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What can Aganaster vertebrae tell about its ecology?статья
- Автор: Kokorin A.I.
- Сборник: Progress in Echinoderm Palaeobiology
- Серия: Cuadernos del Museo Geominero
- Том: 19
- Год издания: 2015
- Место издания: Instituto Geolуgico y Minero de Espaсa Madrid
- Первая страница: 83
- Последняя страница: 85
- Аннотация: Aganaster is a rather widespread Late Paleozoic brittle star, with occurrences in the USA, China and Europe. It is one of the first so-called modern-type Paleozoic ophiuroids. Despite its age, Aganaster has many features typically found in recent brittle stars, such as fused vertebrae and a disc which is completely covered by plates. The specific structure of Aganaster vertebrae and in particular its articulation surface morphology suggest that this brittle star was a slow-moving species; it possibly lived slightly burrowed in the sediment with the oral side facing down and the arms directed upward to intercept detritus in transport. It is interesting that a very similar mode of life is assumed for early stem-group ophiuroids with discrete ambulacra and petaloid-like rays, such as Stenaster. This similarity is surprising because the compact, fused, cylindrical vertebrae of Aganaster should give an advantage in mobility. In all probability, Aganaster has secondarily adopted such an ecological role at the cost of mobility.
- Добавил в систему: Кокорин Александр Игоревич