Fine structure of the reproductive system of <Emphasis Type="Italic">Chrysomya megacephala</Emphasis> (Diptera: Calliphoridae): the external sexual organ |
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Authors: | Tarinee Chaiwong Kom Sukontason Jimmy K Olson Hiromu Kurahashi Udom Chaithong Kabkaew L Sukontason |
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Institution: | (1) Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand;(2) Department of Entomology, Texas A&M University, College Station, TX 77845-2543, USA;(3) Department of Medical Entomology, National Institute of Infectious Diseases, Tokyo 162-8640, Japan |
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Abstract: | The fine structure of the reproductive system of Chrysomya megacephala (Fabricius), a blow fly species of medical importance, was studied using scanning electron microscopy (SEM) to contribute
detailed morphological information on the external sexual organs or genitalia of this species. Analysis of the male genitalia
or hypopygium revealed that the epandrium is a broad organ resembling a crescent shape, while the ejaculatory apodeme and
aedeagal apodeme show similarity in their lengths. The cercus is significantly longer than the surstylus with its apical end
being more or less rounded. Dense patches of long bristles, morphologically similar to the sensilla chaetica and sensilla
trichodea, were found along the lower half of the cercus. The surstylus has a stout triangular shape, and the proximal half
is greatly endowed with sensilla thought to be sensilla chaetica and sensilla trichodea. The aedeagus per se is prominent
and has a clavate shape formed by the base theca and elongated phallus. The vesica of the phallus is a smooth bilobed structure,
which curves inward. The juxta and juxta process are armed with many rows of strong spines resembling thorns in their appearance.
The harpe is slender, recurved anteriorly, and distally pointed like a sickle. Regarding the female genitalia or ovipositor,
SEM observation of the supraanal plate revealed it to be sclerotized and more or less triangular-shaped, lying between a pair
of short cerci. Several types of sensilla were found on the supraanal plate, subanal plate and cercus, including the sensilla
trichodea, sensilla basiconica, sensilla placodea, and probably, sensilla styloconica. The possible functions of sensilla
distributed in particular regions of the fly genitalia are discussed. |
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