Fossil Gasterosteiformes from the Lower Oligocene of Frauenweiler (Baden-Wurttemberg, Germany). 1. New information on the morphology and systematics of the genus Aeoliscus Jordan & Starks 1902. Palaeontologische Zeitschrift, 70(3-4), November 1996: 521-545. 523 [Zoological Record Volume 133]