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Inhalt:
- Frank Holl: Vorwort / Prefacio
- Ottmar Ette: Entre mundos - vías de Alexander von Humboldt hacia la conciencia universal
- Eberhard Knobloch: Alexander von Humboldts Weltbild
- José Ángel Rodríguez: El culto a Humboldt en Venezuela
- Christian Durisch Acosta: Die Humboldt-Rezeption in Ecuador - ein kulturgeschichtlicher Beitrag zum ecuadorianischen Nationsbildungsprozess
- César W. Astuhuamán Gonzáles: Incas, Jívaros y la obra de Humboldt Vues des Cordillères
- José Enrique Covarrubias: La recepción de la figura y obra de Humboldt en México 1821-2000
- Helga von Kügelgen: Klassizismus und vergleichendes Sehen in den Vues des Cordillères
- Hector Pérez Brignoli: Alexander von Humboldt en Centroamérica y en el Río de la Plata
- Tobias Kraft und Katharina Einert: Das ganze Werk in einem Netz? Bibliographie online verfügbarer Alexander-von-Humboldt-Digitalisate
While analyzing the fossil diatom flora in one of the longest paleolimnological records (core PI-6) from Lake Peten-Itza, lowland Guatemala, we encountered Aulacoseira Thwaites, Cyclotella (Kutzing) and Discostella (Cleve & Grunow) Houk & Klee species appearing successively in the record. Among them, two new species that are assigned to the genus Cyclotella are described herein. Cyclotella petenensis sp. nov. is characterised by a coarse striation marked by a shadow line and a tangentially undulate central area with an arc of central fultoportulae. Cyclotella cassandrae sp. nov. has an elliptically shaped valve, coarse striae and a scattered ring of central fultoportulae in the central area. Classification and differences to similar taxa in the genus Cyclotella are discussed.