. The biology of marine animals. Marine animals; Physiology, Comparative. Fig. (a) Convoluta convoluta and (b) C. roscoffensis, Two Species of ACOELOUS TURBELLARIANS HARBOURING SYMBIOTIC ALGAE (X 27). (From Keeble, 1912.) liver tubules which extend into the cerata (finger-like processes arising from the dorsal surface of the body). These animals prey upon the anemone Heliactis bellis, from which they acquire their zooxanthellae (37). Other sea-slugs which feed upon anemones and contain zooxanthellae probably obtain them from the same source. In Tridachia crispata, which is a herbivore,
. The biology of marine animals. Marine animals; Physiology, Comparative. Fig. (a) Convoluta convoluta and (b) C. roscoffensis, Two Species of ACOELOUS TURBELLARIANS HARBOURING SYMBIOTIC ALGAE (X 27). (From Keeble, 1912.) liver tubules which extend into the cerata (finger-like processes arising from the dorsal surface of the body). These animals prey upon the anemone Heliactis bellis, from which they acquire their zooxanthellae (37). Other sea-slugs which feed upon anemones and contain zooxanthellae probably obtain them from the same source. In Tridachia crispata, which is a herbivore, the zooxanthellae lie in connective tissue and are localized in a band lying near the margin of the highly flattened body. The pelagic form Phyllirrhoe also harbours zooxanthellae in liver diverticula. Zooch- lorellae in Placobranchus occur in folds of the branchial cavity, and in the liver where they may be undergoing digestion (12, 52, 111). Symbiosis with algae is highly developed among the Tridacnidae occurring on coral reefs of the Indo-Pacific region (Fig. ). Two. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nicol, J. A. Colin (Joseph Arthur Colin), 1915-. New York, Interscience Publishers
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