consists of a groove in the right-handed posterior margin of the fifth sclerite, overlying a pleural membrane. In order to access the female's haemocoel during traumatic insemination, male bed bugs insert their needle-like penis into the groove, and pierce the pleural membrane. This piercing produces wounds that leave melanised scars.
The mesospermalege is derived from the mesoderm. It is a membrane-bound sac attached to the wall of the haemocoel, directly beneath the groove of the ectospermalege. In all bed bug species except Primicimex cavernis, sperm are injected into the mesospermalege. The structure contains two main types of hemocyte, though their function is not yet fully understood. The first of these is phagocytic and may absorb seminal fluid, whereas the other may digest spermatozoa.
Read more about this topic: Spermalege
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Famous quotes containing the word structure:
“If rightly made, a boat would be a sort of amphibious animal, a creature of two elements, related by one half its structure to some swift and shapely fish, and by the other to some strong-winged and graceful bird.”
—Henry David Thoreau (18171862)
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“There is no such thing as a language, not if a language is anything like what many philosophers and linguists have supposed. There is therefore no such thing to be learned, mastered, or born with. We must give up the idea of a clearly defined shared structure which language-users acquire and then apply to cases.”
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