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1 December 2007 Body Colors and Algal Distribution in the Acoel Flatworm Convolutriloba longifissura: Histology and Ultrastructure
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Abstract

Convolutriloba longifissura is a red flatworm with white dots that harbors unicellular green algae within its body. The red pigment of the flatworm that is present in round cells is soluble in ethanol or acetone, whereas the white pigment contained in the crystalline (retractile) platelets of amoeboid-shaped cells is soluble in 1% NH4OH. These two types of pigment cells form the body coloration and are probably involved in light protection of the algal symbionts, as many algal cells are distributed beneath the body wall and some are in the highly vacuolated parenchyma. The ultrastructural features of these cells suggest a close relationship with Tetraselmis spp. The morphology of sagittocysts within the mantle is also described by means of scanning and transmission electron microscopy.

Euichi Hirose and Mamiko Hirose "Body Colors and Algal Distribution in the Acoel Flatworm Convolutriloba longifissura: Histology and Ultrastructure," Zoological Science 24(12), 1241-1246, (1 December 2007). https://doi.org/10.2108/zsj.24.1241
Received: 3 June 2007; Accepted: 1 August 2007; Published: 1 December 2007
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