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Molecular Genetics and Genomics - 相似文献
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Dr. Rüdiger Felix Solla 《Plant Systematics and Evolution》1883,33(5):153-159
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Dr. Rüdiger Felix Solla 《Plant Systematics and Evolution》1883,33(6):185-193
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B. Werner 《Helgoland Marine Research》1974,26(3-4):434-463
The new solitary scyphopolypStephanoscyphus eumedusoides was detected in submarine caves of the rocky shore near Marseille (Mediterranean Sea), where it lives attached to colonies of corals at a depth of 2–3 m to 40–50 m. The new mode of development has been described briefly in an earlier paper in which the polyp was given the preliminary nameTesseroscyphus eumedusoides (Werner 1971a) but by a more detailed investigation it proved to belong to the genusStephanoscyphus. The essential characteristics of the peridermal tube and the soft body are outlined. Most of them are not sufficient to identify significantly the new species. Identification was possible by the observations on the new mode of development by sessile medusoids which is unique in the order Coronatae and the class Scyphozoa. The medusoids originate in the normal way by the process of strobilation. But other than in the known scyphozoan development by which free-swimming young medusae are produced, the medusoids remain connected with each other and the basal residue of the polyp's body within the peridermal tube. Development, morphology and anatomy of the medusoids are described. As they exhibit essential medusan characteristics they belong to the type of eumedusoid. On the other hand, there are remarkable signs of reduction due to progressive steps of evolution. The hermaphroditic medusoids become mature and reproduce within the polyp's tube. The fertilized eggs develop within the gastric cavity of the medusoids into free-swimming planulae which are released by the chain of degenerating and dying medusoids being pushed out of the tube by the regenerating polyp. After a planktonic period of several weeks, the planula attaches to a substratum in the normal way and undergoes development into the young polyp. This is described briefly. The cnidom of the polyp, the medusoid, and the planula consists of holotrichous haplonemes and heterotrichous microbasic euryteles. The vertical and horizontal distribution, and some details of the ecology are outlined according to the present state of knowledge. Because the new species has been collected and found only in submarine caves it is considered to be a true cave-living animal. Its diagnosis is given. 相似文献