Nannoceratopsis gracilis

Nannoceratopsis gracilis is a fossil dinoflagellate cyst from the Jurassic period (200 to 145 million years ago).

Dinoflagellates are microscopic single-celled algae. They are a key part of marine and non-marine phytoplankton in modern and ancient ecosystems. Since they photosynthesise, they are primary producers at the base of the food chain and play a major role in the CO2 cycle.

As part of their life cycle, they form very resistant organic-walled cysts. These are very well preserved in sedimentary rocks and are studied by micropalaeontologists.

Species detail

Nannoceratopsis belongs to one of the oldest groups of dinoflagellates that we know from the fossil record, which makes it important in the study of early dinoflagellate evolution.

This species is an excellent Jurassic dinoflagellate cyst example. It has a quite unusual but distinctive morphology that makes it easy to recognise. In fact Nannoceratopsis looks so different to other dinoflagellate cysts that an order has been created especially to incorporate its forms.

  • Body plan of Nannoceratopsis
    Morphology

    Discover the key morphological characteristics used to identify Nannoceratopsis and view a labelled body plan of the species.

  • Scanning electron microscope image of the left lateral view of Nannoceratopsis
    Evolution

    Learn why Nannoceratopsis is regarded as an unusual dinoflagellate cyst, and why its order has been suggested as the ancestor of modern Dinophysiales dinoflagellates.

  • Scanning electron microscope image of the ventral face of Nannoceratopsis
    Palaeoenvironment

    Find out about the wide range of environments that Nannoceratopsis is known from.

  • Scanning electron microscope image of the dorsal view of Nannoceratopsis
    Stratigraphic distribution

    Find out about the stratigraphic distribution of Nannoceratopsis gracilis and its genus.

  • Right lateral view of Nannoceratopsis gracilis.
    References

    Get reference material related to Nannoceratopsis.

Images

Nannoceratopsis gracilis

The fossil dinoflagellate cyst Nannoceratopsis gracilis has a very distinctive shape, as shown by these right and left side views.

Right lateral view of Nannoceratopsis gracilis

Right lateral view of Nannoceratopsis gracilis, showing the tabulation details of the sulcus.

Body plan of Nannoceratopsis

Body plan of Nannoceratopsis.

Scanning electron microscope image of the left lateral view of Nannoceratopsis

Scanning electron microscope image of the left lateral view of Nannoceratopsis. The arrow indicates the excystment opening (archaeopyle) within the cingulum.

Scanning electron microscope image of the epicyst of Nannoceratopsis

Scanning electron microscope image of the epicyst of Nannoceratopsis, showing minute plates arranged in a peridinialean pattern.

Scanning electron microscope image of the ventral face of Nannoceratopsis

Scanning electron microscope image of the ventral face of Nannoceratopsis.

Dorsal view of Nannoceratopsis

Scanning electron microscope image of the dorsal view of Nannoceratopsis.

Cingular archaeopyle in Nannoceratopsis

Cingular archaeopyle in Nannoceratopsis.