Summary
In larval Aeshna cyanea the anterior portion of the rectum has been modified into a branchial chamber with six gill folds (corresponding to the pads in the posterior rectal portion). A gill fold is made up of a longitudinal main fold with obliquely placed transverse folds at each side. Each transverse fold consists of two basal pads enclosing fat body cells. The cells of the basal pads show some details reminiscent of transporting epithelia (e.g. apical and basal infoldings, numerous mitochondria). The apical parts of the pads are constricted into lamellae projecting into the rectal lumen. These lamellae are typical respiratory epithelia, which consist of two very flat layers with extracellular tracheoles arranged in invaginations of the basal plasma membrane just beneath the cuticle. Thus it may be assumed that this part of the rectum is concerned with respiration as well as absorption of ions.
Zusammenfassung
Ein großer Teil des Rectums der Larven von Aeshna cyanea wird von der Kiemenkammer eingenommen. Hier ist das Epithel im Bereich der Kiemenstreifen modifiziert. Ein Kiemenstreifen besteht aus Haupt- und Querfalten. Basale Teile der Querfalten (Basalwülste) werden von Zellen gebildet, die morphologisch einem transportaktiven Epithel ähneln (unter der Cuticula apikaler Mikroleistensaum mit zahlreichen Mitochondrien, basales Labyrinth). Die aus zwei Basalwülsten hervorgehenden Kiemenblättchen, locker aufeinanderliegende, einschichtige Epithelien, zeigen Strukturmerkmale respiratorischer Epithelien (niedrige Zellen, reiche Tracheen- und Tracheolenversorgung in Invaginationen der basalen Plasmamembran, die bis nahe unter die Cuticula reichen). Man darf daher annehmen, daß diesem Enddarmabschnitt neben der Respiration auch ionentransportierende Tätigkeit zukommt.
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Abbreviations
- äE:
-
äußere Epicuticula
- Bl:
-
Basallamelle
- Bw:
-
Basalwulst
- Cu:
-
Cuticula
- cM:
-
circuläre Muskulatur
- Dl:
-
Darmlumen
- En:
-
Endocuticula
- Fk:
-
Fettkörper
- Gl:
-
Glykogen
- hC:
-
homogene Cuticula
- Hc:
-
Hämocoel
- Hf:
-
Hauptfalte
- iE:
-
innere Epicuticula (=dense layer)
- Kb:
-
Kiemenblättchen
- Ks:
-
Kiemenstreifen
- Mi:
-
Mitchondrium
- Mt:
-
Mikrotubuli
- Mu:
-
Muskeln
- Mvb:
-
Multivesikularörper
- N:
-
Kern
- Pi:
-
Pigmentgranum
- Qf:
-
Querfalte
- Re:
-
Rectumepithel
- RER:
-
rauhes endoplasmatisches Reticulum
- sL:
-
subcuticulare Lage
- TR:
-
Trachee
- Tr:
-
Tracheole
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Herrn Professor Dr. R. Altevogt, Münster, zum 50. Geburtstag gewidmet.
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Greven, H., Rudolph, R. Histologie und feinstruktur der larvalen kiemenkammer von Aeshna cyanea Müller (Odonata: Anisoptera). Z. Morph. Tiere 76, 209–226 (1973). https://doi.org/10.1007/BF00298622
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DOI: https://doi.org/10.1007/BF00298622