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Die Ultrastruktur der Rektalpapillen vonThrips (Thysanoptera, Terebrantia)

The ultrastructure of the rectal papillae ofThrips (Thysanoptera, Terebrantia)

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Summary

The rectal papillae ofThrips consist of four types of cells arranged as a closed hollow pad. The inner layer is composed of five large primary cells (“Hauptzellen”) and of a drain cell (“Kanalzelle”). The primary cells contain glycogen in form ofβ-granula, and multivesicular bodies. Their apical cell membrane, forming numerous leaflets is associated with mitochondria and with a coat of repeating subunits on the cytoplasmic surface. The lateral plasma membrane of the primary cells has a sinuous course and is in close contact with numerous mitochondria. The intercellular spaces of the primary cell complex are drained to the central cavity of the papilla by a discharge formed by a curved elephant's trunk-like process of the drain cell. The outer layer of the papilla consists of an inner and an outer secondary cell (“Nebenzellen”). Their differentiations related to fluid transport are evident, but generally less elaborate. An open communication of the lumen of the papilla with the haemocoel was not detected. The papilla is connected with the rest of the rectal epithelium by junctional cells (“Verbindungszellen”). Neurosecretory terminals are present at the base of the papillae. The possible ways of fluid transport are discussed and the structure of theThrips papilla is compared with that in other insects.

Zusammenfassung

Die Rektalpapillen vonThrips bestehen aus vier Typen von Zellen, die eine polsterförmige Aufwölbung mit einem abgeschlossenen Hohlraum bilden. Die innere Zellschicht besteht aus fünf großen Hauptzellen und einer Kanalzelle. Die Hauptzellen enthalten Glykogen in Form vonβ-Granula und multivesikuläre Körper. Ihre apikale Zellmembran bildet einen Faltensaum mit einem regelmäßigen Partikelbesatz auf der Innenseite und angelagerten Mitochondrien. Die laterale Plasmamembran der Hauptzellen hat einen gewundenen Verlauf und steht in engem Kontakt zu zahlreichen Mitochondrien. Die Flüssigkeit in den Interzellularräumen des Hauptzellkomplexes wird über einen Kanal zum zentralen Hohlraum der Papille abgeleitet; er wird von einem gebogenen rüsselförmigen Fortsatz der Kanalzellen gebildet. Die äußere Schicht der Papille besteht aus einer inneren und einer äußeren Nebenzelle. Ihre Differenzierungen zum Flüssigkeitstransport sind deutlich, aber allgemein weniger hoch entwickelt. Eine offene Verbindung vom Lumen der Papille zum Haemocoel wurde nicht gefunden. Verbindungszellen bilden den Übergang von der Papille zum übrigen Rektalepithel. Axonendigungen mit Neurosekret liegen an der Papillenbasis. Die möglichen Wege des Flüssigkeitstransports werden diskutiert, und der Aufbau derThrips-Papillen wird mit dem bei anderen Insekten verglichen.

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Bode, W. Die Ultrastruktur der Rektalpapillen vonThrips (Thysanoptera, Terebrantia). Zoomorphologie 86, 251–270 (1977). https://doi.org/10.1007/BF00993668

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  • DOI: https://doi.org/10.1007/BF00993668

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