Retrocerebral endocrine complex and postcerebral portion of stomatogastric nervous system in lower Brachycera-Orthorrhapha. 1. Rhagionidae and Tabanidae.

摘要

No common features were revealed in the structure of retrocerebral endocrine complexes of Rhagionidae and Nematocera. In Rhagionidae neurohaemal areas are absent in the retrocerebral complex, the corpora cardiaca are paired and arranged close to thesingle transversely extended corpus allatum located above the aorta. The hypocerebral and ventricular ganglia are prominent, there are no connections between the retrocerebral complex and stomatogastric nervous system. In Tabanidae the hypocerebral ganglion is indistinct, the ventricular one is bilaterally subdivided in two. A well-developed neurohaemal area exists behind the brain where an exchange of neurosecretory fibres occurs between the neuroendocrine and stomatogastric systems. The corpora cardiaca are paired and connected with the corpus allatum directly or via the nervi corporis allati. The species looked at were: Rhagio tringarius, R. cingulatus, R. conspicuus, Atylotus fulvus, Tabanus bovinus, T. maculicornis, T. bromius, T. autumnalis, Hybomitra lundbecki, Heptatoma pellucens, Haematopota pluvialis, H. subcylindrica and Chrysops quadratus [C. viduatus].