Further Ultrastructural Studies on the Encapsulated Larva ofKronborgia isopodicola(Platyhelminthes, Fecampiidae), with Particular Reference to Nuclei
作者:
J. B. Williams,
期刊:
Acta Zoologica
(WILEY Available online 1995)
卷期:
Volume 76,
issue 1
页码: 35-43
ISSN:0001-7272
年代: 1995
DOI:10.1111/j.1463-6395.1995.tb00980.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
AbstractDuring development of the encapsulatedKronborgia isopodicolalarva, nuclei of the body tissues and differentiating eyes undergo a continuous condensation, the progression of which is described. The brain is composed of a central neuropil and an outer layer of nerve cell perikarya. Neurosecretory cells are located at the sides of the brain. Some neurosecretory cell extensions are interposed between the cerebral neuropil and nerve cell perikarya; others overlie the photoreceptor cell processes of the eyes. The advanced encapsulated larva possesses a frontal complex, consisting of modified epidermis, secretory cells, gland ducts and nerve cell processes. The advanced larva is transparent and diminished in size, advantages possibly due in part to the extraordinary process of comprehensive nuclear condensation during ontogeny. The larva has a uniform epidermal ciliation and, while sharing certain features with trochophore larvae, is not of the trochophore type.
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