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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

GONGORA-LANDEROS, Elizabeth; URIA-GALICIA, Esther A; MARTINEZ-JERONIMO, Felipe Fernando  and  LOPEZ-VILLEGAS, Edgar Oliver. Histological Description of the Brood-chamber of Moina hutchinsoni (Brem, 1937). Int. J. Morphol. [online]. 2010, vol.28, n.4, pp.1025-1030. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022010000400007.

Cladocerans are parthenogenetic during the greater part of the year. Populations consist entirely of females that reproduce asexually; in these females the ovary communicates through an oviduct with the brood chamber which is located at the rear inner shell border, near the heart and before the intestine. The eggs originating from the oviducts are deposited in the brood chamber and are incubated until the end of embryonic development. Moina is considered post embryonic development because juvenile or neonate organisms emerge fully formed and independent during moulting. In asexual reproduction the brood chamber contains the various stages of embryonic development denominated, oocyte, egg and embryo. At this stage the sexual gamogenetic contains an ephippium with two eggs. The brood chamber is formed histologically by a simple, plane epithelium that rests on a clear basal membrane continuous with the loose connective tissue, after which the shell can be located. Inside the brood chamber oocytes, eggs and some stages of embryonic development are identified, as well as fine semi optical and transmission microscopy cuts respectively.

Keywords : Moina hutchinsoni; Ultrastructure; Brood chamber; Epifio; Embryonic development.

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