Martín-Vega D, Garbout A, Ahmed F, Ferrer L M, Lucientes J, Colwell D D, Hall M J R
Department of Life Sciences, Natural History Museum, London, U.K.
Department of Life Sciences, University of Alcalá, Alcalá de Henares, Spain.
Med Vet Entomol. 2018 Sep;32(3):378-382. doi: 10.1111/mve.12301. Epub 2018 Feb 16.
Oestrid flies (Diptera: Oestridae) do not feed during the adult stage as they acquire all necessary nutrients during the parasitic larval stage. The adult mouthparts and digestive tract are therefore frequently vestigial; however, morphological data on the alimentary canal in adult oestrid flies are scarce and a proper visualization of this organ system within the adult body is lacking. The present work visualizes the morphology of the alimentary canal in adults of two oestrid species, Oestrus ovis L. and Hypoderma lineatum (de Villiers), with the use of non-invasive micro-computed tomography (micro-CT) and compares it with the highly developed alimentary canal of the blow fly Calliphora vicina Robineau-Desvoidy (Diptera: Calliphoridae). Both O. ovis and H. lineatum adults showed significant reductions of the cardia and the diameter of the digestive tract, an absence of the helicoidal portion of the midgut typical of other cyclorrhaphous flies, and a lack of crop and salivary glands. Given the current interest in the alimentary canal in adult dipterans in biomedical and developmental biology studies, further understanding of the morphology and development of this organ system in adult oestrids may provide valuable new insights in several areas of research.
狂蝇（双翅目：狂蝇科）成虫阶段不进食，因为它们在寄生幼虫阶段获取了所有必需的营养物质。因此，成虫的口器和消化道常常退化；然而，关于成年狂蝇消化道的形态学数据很少，并且缺乏对成虫体内这个器官系统的恰当可视化呈现。本研究利用非侵入性微计算机断层扫描（显微CT）对两种狂蝇，即羊狂蝇（Oestrus ovis L.）和纹皮蝇（Hypoderma lineatum (de Villiers)）成虫的消化道形态进行了可视化，并将其与丽蝇（Calliphora vicina Robineau-Desvoidy，双翅目：丽蝇科）高度发达的消化道进行了比较。羊狂蝇和纹皮蝇成虫均表现出贲门和消化道直径显著减小，缺乏其他环裂亚目蝇类典型的中肠螺旋部分，且没有嗉囊和唾液腺。鉴于目前在生物医学和发育生物学研究中对成年双翅目昆虫消化道的关注，进一步了解成年狂蝇这个器官系统的形态和发育可能会在多个研究领域提供有价值的新见解。
