Biological results of the Snellius expedition. XXIV. Pelagic Tunicates of the Snellius expedition
Eleven samples of pelagic tunicates were found in the material collected during the Snellius Expedition 1929-30. In these, seven species, viz., two pyrosomas and five salpas, are included. In addition, a few old specimens of another species of Pyrosoma were found in the collection of the Leiden Museum. Thus, the following eight species are recorded in the present short paper. 1. Pyrosoma spinosum (Herdman) 2. Pyrosoma verticillatum cylindricum Metcalf & Hopkins 3. Pyrosoma atlanticum atlanticum (Peron) 4. Ritteriella picteti (Apstein) 5. Salpa fusiformis Cuvier 6. ? Salpa cylindrica Cuvier 7. Thetys vagina (Tilesius) 8. Pegea confoederata (Forskal) Most of the specimens are preserved in formalin and these, especially the salpas, are all in a poor condition. In the salpas, most of the soft tissues, inclusive of muscle bands, has been lost as if the specimens had come from the stomach contents of fishes. Fortunately, however, the size, approximate outline, and situation of the nucleus could be determined, as well as those of the stolon. In some specimens, some traces of muscle bands were visible. All these features, together with test characters and the situation of the dorsal ganglion deducible from the anterior base of the gill, enabled me to identify most of them definitely. I want to express my cordial thanks to Dr. W. Vervoort of the Rijksmuseum van Natuurlijke Historie at Leiden for his generous help during my
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Tokioka, T. (1974). Biological results of the Snellius expedition. XXIV. Pelagic Tunicates of the Snellius expedition. Zoologische Mededelingen, 48(9), 75–80.