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Ultrastructure of hepatopancreas and its possible role as a hematopoietic organ in non-marine cypridoidean ostracods (Crustacea)

  • Radka Symonová
Part of the Developments in Hydrobiology book series (DIHY, volume 197)

Abstract

The arrangement of hepatopancreas and associated cells was examined in freshwater cypridoidean ostracods in the context of comparative microanatomy and cytology using light (LM) and transmission electron microscopy (TEM).

A compact, short, subpyriform hepatopancreas located at the sides of the front part of the fore gut has been observed in the following species of the family Candonidae: Candona candida, C. neglecta, Cyclocypris ovum, Cypria ophtalmica, Fabaeformiscandona fabaeformis, Pseudocandona compressa. Within the families Cyprididae (in species Cypridopsis vidua, Herpetocypris reptans, Heterocypris incongruens, Potamocypris unicaudata and Psychrodromus olivaceus), Ilyocyprididae (Ilyocypris gibba) and Notodromadidae (Notodromas monacha, N. persica) a completely different arrangement of the hepatopancreas was observed. In these families the hepatopancreas is tubular and remarkably elongated. Hepatopancreatic cells (sometimes very large) are scattered within a more or less developed layer of other cell types. This organ is also connected to the fore gut. However, it stretches, in comparison with the candonids, much further in the rear part of the body cavity and in the interlamellar space. In transversal and longitudinal sections this organ forms typical lacunae. The lacunae are often longitudinally further subdivided forming a lacunary system. It means that there are often distinct constrictions in some parts of the tubular hepatopancreas. The hepatopancreas verges into multilayer cellular formations (MCFs) in caudal and more peripheral areas. The MCFs can occupy large spaces in the periphery of the body cavity, within the bases of appendages or in the interlamellar space. The morphology of the hepatopancreatic cells in the part close to the fore gut distinctly differs in appearance from the cells in the more caudal areas. The cells in the MCFs strongly resemble “Subdermalzellen” in earlier literature. The development of MCFs often reflects the amount of food in the both parts of the middle gut. The extent and spatial arrangement of the MCF is subject to a high variability. In TEM the hepatopancreatic cells resemble oenocytoid cells described for example in insects. The ultrastructure of some parts of the hepatopancreas viewed in TEM represents typical cecal cells forming a basal labyrinth and microvilli. These specialized cells most probably originate from the hepatopancreatic cells, which are also able to give rise to plasmatocytes.

Keywords

Hepatopancreas Gastric ceca Hemocytic cells Hematopoietic organ 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Radka Symonová
    • 1
  1. 1.Department Biologie II - Anthropologie und HumangenetikLudwig-Maximilians-Universität MünchenPlanegg-MartinsriedGermany

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