Global mid-Cretaceous biogeography: A network-based approach

Investigating the spatial structure of the marine biodiversity has long been an important area of biological and palaeontological research.  Biogeographic studies on fossil organisms have contributed to our current understanding of the relationship between plate tectonics, Earth’s climate and the evolution of life. However, the impact of those studies extends beyond basic biogeographic questions to include, for example, conservation biology, regional geology, and stratigraphy. In this study we tested the traditional biogeographic scenario of the Albian Ammonoids using a network-based approach.

The fossil record of brachiopods in northern South America

During the last few years a series of studies on the modern and fossil brachiopods from Colombia have been carried out. The new data will help to elucidate the biogeographic history of the Andean region, the structure and palaeoecology of its marine communities. Brachiopod bioevents, including Hadrosia, Sellithyris, and hitherto unidentified taxa in the Lower Cretaceous strata of the Andean region may provide an opportunity for evaluating the partially contradictory ideas about the climatic conditions during Valanginian–Hauterivian times.

Biogeography of the Cretaceous brachiopods from Colombia

The Mesozoic fossil record of brachiopods in northern South America is relatively scarce and their
biogeographical history is not well understood. Cretaceous brachiopods in this region are restricted to
carbonate platforms of Colombia. We describe Sellithyris elizabetha nov. sp., a species showing morphological similarities with Valanginian species from the ancient Gulf of Mexico. Using a semi-quantitative taphonomic analysis, we identified a largescale erosional hiatus in the biochronology of some Valanginian sediments from Colombia.

Caribbean Brachiopods from Colombia

Modern ad fossil brachiopod faunas from Colombia have not been studied extensively. This paper examines recent material collected from deep-water coral environments (90–250 m) located off the San Bernardo Archipelago. The studied material comprises four species, two of which are new records for Colombia: Terebratulina cailleti Crosse, 1865and Tichosina plicata Cooper, 1977. The genus Tichosina comprises twenty extant species occurring across the Caribbean.  The species Tichosina bullisi Cooper, 1977 and Tichosina dubia Cooper, 1977 were synonymized with Tichosina plicata Cooper, 1977.