Summary
The structure of the cuticle in the four species of the family Hesionidae(Microphthalmus cf.listensis, M. cf.similis, Hesionides arenaria, juv.Podarke spec.) investigated basically corresponds to that found in all annelids. It consists of an outer, electron dense layer, epicuticle, basal cuticle with a fibrous layer, and numerous microvilli which penetrate the layers and are covered by a more or less dense glycocalyx. However, a rough collagen grid is not developed, the fibers are much thinner and are arranged in a more irregular manner. This corresponds to structures found in archiannelids and polychaete larvae. We consider them here to be reductions of the typical polychaete cuticle and postulate a correlation to the small body size of the species investigated. The quantitative differences in cuticle dimensions in the various body regions and structures can also be explained on a purely functional basis, especially apparent in the comparison of prostomium and body trunk. The pharynx cuticle shows significant structural differences due to the development of an additional peripherical lamellar layer-known to this extent only in gastrotrichs—as well as differently shaped and unusually long microvilli. This character is discussed as a possible synapomorphy for the family Hesionidae.
Zusammenfassung
Der Aufbau der Kutikula der 4 untersuchten Species aus der Familie Hesionidae(Microphthalmus cf.listensis, M. cf.similis, Hesionides arenaria, juv.Podarke spec.) entspricht grundsätzlich den Verhältnissen bei allen Anneliden: äußere elektronendichte Schicht, Epikutikula, basale Kutikula mit Faserschicht und zahlreiche Mikrovilli, die diese Schichten durchbrechen und von einem mehr oder weniger dichten Glykokalyx bedeckt sind. Ein derbes Kollagengitter ist jedoch nicht ausgebildet; die Fibrillen der Faserschicht sind wesentlich feiner und unregelmäßiger angeordnet. Dies entspricht Strukturen, wie sie bei Archianneliden und bei Polychaetenlarven gefunden werden. Wir deuten sie hier als Reduktionen der typischen Poly chaetenkutikula und vermuten eine Beziehung zur geringen Körpergröße der untersuchten Arten. Rein funktionell lassen sich auch die quantitativen Unterschiede in den verschiedenen Bereichen der Körperoberfläche deuten, die besonders im Vergleich von Prostomium und Rumpf zum Ausdruck kommen. Die Pharynxkutikula zeigt starke strukturelle Abweichungen durch die Ausbildung einer zusätzlichen peripheren Lamellenschicht (in diesem Ausmaß nur von den Gastrotrichen bekannt) und abweichend geformter, besonders langer Mikrovilli. Dieses Merkmal wird als mögliche Synapomorphie für die Familie Hesionidae diskutiert.
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Westheide, W., Rieger, R.M. Cuticle ultrastructure of Hesionid polychaetes (Annelida). Zoomorphologie 91, 1–18 (1978). https://doi.org/10.1007/BF00994150
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DOI: https://doi.org/10.1007/BF00994150